Outputs (181)

Hydrodynamical simulations of merging galaxy clusters: giant dark matter particle colliders, powered by gravity (2024)
Journal Article
Sirks, E. L., Harvey, D., Massey, R., Oman, K. A., Robertson, A., Frenk, C., …McCleary, J. (2024). Hydrodynamical simulations of merging galaxy clusters: giant dark matter particle colliders, powered by gravity. Monthly Notices of the Royal Astronomical Society, 530(3), 3160-3170. https://doi.org/10.1093/mnras/stae1012

Terrestrial particle accelerators collide charged particles, then watch the trajectory of outgoing debris – but they cannot manipulate dark matter. Fortunately, dark matter is the main component of galaxy clusters, which are continuously pulled toget... Read More about Hydrodynamical simulations of merging galaxy clusters: giant dark matter particle colliders, powered by gravity.

Euclid: Validation of the MontePython forecasting tools (2024)
Journal Article
Casas, S., Lesgourgues, J., Schöneberg, N., Sabarish, V. M., Rathmann, L., Doerenkamp, M., …Veropalumbo, A. (2024). Euclid: Validation of the MontePython forecasting tools. Astronomy & Astrophysics, 682, Article A90. https://doi.org/10.1051/0004-6361/202346772

Context. The Euclid mission of the European Space Agency will perform a survey of weak lensing cosmic shear and galaxy clustering in order to constrain cosmological models and fundamental physics. Aims. We expand and adjust the mock Euclid likelih... Read More about Euclid: Validation of the MontePython forecasting tools.

Weak gravitational lensing measurements of Abell 2744 using JWST and shear measurement algorithm pyRRG-JWST (2024)
Journal Article
Harvey, D. R., & Massey, R. (2024). Weak gravitational lensing measurements of Abell 2744 using JWST and shear measurement algorithm pyRRG-JWST. Monthly Notices of the Royal Astronomical Society, 529(2), 802-809. https://doi.org/10.1093/mnras/stae370

We update the publicly available weak lensing shear measurement algorithm pyRRG for the JWST, and apply it to UNCOVER DR1 imaging of galaxy cluster Abell 2744. At short wavelengths (⁠ m), shear measurements are consistent between independent observa... Read More about Weak gravitational lensing measurements of Abell 2744 using JWST and shear measurement algorithm pyRRG-JWST.

Scanning for dark matter subhaloes in Hubble Space Telescope imaging of 54 strong lenses (2023)
Journal Article
Nightingale, J. W., He, Q., Cao, X., Amvrosiadis, A., Etherington, A., Frenk, C. S., …Massey, R. (2024). Scanning for dark matter subhaloes in Hubble Space Telescope imaging of 54 strong lenses. Monthly Notices of the Royal Astronomical Society, 527(4), 10480-10506. https://doi.org/10.1093/mnras/stad3694

The cold dark matter (DM) model predicts that every galaxy contains thousands of DM subhaloes; almost all other DM models include a physical process that smooths away the subhaloes. The subhaloes are invisible, but could be detected via strong gravit... Read More about Scanning for dark matter subhaloes in Hubble Space Telescope imaging of 54 strong lenses.

Data Downloaded via Parachute from a NASA Super-Pressure Balloon (2023)
Journal Article
Sirks, E. L., Massey, R., Gill, A. S., Anderson, J., Benton, S. J., Brown, A. M., …Vassilakis, G. N. (2023). Data Downloaded via Parachute from a NASA Super-Pressure Balloon. Aerospace, 10(11), Article 960. https://doi.org/10.3390/aerospace10110960

In April 2023, the superBIT telescope was lifted to the Earth’s stratosphere by a helium-filled super-pressure balloon to acquire astronomical imaging from above (99.5% of) the Earth’s atmosphere. It was launched from New Zealand and then, for 40 day... Read More about Data Downloaded via Parachute from a NASA Super-Pressure Balloon.

A Recent Impact Origin of Saturn’s Rings and Mid-sized Moons (2023)
Journal Article
Teodoro, L. F. A., Kegerreis, J. A., Estrada, P. R., Ćuk, M., Eke, V. R., Cuzzi, J. N., …Sandnes, T. D. (2023). A Recent Impact Origin of Saturn’s Rings and Mid-sized Moons. Astrophysical Journal, 955(2), Article 137. https://doi.org/10.3847/1538-4357/acf4ed

We simulate the collision of precursor icy moons analogous to Dione and Rhea as a possible origin for Saturn's remarkably young rings. Such an event could have been triggered a few hundred million years ago by resonant instabilities in a previous sat... Read More about A Recent Impact Origin of Saturn’s Rings and Mid-sized Moons.

Lensing in the Blue. II. Estimating the Sensitivity of Stratospheric Balloons to Weak Gravitational Lensing (2023)
Journal Article
McCleary, J. E., Everett, S. W., Shaaban, M. M., Gill, A. S., Vassilakis, G. N., Huff, E. M., …Tam, S. I. (2023). Lensing in the Blue. II. Estimating the Sensitivity of Stratospheric Balloons to Weak Gravitational Lensing. Astronomical Journal, 166(3), https://doi.org/10.3847/1538-3881/ace7ca

The Superpressure Balloon-borne Imaging Telescope (SuperBIT) is a diffraction-limited, wide-field, 0.5 m, near-infrared to near-ultraviolet observatory designed to exploit the stratosphere's space-like conditions. SuperBIT's 2023 science flight will... Read More about Lensing in the Blue. II. Estimating the Sensitivity of Stratospheric Balloons to Weak Gravitational Lensing.

RXJ0437+00: constraining dark matter with exotic gravitational lenses (2023)
Journal Article
Lagattuta, D. J., Richard, J., Ebeling, H., Basto, Q., Cerny, C., Edge, A., …Massey, R. (2023). RXJ0437+00: constraining dark matter with exotic gravitational lenses. Monthly Notices of the Royal Astronomical Society, 522(1), 1091-1107. https://doi.org/10.1093/mnras/stad803

We present the first strong-gravitational-lensing analysis of the galaxy cluster RX J0437.1+0043 (RXJ0437; z = 0.285). Newly obtained, deep MUSE observations, Keck/MOSFIRE near-infrared spectroscopy, and Hubble Space Telescope SNAPshot imaging reveal... Read More about RXJ0437+00: constraining dark matter with exotic gravitational lenses.

Abell 1201: detection of an ultramassive black hole in a strong gravitational lens (2023)
Journal Article
Nightingale, J., Smith, R. J., He, Q., O’Riordan, C. M., Kegerreis, J. A., Amvrosiadis, A., …Massey, R. J. (2023). Abell 1201: detection of an ultramassive black hole in a strong gravitational lens. Monthly Notices of the Royal Astronomical Society, 521(3), 3298-3322. https://doi.org/10.1093/mnras/stad587

Supermassive black holes (SMBHs) are a key catalyst of galaxy formation and evolution, leading to an observed correlation between SMBH mass MBH and host galaxy velocity dispersion σe. Outside the local Universe, measurements of MBH are usually only p... Read More about Abell 1201: detection of an ultramassive black hole in a strong gravitational lens.

The PAU Survey and Euclid: Improving broadband photometric redshifts with multi-task learning (2023)
Journal Article
Cabayol, L., Eriksen, M., Carretero, J., Casas, R., Castander, F., Fernández, E., …Tramacere, A. (2023). The PAU Survey and Euclid: Improving broadband photometric redshifts with multi-task learning. Astronomy & Astrophysics, 671, Article A153. https://doi.org/10.1051/0004-6361/202245027

Current and future imaging surveys require photometric redshifts (photo-zs) to be estimated for millions of galaxies. Improving the photo-z quality is a major challenge but is needed to advance our understanding of cosmology. In this paper we explore... Read More about The PAU Survey and Euclid: Improving broadband photometric redshifts with multi-task learning.

Beyond the bulge–halo conspiracy? Density profiles of early-type galaxies from extended-source strong lensing (2023)
Journal Article
Etherington, A., Nightingale, J. W., Massey, R., Robertson, A., Cao, X., Amvrosiadis, A., …Li, R. (2023). Beyond the bulge–halo conspiracy? Density profiles of early-type galaxies from extended-source strong lensing. Monthly Notices of the Royal Astronomical Society, 521(4), 6005-6018. https://doi.org/10.1093/mnras/stad582

Observations suggest that the dark matter and stars in early-type galaxies ‘conspire’ to produce a surprisingly simple distribution of total mass, ρ(r) ∝ ρ−γ, with γ ≈ 2. We measure the distribution of mass in 48 early-type galaxies that gravitationa... Read More about Beyond the bulge–halo conspiracy? Density profiles of early-type galaxies from extended-source strong lensing.

On the gravitational lensing interpretation of three gravitational wave detections in the mass gap by LIGO and Virgo (2023)
Journal Article
Bianconi, M., Smith, G. P., Nicholl, M., Ryczanowski, D., Richard, J., Jauzac, M., …Ridley, E. (2023). On the gravitational lensing interpretation of three gravitational wave detections in the mass gap by LIGO and Virgo. Monthly Notices of the Royal Astronomical Society, 521(3), 3421-3430. https://doi.org/10.1093/mnras/stad673

We search for gravitational wave (GW) events from LIGO-Virgo’s third run that may have been affected by gravitational lensing. Gravitational lensing delays the arrival of GWs, and alters their amplitude – thus biasing the inferred progenitor masses.... Read More about On the gravitational lensing interpretation of three gravitational wave detections in the mass gap by LIGO and Virgo.

PyAutoGalaxy: Open-Source Multiwavelength Galaxy Structure & Morphology (2023)
Journal Article
Nightingale, J. W., Amvrosiadis, A., Hayes, R. G., He, Q., Etherington, A., Cao, X., …Robertson, A. (2023). PyAutoGalaxy: Open-Source Multiwavelength Galaxy Structure & Morphology. The Journal of Open Source Software, 8(81), Article 4475. https://doi.org/10.21105/joss.04475

Nearly a century ago, Edwin Hubble famously classified galaxies into three distinct groups: ellipticals, spirals and irregulars (Hubble, 1926). Today, by analysing millions of galaxies with advanced image processing techniques Astronomers have expand... Read More about PyAutoGalaxy: Open-Source Multiwavelength Galaxy Structure & Morphology.

Enabling discovery of gravitationally lensed explosive transients: a new method to build an all-sky watch list of groups and clusters of galaxies (2023)
Journal Article
Ryczanowski, D., Smith, G. P., Bianconi, M., McGee, S., Robertson, A., Massey, R., & Jauzac, M. (2023). Enabling discovery of gravitationally lensed explosive transients: a new method to build an all-sky watch list of groups and clusters of galaxies. Monthly Notices of the Royal Astronomical Society, 520(2), 2547-2557. https://doi.org/10.1093/mnras/stad231

Cross-referencing a watch list of galaxy groups and clusters with transient detections from real-time streams of wide-field survey data is a promising method for discovering gravitationally lensed explosive transients, including supernovae, kilonovae... Read More about Enabling discovery of gravitationally lensed explosive transients: a new method to build an all-sky watch list of groups and clusters of galaxies.

Discovering gravitationally lensed gravitational waves: predicted rates, candidate selection, and localization with the Vera Rubin Observatory (2023)
Journal Article
Smith, G. P., Robertson, A., Mahler, G., Nicholl, M., Ryczanowski, D., Bianconi, M., …Jauzac, M. (2023). Discovering gravitationally lensed gravitational waves: predicted rates, candidate selection, and localization with the Vera Rubin Observatory. Monthly Notices of the Royal Astronomical Society, 520(1), 702-721. https://doi.org/10.1093/mnras/stad140

Secure confirmation that a gravitational wave (GW) has been gravitationally lensed would bring together these two pillars of General Relativity for the first time. This breakthrough is challenging for many reasons, including: GW sky localization unce... Read More about Discovering gravitationally lensed gravitational waves: predicted rates, candidate selection, and localization with the Vera Rubin Observatory.

Testing strong lensing subhalo detection with a cosmological simulation (2022)
Journal Article
He, Q., Nightingale, J., Robertson, A., Amvrosiadis, A., Cole, S., Frenk, C. S., …Etherington, A. (2023). Testing strong lensing subhalo detection with a cosmological simulation. Monthly Notices of the Royal Astronomical Society, 518(1), 220-239. https://doi.org/10.1093/mnras/stac2779

Strong gravitational lensing offers a compelling test of the cold dark matter paradigm, as it allows for subhaloes with masses of ∼109 M⊙ and below to be detected. We test commonly-used techniques for detecting subhaloes superposed in images of stron... Read More about Testing strong lensing subhalo detection with a cosmological simulation.

The “External” Shears In Strong Lens Models (2022)
Journal Article
Nightingale, J. W., Etherington, A., & Massey, R. (2022). The “External” Shears In Strong Lens Models. Proceedings of the International Astronomical Union, 18(S381), 13-16. https://doi.org/10.1017/s1743921323003691

The distribution of mass in galaxy-scale strong gravitational lenses is often modelled as an elliptical power law plus ‘external shear’, which notionally accounts for line-of-sight galaxies and cosmic shear. We argue that it does not, using three lin... Read More about The “External” Shears In Strong Lens Models.

Automated galaxy-galaxy strong lens modelling: No lens left behind (2022)
Journal Article
Etherington, A., Nightingale, J. W., Massey, R., Cao, X., Robertson, A., Amorisco, N. C., …Tam, S. (2022). Automated galaxy-galaxy strong lens modelling: No lens left behind. Monthly Notices of the Royal Astronomical Society, 517(3), 3275-3302. https://doi.org/10.1093/mnras/stac2639

The distribution of dark and luminous matter can be mapped around galaxies that gravitationally lens background objects into arcs or Einstein rings. New surveys will soon observe hundreds of thousands of galaxy lenses, and current, labour-intensive a... Read More about Automated galaxy-galaxy strong lens modelling: No lens left behind.

Euclid preparation XX. The Complete Calibration of the Color–Redshift Relation survey: LBT observations and data releas (2022)
Journal Article
Saglia, R., De Nicola, S., Fabricius, M., Guglielmo, V., Snigula, J., Zöller, R., …Viel, M. (2022). Euclid preparation XX. The Complete Calibration of the Color–Redshift Relation survey: LBT observations and data releas. Astronomy & Astrophysics, 664, Article A196. https://doi.org/10.1051/0004-6361/202243604

The Complete Calibration of the Color–Redshift Relation survey (C3R2) is a spectroscopic program designed to empirically calibrate the galaxy color–redshift relation to the Euclid depth (IE = 24.5), a key ingredient for the success of Stage IV dark e... Read More about Euclid preparation XX. The Complete Calibration of the Color–Redshift Relation survey: LBT observations and data releas.

Pilot-WINGS: An extended MUSE view of the structure of Abell 370 (2022)
Journal Article
Lagattuta, D. J., Richard, J., Bauer, F. E., Cerny, C., Claeyssens, A., Guaita, L., …Weaver, J. R. (2022). Pilot-WINGS: An extended MUSE view of the structure of Abell 370. Monthly Notices of the Royal Astronomical Society, 514(1), 497-517. https://doi.org/10.1093/mnras/stac418

We investigate the strong-lensing cluster Abell 370 (A370) using a wide Integral Field Unit (IFU) spectroscopic mosaic from the Multi-Unit Spectroscopic Explorer (MUSE). IFU spectroscopy provides significant insight into the structure and mass conten... Read More about Pilot-WINGS: An extended MUSE view of the structure of Abell 370.

Dealing with density discontinuities in planetary SPH simulations (2022)
Journal Article
Ruiz-Bonilla, S., Borrow, J., Eke, V., Kegerreis, J., Massey, R., Sandnes, T., & Teodoro, L. (2022). Dealing with density discontinuities in planetary SPH simulations. Monthly Notices of the Royal Astronomical Society, 512(3), 4660-4668. https://doi.org/10.1093/mnras/stac857

Density discontinuities cannot be precisely modelled in standard formulations of smoothed particles hydrodynamics (SPH) because the density field is defined smoothly as a kernel-weighted sum of neighbouring particle masses. This is a problem when per... Read More about Dealing with density discontinuities in planetary SPH simulations.

Galaxy–galaxy strong lens perturbations: line-of-sight haloes versus lens subhaloes (2022)
Journal Article
He, Q., Li, R., Frenk, C. S., Nightingale, J., Cole, S., Amorisco, N. C., …Cao, X. (2022). Galaxy–galaxy strong lens perturbations: line-of-sight haloes versus lens subhaloes. Monthly Notices of the Royal Astronomical Society, 512(4), 5862-5873. https://doi.org/10.1093/mnras/stac759

We rederive the number density of intervening line-of-sight haloes relative to lens subhaloes in galaxy-galaxy strong lensing observations, where these perturbers can generate detectable image fluctuations. Previous studies have calculated the detect... Read More about Galaxy–galaxy strong lens perturbations: line-of-sight haloes versus lens subhaloes.

The effects of self-interacting dark matter on the stripping of galaxies that fall into clusters (2022)
Journal Article
Sirks, E. L., Oman, K. A., Robertson, A., Massey, R., & Frenk, C. (2022). The effects of self-interacting dark matter on the stripping of galaxies that fall into clusters. Monthly Notices of the Royal Astronomical Society, 511(4), 5927-5935. https://doi.org/10.1093/mnras/stac406

We use the Cluster-EAGLE (C-EAGLE) hydrodynamical simulations to investigate the effects of self-interacting dark matter (SIDM) on galaxies as they fall into clusters. We find that SIDM galaxies follow similar orbits to their cold dark matter (CDM) c... Read More about The effects of self-interacting dark matter on the stripping of galaxies that fall into clusters.

Euclid preparation XVII. Cosmic Dawn Survey: Spitzer Space Telescope observations of the Euclid deep fields and calibration fields (2022)
Journal Article
Moneti, A., McCracken, H., Shuntov, M., Kauffmann, O., Capak, P., Davidzon, I., …Hildebrandt, H. (2022). Euclid preparation XVII. Cosmic Dawn Survey: Spitzer Space Telescope observations of the Euclid deep fields and calibration fields. Astronomy & Astrophysics, 658, Article A126. https://doi.org/10.1051/0004-6361/202142361

We present a new infrared survey covering the three Euclid deep fields and four other Euclid calibration fields using Spitzer Space Telescope’s Infrared Array Camera (IRAC). We combined these new observations with all relevant IRAC archival data of t... Read More about Euclid preparation XVII. Cosmic Dawn Survey: Spitzer Space Telescope observations of the Euclid deep fields and calibration fields.

Weak gravitational lensing shear measurement with FPFS: analytical mitigation of noise bias and selection bias (2022)
Journal Article
Li, X., Li, Y., & Massey, R. (2022). Weak gravitational lensing shear measurement with FPFS: analytical mitigation of noise bias and selection bias. Monthly Notices of the Royal Astronomical Society, 511(4), 4850-4860. https://doi.org/10.1093/mnras/stac342

Dedicated ‘Stage IV’ observatories will soon observe the entire extragalactic sky, to measure the ‘cosmic shear’ distortion of galaxy shapes by weak gravitational lensing. To measure the apparent shapes of those galaxies, we present an improved versi... Read More about Weak gravitational lensing shear measurement with FPFS: analytical mitigation of noise bias and selection bias.

Systematic Errors Induced by the Elliptical Power-law model in Galaxy–Galaxy Strong Lens Modeling (2022)
Journal Article
Cao, X., Li, R., Nightingale, J., Massey, R., Robertson, A., Frenk, C. S., …Zhu, K. (2022). Systematic Errors Induced by the Elliptical Power-law model in Galaxy–Galaxy Strong Lens Modeling. Research in Astronomy and Astrophysics, 22(2), https://doi.org/10.1088/1674-4527/ac3f2b

The elliptical power-law (EPL) model of the mass in a galaxy is widely used in strong gravitational lensing analyses. However, the distribution of mass in real galaxies is more complex. We quantify the biases due to this model mismatch by simulating... Read More about Systematic Errors Induced by the Elliptical Power-law model in Galaxy–Galaxy Strong Lens Modeling.

Euclid preparation XIII. Forecasts for galaxy morphology with the Euclid Survey using deep generative models (2022)
Journal Article
Bretonnière, H., Huertas-Company, M., Boucaud, A., Lanusse, F., Jullo, E., Merlin, E., …Knapen, J. (2022). Euclid preparation XIII. Forecasts for galaxy morphology with the Euclid Survey using deep generative models. Astronomy & Astrophysics, 657, Article A90. https://doi.org/10.1051/0004-6361/202141393

We present a machine learning framework to simulate realistic galaxies for the Euclid Survey, producing more complex and realistic galaxies than the analytical simulations currently used in Euclid. The proposed method combines a control on galaxy sha... Read More about Euclid preparation XIII. Forecasts for galaxy morphology with the Euclid Survey using deep generative models.

A forward-modelling method to infer the dark matter particle mass from strong gravitational lenses (2022)
Journal Article
He, Q., Robertson, A., Nightingale, J., Cole, S., Frenk, C. S., Massey, R., …Etherington, A. (2022). A forward-modelling method to infer the dark matter particle mass from strong gravitational lenses. Monthly Notices of the Royal Astronomical Society, 511(2), 3046-3062. https://doi.org/10.1093/mnras/stac191

A fundamental prediction of the cold dark matter (CDM) model of structure formation is the existence of a vast population of dark matter haloes extending to subsolar masses. By contrast, other dark matter models, such as a warm thermal relic (WDM), p... Read More about A forward-modelling method to infer the dark matter particle mass from strong gravitational lenses.

Euclid: Forecasts from redshift-space distortions and the Alcock-Paczynski test with cosmic voids (2022)
Journal Article
Hamaus, N., Aubert, M., Pisani, A., Contarini, S., Verza, G., Cousinou, M. -., …Romelli, E. (2022). Euclid: Forecasts from redshift-space distortions and the Alcock-Paczynski test with cosmic voids. Astronomy & Astrophysics, 658, Article A20. https://doi.org/10.1051/0004-6361/202142073

Euclid is poised to survey galaxies across a cosmological volume of unprecedented size, providing observations of more than a billion objects distributed over a third of the full sky. Approximately 20 million of these galaxies will have their spectro... Read More about Euclid: Forecasts from redshift-space distortions and the Alcock-Paczynski test with cosmic voids.

Euclid preparation XV. Forecasting cosmological constraints for the Euclid and CMB joint analysis (2022)
Journal Article
Ilić, S., Aghanim, N., Baccigalupi, C., Bermejo-Climent, J., Fabbian, G., Legrand, L., …Zucca, E. (2022). Euclid preparation XV. Forecasting cosmological constraints for the Euclid and CMB joint analysis. Astronomy & Astrophysics, 657, Article A91. https://doi.org/10.1051/0004-6361/202141556

The combination and cross-correlation of the upcoming Euclid data with cosmic microwave background (CMB) measurements is a source of great expectation since it will provide the largest lever arm of epochs, ranging from recombination to structure form... Read More about Euclid preparation XV. Forecasting cosmological constraints for the Euclid and CMB joint analysis.

Halo concentration strengthens dark matter constraints in galaxy-galaxy strong lensing analyses (2021)
Journal Article
Amorisco, N. C., Nightingale, J., He, Q., Amvrosiadis, A., Cao, X., Cole, S., …Robertson, A. (2022). Halo concentration strengthens dark matter constraints in galaxy-galaxy strong lensing analyses. Monthly Notices of the Royal Astronomical Society, 510, 2464-2479. https://doi.org/10.1093/mnras/stab3527

A defining prediction of the cold dark matter cosmological model is the existence of a very large population of low-mass haloes. This population is absent in models in which the dark matter particle is warm (WDM). These alternatives can, in principle... Read More about Halo concentration strengthens dark matter constraints in galaxy-galaxy strong lensing analyses.

Euclid preparation: XII. Optimizing the photometric sample of the Euclid survey for galaxy clustering and galaxy-galaxy lensing analyses (2021)
Journal Article
Pocino, A., Tutusaus, I., Castander, F., Fosalba, P., Crocce, M., Porredon, A., …Zucca, E. (2021). Euclid preparation: XII. Optimizing the photometric sample of the Euclid survey for galaxy clustering and galaxy-galaxy lensing analyses. Astronomy & Astrophysics, 655, Article A44. https://doi.org/10.1051/0004-6361/202141061

Photometric redshifts (photo-zs) are one of the main ingredients in the analysis of cosmological probes. Their accuracy particularly affects the results of the analyses of galaxy clustering with photometrically selected galaxies (GCph) and weak lensi... Read More about Euclid preparation: XII. Optimizing the photometric sample of the Euclid survey for galaxy clustering and galaxy-galaxy lensing analyses.

Euclid: Constraining dark energy coupled to electromagnetism using astrophysical and laboratory data (2021)
Journal Article
Martinelli, M., Martins, C., Nesseris, S., Tutusaus, I., Blanchard, A., Camera, S., …Vassallo, T. (2021). Euclid: Constraining dark energy coupled to electromagnetism using astrophysical and laboratory data. Astronomy & Astrophysics, 654, Article A148. https://doi.org/10.1051/0004-6361/202141353

In physically realistic, scalar-field-based dynamical dark energy models (including, e.g., quintessence), one naturally expects the scalar field to couple to the rest of the model’s degrees of freedom. In particular, a coupling to the electromagnetic... Read More about Euclid: Constraining dark energy coupled to electromagnetism using astrophysical and laboratory data.

Euclid Preparation. XIV. The Complete Calibration of the Color-Redshift Relation (C3R2) Survey: Data Release 3 (2021)
Journal Article
Stanford, S., Masters, D., Darvish, B., Stern, D., Cohen, J., Capak, P., …Zucca, E. (2021). Euclid Preparation. XIV. The Complete Calibration of the Color-Redshift Relation (C3R2) Survey: Data Release 3. Astrophysical Journal Supplement, 256(1), Article 9. https://doi.org/10.3847/1538-4365/ac0833

The Complete Calibration of the Color–Redshift Relation (C3R2) survey is obtaining spectroscopic redshifts in order to map the relation between galaxy color and redshift to a depth of i ∼ 24.5 (AB). The primary goal is to enable sufficiently accurate... Read More about Euclid Preparation. XIV. The Complete Calibration of the Color-Redshift Relation (C3R2) Survey: Data Release 3.

Euclid : Effects of sample covariance on the number counts of galaxy clusters (2021)
Journal Article
Fumagalli, A., Saro, A., Borgani, S., Castro, T., Costanzi, M., Monaco, P., …Vassallo, T. (2021). Euclid : Effects of sample covariance on the number counts of galaxy clusters. Astronomy & Astrophysics, 652, Article A21. https://doi.org/10.1051/0004-6361/202140592

Aims. We investigate the contribution of shot-noise and sample variance to uncertainties in the cosmological parameter constraints inferred from cluster number counts, in the context of the Euclid survey. Methods. By analysing 1000 Euclid-like light... Read More about Euclid : Effects of sample covariance on the number counts of galaxy clusters.

Assessing the sources of reionization: a spectroscopic case study of a 30× lensed galaxy at z ∼ 5 with Lyα, C IV, Mg II, and [Ne III] (2021)
Journal Article
Witstok, J., Smit, R., Maiolino, R., Curti, M., Laporte, N., Massey, R., …Swinbank, M. (2021). Assessing the sources of reionization: a spectroscopic case study of a 30× lensed galaxy at z ∼ 5 with Lyα, C IV, Mg II, and [Ne III]. Monthly Notices of the Royal Astronomical Society, 508(2), 1686-1700. https://doi.org/10.1093/mnras/stab2591

We present a detailed spectroscopic analysis of a galaxy at z ≃ 4.88 that is, by chance, magnified ∼30× by gravitational lensing. Only three sources at z ≳ 5 are known with such high magnification. This particular source has been shown to exhibit wid... Read More about Assessing the sources of reionization: a spectroscopic case study of a 30× lensed galaxy at z ∼ 5 with Lyα, C IV, Mg II, and [Ne III].

Euclid preparation: IX. EuclidEmulator2 - power spectrum emulation with massive neutrinos and self-consistent dark energy perturbations (2021)
Journal Article
Collaboration, E., Knabenhans, M., Stadel, J., Potter, D., Dakin, J., Hannestad, S., …Zucca, E. (2021). Euclid preparation: IX. EuclidEmulator2 - power spectrum emulation with massive neutrinos and self-consistent dark energy perturbations. Monthly Notices of the Royal Astronomical Society, 505(2), 2840-2869. https://doi.org/10.1093/mnras/stab1366

We present a new, updated version of the EuclidEmulator (called EuclidEmulator2), a fast and accurate predictor for the nonlinear correction of the matter power spectrum. 2 per cent level accurate emulation is now supported in the eight-dimensional p... Read More about Euclid preparation: IX. EuclidEmulator2 - power spectrum emulation with massive neutrinos and self-consistent dark energy perturbations.

PyAutoLens: Open-Source Strong Gravitational Lensing (2021)
Journal Article
Nightingale, J., Hayes, R., Kelly, A., Amvrosiadis, A., Etherington, A., He, Q., …Robertson, A. (2021). PyAutoLens: Open-Source Strong Gravitational Lensing. The Journal of Open Source Software, 6(58), Article 2825. https://doi.org/10.21105/joss.02825

Strong gravitational lensing, which can make a background source galaxy appears multiple times due to its light rays being deflected by the mass of one or more foreground lens galaxies, provides astronomers with a powerful tool to study dark matter,... Read More about PyAutoLens: Open-Source Strong Gravitational Lensing.

The surprising accuracy of isothermal Jeans modelling of self-interacting dark matter density profiles (2020)
Journal Article
Robertson, A., Massey, R., Eke, V., Schaye, J., & Theuns, T. (2021). The surprising accuracy of isothermal Jeans modelling of self-interacting dark matter density profiles. Monthly Notices of the Royal Astronomical Society, 501(3), 4610-5634. https://doi.org/10.1093/mnras/staa3954

Recent claims of observational evidence for self-interacting dark matter (SIDM) have relied on a semi-analytic method for predicting the density profiles of galaxies and galaxy clusters containing SIDM. We present a thorough description of this metho... Read More about The surprising accuracy of isothermal Jeans modelling of self-interacting dark matter density profiles.

The effect of pre-impact spin on the Moon-forming collision (2020)
Journal Article
Ruiz-Bonilla, S., Eke, V., Kegerreis, J., Massey, R., & Teodoro, L. (2021). The effect of pre-impact spin on the Moon-forming collision. Monthly Notices of the Royal Astronomical Society, 500(3), 2861-2870. https://doi.org/10.1093/mnras/staa3385

We simulate the hypothesized collision between the proto-Earth and a Mars-sized impactor that created the Moon. Among the resulting debris disc in some impacts, we find a self-gravitating clump of material. It is roughly the mass of the Moon, contain... Read More about The effect of pre-impact spin on the Moon-forming collision.

Euclid: Forecast constraints on the cosmic distance duality relation with complementary external probes (2020)
Journal Article
Martinelli, M., Martins, C., Nesseris, S., Sapone, D., Tutusaus, I., Avgoustidis, A., …Zacchei, A. (2020). Euclid: Forecast constraints on the cosmic distance duality relation with complementary external probes. Astronomy & Astrophysics, 644, Article A80. https://doi.org/10.1051/0004-6361/202039078

Context. In metric theories of gravity with photon number conservation, the luminosity and angular diameter distances are related via the Etherington relation, also known as the distance duality relation (DDR). A violation of this relation would rule... Read More about Euclid: Forecast constraints on the cosmic distance duality relation with complementary external probes.

Euclid: Identification of asteroid streaks in simulated images using StreakDet software (2020)
Journal Article
Pöntinen, M., Granvik, M., Nucita, A., Conversi, L., Altieri, B., Auricchio, N., …Zoubian, J. (2020). Euclid: Identification of asteroid streaks in simulated images using StreakDet software. Astronomy & Astrophysics, 644, Article A35. https://doi.org/10.1051/0004-6361/202037765

Context. The ESA Euclid space telescope could observe up to 150 000 asteroids as a side product of its primary cosmological mission. Asteroids appear as trailed sources, that is streaks, in the images. Owing to the survey area of 15 000 square degree... Read More about Euclid: Identification of asteroid streaks in simulated images using StreakDet software.

Optical Night Sky Brightness Measurements from the Stratosphere (2020)
Journal Article
Gill, A., Benton, S. J., Brown, A. M., Clark, P., Damaren, C. J., Eifler, T., …Tam, S. (2020). Optical Night Sky Brightness Measurements from the Stratosphere. Astronomical Journal, 160(6), Article 266. https://doi.org/10.3847/1538-3881/abbffb

This paper presents optical night sky brightness measurements from the stratosphere using CCD images taken with the Super-pressure Balloon-borne Imaging Telescope (SuperBIT). The data used for estimating the backgrounds were obtained during three com... Read More about Optical Night Sky Brightness Measurements from the Stratosphere.

Euclid: The importance of galaxy clustering and weak lensing cross-correlations within the photometric Euclid survey (2020)
Journal Article
Tutusaus, I., Martinelli, M., Cardone, V., Camera, S., Yahia-Cherif, S., Casas, S., …Zoubian, J. (2020). Euclid: The importance of galaxy clustering and weak lensing cross-correlations within the photometric Euclid survey. Astronomy & Astrophysics, 643, Article A70. https://doi.org/10.1051/0004-6361/202038313

Context. The data from the Euclid mission will enable the measurement of the angular positions and weak lensing shapes of over a billion galaxies, with their photometric redshifts obtained together with ground-based observations. This large dataset,... Read More about Euclid: The importance of galaxy clustering and weak lensing cross-correlations within the photometric Euclid survey.

Euclid preparation: VIII. The Complete Calibration of the Colour–Redshift Relation survey: VLT/KMOS observations and data release (2020)
Journal Article
Guglielmo, V., Saglia, R., Castander, F., Galametz, A., Paltani, S., Bender, R., …Zucca, E. (2020). Euclid preparation: VIII. The Complete Calibration of the Colour–Redshift Relation survey: VLT/KMOS observations and data release. Astronomy & Astrophysics, 642, Article A192. https://doi.org/10.1051/0004-6361/202038334

The Complete Calibration of the Colour–Redshift Relation survey (C3R2) is a spectroscopic effort involving ESO and Keck facilities designed specifically to empirically calibrate the galaxy colour–redshift relation – P(z|C) to the Euclid depth (iAB =... Read More about Euclid preparation: VIII. The Complete Calibration of the Colour–Redshift Relation survey: VLT/KMOS observations and data release.

Euclid preparation: VII. Forecast validation for Euclid cosmological probes (2020)
Journal Article
Blanchard, A., Camera, S., Carbone, C., Cardone, V., Casas, S., Clesse, S., …Zucca, E. (2020). Euclid preparation: VII. Forecast validation for Euclid cosmological probes. Astronomy & Astrophysics, 642, Article A191. https://doi.org/10.1051/0004-6361/202038071

Aims. The Euclid space telescope will measure the shapes and redshifts of galaxies to reconstruct the expansion history of the Universe and the growth of cosmic structures. The estimation of the expected performance of the experiment, in terms of pre... Read More about Euclid preparation: VII. Forecast validation for Euclid cosmological probes.

Reconciling galaxy cluster shapes, measured by theorists vs observers (2020)
Journal Article
Harvey, D., Robertson, A., Tam, S., Jauzac, M., Massey, R., Rhodes, J., & McCarthy, I. G. (2021). Reconciling galaxy cluster shapes, measured by theorists vs observers. Monthly Notices of the Royal Astronomical Society, 500(2), 2627-2644. https://doi.org/10.1093/mnras/staa3193

If properly calibrated, the shapes of galaxy clusters can be used to investigate many physical processes: from feedback and quenching of star formation, to the nature of dark matter. Theorists frequently measure shapes using moments of inertia of sim... Read More about Reconciling galaxy cluster shapes, measured by theorists vs observers.

Atmospheric Erosion by Giant Impacts onto Terrestrial Planets: A Scaling Law for any Speed, Angle, Mass, and Density (2020)
Journal Article
Kegerreis, J., Eke, V., Catling, D., Massey, R., Teodoro, L., & Zahnle, K. (2020). Atmospheric Erosion by Giant Impacts onto Terrestrial Planets: A Scaling Law for any Speed, Angle, Mass, and Density. Astrophysical Journal Letters, 901(2), Article L31. https://doi.org/10.3847/2041-8213/abb5fb

We present a new scaling law to predict the loss of atmosphere from planetary collisions for any speed, angle, impactor mass, target mass, and body composition, in the regime of giant impacts onto broadly terrestrial planets with relatively thin atmo... Read More about Atmospheric Erosion by Giant Impacts onto Terrestrial Planets: A Scaling Law for any Speed, Angle, Mass, and Density.

Atmospheric Erosion by Giant Impacts onto Terrestrial Planets (2020)
Journal Article
Kegerreis, J., Eke, V., Massey, R., & Teodoro, L. (2020). Atmospheric Erosion by Giant Impacts onto Terrestrial Planets. Astrophysical Journal, 897(2), Article 161. https://doi.org/10.3847/1538-4357/ab9810

We examine the mechanisms by which the atmosphere can be eroded by giant impacts onto Earth-like planets with thin atmospheres, using 3D smoothed particle hydrodynamics simulations with sufficient resolution to directly model the fate of low-mass atm... Read More about Atmospheric Erosion by Giant Impacts onto Terrestrial Planets.

The distribution of dark matter and gas spanning 6 Mpc around the post-merger galaxy cluster MS 0451-03 (2020)
Journal Article
Tam, S., Jauzac, M., Massey, R., Harvey, D., Eckert, D., Ebeling, H., …Smith, G. (2020). The distribution of dark matter and gas spanning 6 Mpc around the post-merger galaxy cluster MS 0451-03. Monthly Notices of the Royal Astronomical Society, 496(3), 4032-4050. https://doi.org/10.1093/mnras/staa1828

Using the largest mosaic of Hubble Space Telescope images around a galaxy cluster, we map the distribution of dark matter throughout an ∼6 × 6 Mpc2 area centred on the cluster MS 0451−03 (z = 0.54, M200=1.65×1015M⊙⁠). Our joint strong- and weak-lensi... Read More about The distribution of dark matter and gas spanning 6 Mpc around the post-merger galaxy cluster MS 0451-03.

Euclid: Reconstruction of weak-lensing mass maps for non-Gaussianity studies (2020)
Journal Article
Pires, S., Vandenbussche, V., Kansal, V., Bender, R., Blot, L., Bonino, D., …Wang, Y. (2020). Euclid: Reconstruction of weak-lensing mass maps for non-Gaussianity studies. Astronomy & Astrophysics, 638, Article A141. https://doi.org/10.1051/0004-6361/201936865

Weak lensing, which is the deflection of light by matter along the line of sight, has proven to be an efficient method for constraining models of structure formation and reveal the nature of dark energy. So far, most weak-lensing studies have focused... Read More about Euclid: Reconstruction of weak-lensing mass maps for non-Gaussianity studies.

Validation of PSF Models for HST and Other Space-Based Observations (2020)
Journal Article
Gillis, B. R., Schrabback, T., Marggraf, O., Mandelbaum, R., Massey, R., Rhodes, J., & Taylor, A. (2020). Validation of PSF Models for HST and Other Space-Based Observations. Monthly Notices of the Royal Astronomical Society, 496(4), 5017-5038. https://doi.org/10.1093/mnras/staa1818

Forthcoming space-based observations will require high-quality point-spread function (PSF) models for weak gravitational lensing measurements. One approach to generating these models is using a wavefront model based on the known telescope optics. We... Read More about Validation of PSF Models for HST and Other Space-Based Observations.

Mapping dark matter and finding filaments: calibration of lensing analysis techniques on simulated data (2020)
Journal Article
Tam, S., Massey, R., Jauzac, M., & Robertson, A. (2020). Mapping dark matter and finding filaments: calibration of lensing analysis techniques on simulated data. Monthly Notices of the Royal Astronomical Society, 496(3), 3973-3990. https://doi.org/10.1093/mnras/staa1756

We quantify the performance of mass mapping techniques on mock imaging and gravitational lensing data of galaxy clusters. The optimum method depends upon the scientific goal. We assess measurements of clusters’ radial density profiles, departures fro... Read More about Mapping dark matter and finding filaments: calibration of lensing analysis techniques on simulated data.

Download by parachute: retrieval of assets from high altitude balloons (2020)
Journal Article
Sirks, E., Clark, P., Massey, R., Benton, S., Brown, A., Damaren, C., …Tam, S. (2020). Download by parachute: retrieval of assets from high altitude balloons. Journal of Instrumentation, 15(05), Article P05014. https://doi.org/10.1088/1748-0221/15/05/p05014

We present a publicly-available toolkit of flight-proven hardware and software to retrieve 5 TB of data or small physical samples from a stratospheric balloon platform. Before launch, a capsule is attached to the balloon, and rises with it. Upon remo... Read More about Download by parachute: retrieval of assets from high altitude balloons.

On building a cluster watch-list for identifying strongly lensed supernovae, gravitational waves and kilonovae (2020)
Journal Article
Ryczanowski, D., Smith, G. P., Bianconi, M., Massey, R., Robertson, A., & Jauzac, M. (2020). On building a cluster watch-list for identifying strongly lensed supernovae, gravitational waves and kilonovae. Monthly Notices of the Royal Astronomical Society, 495(2), 1666-1671. https://doi.org/10.1093/mnras/staa1274

Motivated by discovering strongly-lensed supernovae, gravitational waves, and kilonovae in the 2020s, we investigate whether to build a watch-list of clusters based on observed cluster properties (i.e. lens-plane selection) or on the detectability of... Read More about On building a cluster watch-list for identifying strongly lensed supernovae, gravitational waves and kilonovae.

Euclid: The reduced shear approximation and magnification bias for Stage IV cosmic shear experiments (2020)
Journal Article
Deshpande, A., Kitching, T., Cardone, V., Taylor, P., Casas, S., Camera, S., …Zoubian, J. (2020). Euclid: The reduced shear approximation and magnification bias for Stage IV cosmic shear experiments. Astronomy & Astrophysics, 636, Article A95. https://doi.org/10.1051/0004-6361/201937323

Context. Stage IV weak lensing experiments will offer more than an order of magnitude leap in precision. We must therefore ensure that our analyses remain accurate in this new era. Accordingly, previously ignored systematic effects must be addressed.... Read More about Euclid: The reduced shear approximation and magnification bias for Stage IV cosmic shear experiments.

Understanding the large inferred Einstein radii of observed low-mass galaxy clusters (2020)
Journal Article
Robertson, A., Massey, R., & Eke, V. (2020). Understanding the large inferred Einstein radii of observed low-mass galaxy clusters. Monthly Notices of the Royal Astronomical Society, 494(4), 4706-4712. https://doi.org/10.1093/mnras/staa1076

We assess a claim that observed galaxy clusters with mass ∼1014M⊙ are more centrally concentrated than predicted in lambda cold dark matter (ΛCDM). We generate mock strong gravitational lensing observations, taking the lenses from a cosmological hydr... Read More about Understanding the large inferred Einstein radii of observed low-mass galaxy clusters.

Euclid: Nonparametric point spread function field recovery through interpolation on a graph Laplacian (2020)
Journal Article
Schmitz, M., Starck, J., Ngole Mboula, F., Auricchio, N., Brinchmann, J., Vito Capobianco, R., …Zoubian, J. (2020). Euclid: Nonparametric point spread function field recovery through interpolation on a graph Laplacian. Astronomy & Astrophysics, 636, https://doi.org/10.1051/0004-6361/201936094

Context. Future weak lensing surveys, such as the Euclid mission, will attempt to measure the shapes of billions of galaxies in order to derive cosmological information. These surveys will attain very low levels of statistical error, and systematic e... Read More about Euclid: Nonparametric point spread function field recovery through interpolation on a graph Laplacian.

Euclid: the selection of quiescent and star-forming galaxies using observed colours (2020)
Journal Article
Zoubian, J., Wetzstein, M., Wang, Y., Valenziano, L., Toledo-Moreo, R., Tereno, I., …Bisigello, L. (2020). Euclid: the selection of quiescent and star-forming galaxies using observed colours. Monthly Notices of the Royal Astronomical Society, 494(2), 2337-2354. https://doi.org/10.1093/mnras/staa885

The Euclid mission will observe well over a billion galaxies out to z ∼ 6 and beyond. This will offer an unrivalled opportunity to investigate several key questions for understanding galaxy formation and evolution. The first step for many of these st... Read More about Euclid: the selection of quiescent and star-forming galaxies using observed colours.

The BUFFALO HST Survey (2020)
Journal Article
Steinhardt, C. L., Jauzac, M., Acebron, A., Atek, H., Capak, P., Davidzon, I., …Zitrin, A. (2020). The BUFFALO HST Survey. Astrophysical Journal Supplement, 247(2), Article 64. https://doi.org/10.3847/1538-4365/ab75ed

The Beyond Ultra-deep Frontier Fields and Legacy Observations (BUFFALO) is a 101 orbit + 101 parallel Cycle 25 Hubble Space Telescope (HST) Treasury program taking data from 2018 to 2020. BUFFALO will expand existing coverage of the Hubble Frontier F... Read More about The BUFFALO HST Survey.

Euclid preparation: VI. Verifying the performance of cosmic shear experiments (2020)
Journal Article
Paykari, P., Kitching, T., Hoekstra, H., Azzollini, R., Cardone, V., Cropper, M., …Zucca, E. (2020). Euclid preparation: VI. Verifying the performance of cosmic shear experiments. Astronomy & Astrophysics, 635, Article A139. https://doi.org/10.1051/0004-6361/201936980

Aims. Our aim is to quantify the impact of systematic effects on the inference of cosmological parameters from cosmic shear. Methods. We present an “end-to-end” approach that introduces sources of bias in a modelled weak lensing survey on a galaxy-by... Read More about Euclid preparation: VI. Verifying the performance of cosmic shear experiments.

Euclid preparation: VI. Verifying the performance of cosmic shear experiments [with erratum] (2020)
Journal Article
Paykari, P., Kitching, T., Hoekstra, H., Azzollini, R., Cardone, V., Cropper, M., …Zucca, E. (2020). Euclid preparation: VI. Verifying the performance of cosmic shear experiments [with erratum]. Astronomy & Astrophysics, 638(C2), Article A139. https://doi.org/10.1051/0004-6361/201936980e

Aims. Our aim is to quantify the impact of systematic effects on the inference of cosmological parameters from cosmic shear. Methods. We present an “end-to-end” approach that introduces sources of bias in a modelled weak lensing survey on a galaxy-by... Read More about Euclid preparation: VI. Verifying the performance of cosmic shear experiments [with erratum].

Robust diffraction-limited near-infrared-to-near-ultraviolet wide-field imaging from stratospheric balloon-borne platforms—Super-pressure Balloon-borne Imaging Telescope performance (2020)
Journal Article
Romualdez, L. J., Benton, S. J., Brown, A. M., Clark, P., Damaren, C. J., Eifler, T., …Tam, S. (2020). Robust diffraction-limited near-infrared-to-near-ultraviolet wide-field imaging from stratospheric balloon-borne platforms—Super-pressure Balloon-borne Imaging Telescope performance. Review of Scientific Instruments, 91(3), Article 034501. https://doi.org/10.1063/1.5139711

At a fraction of the total cost of an equivalent orbital mission, scientific balloon-borne platforms, operating above 99.7% of the Earth’s atmosphere, offer attractive, competitive, and effective observational capabilities—namely, space-like seeing,... Read More about Robust diffraction-limited near-infrared-to-near-ultraviolet wide-field imaging from stratospheric balloon-borne platforms—Super-pressure Balloon-borne Imaging Telescope performance.

Euclid preparation: V. Predicted yield of redshift 7 < z < 9 quasars from the wide survey (2019)
Journal Article
Barnett, R., Warren, S., Mortlock, D., Cuby, J., Conselice, C., Hewett, P., …Zucca, E. (2019). Euclid preparation: V. Predicted yield of redshift 7 < z < 9 quasars from the wide survey. Astronomy & Astrophysics, 631, Article A85. https://doi.org/10.1051/0004-6361/201936427

We provide predictions of the yield of 7 < z < 9 quasars from the Euclid wide survey, updating the calculation presented in the Euclid Red Book in several ways. We account for revisions to the Euclid near-infrared filter wavelengths; we adopt steeper... Read More about Euclid preparation: V. Predicted yield of redshift 7 < z < 9 quasars from the wide survey.

Precision Projector Laboratory: detector characterization with an astronomical emulation testbed (2019)
Journal Article
Shapiro, C., Smith, R., Huff, E., Plazas, A. A., Rhodes, J., Fucik, J., …Seshadri, S. (2019). Precision Projector Laboratory: detector characterization with an astronomical emulation testbed. Journal of Astronomical Telescopes, Instruments, and Systems, 5(4), Article 041503. https://doi.org/10.1117/1.jatis.5.4.041503

As astronomical observations from space benefit from improved sensitivity, the effectiveness of scientific programs is becoming limited by systematics that often originate in poorly understood image sensor behavior. Traditional, bottom-up detector ch... Read More about Precision Projector Laboratory: detector characterization with an astronomical emulation testbed.

Galaxy structure with strong gravitational lensing: decomposing the internal mass distribution of massive elliptical galaxies (2019)
Journal Article
Nightingale, J., Massey, R., Harvey, D., Cooper, A., Etherington, A., Tam, S., & Hayes, R. (2019). Galaxy structure with strong gravitational lensing: decomposing the internal mass distribution of massive elliptical galaxies. Monthly Notices of the Royal Astronomical Society, 489(2), 2049-2068. https://doi.org/10.1093/mnras/stz2220

We investigate how strong gravitational lensing can test contemporary models of massive elliptical (ME) galaxy formation, by combining a traditional decomposition of their visible stellar distribution with a lensing analysis of their mass distributio... Read More about Galaxy structure with strong gravitational lensing: decomposing the internal mass distribution of massive elliptical galaxies.

Observable tests of self-interacting dark matter in galaxy clusters: cosmological simulations with SIDM and baryons (2019)
Journal Article
Robertson, A., Harvey, D., Massey, R., Eke, V., McCarthy, I. G., Jauzac, M., …Schaye, J. (2019). Observable tests of self-interacting dark matter in galaxy clusters: cosmological simulations with SIDM and baryons. Monthly Notices of the Royal Astronomical Society, 488(3), 3646-3662. https://doi.org/10.1093/mnras/stz1815

We present BAHAMAS-SIDM, the first large-volume, (400 h−1 Mpc)3, cosmological simulations including both self-interacting dark matter (SIDM) and baryonic physics. These simulations are important for two primary reasons: 1) they include the effects of... Read More about Observable tests of self-interacting dark matter in galaxy clusters: cosmological simulations with SIDM and baryons.

Observable tests of self-interacting dark matter in galaxy clusters: BCG wobbles in a constant density core (2019)
Journal Article
Harvey, D., Robertson, A., Massey, R., & McCarthy, I. G. (2019). Observable tests of self-interacting dark matter in galaxy clusters: BCG wobbles in a constant density core. Monthly Notices of the Royal Astronomical Society, 488(2), 1572-1579. https://doi.org/10.1093/mnras/stz1816

Models of cold dark matter (CDM) predict that the distribution of dark matter in galaxy clusters should be cuspy, centrally concentrated. Constant density cores would be strong evidence for beyond CDM physics, such as self-interacting dark matter (SI... Read More about Observable tests of self-interacting dark matter in galaxy clusters: BCG wobbles in a constant density core.

Planetary Giant Impacts: Convergence of High-Resolution Simulations using Efficient Spherical Initial Conditions and SWIFT (2019)
Journal Article
Kegerreis, J., Eke, V., Gonnet, P., Korycansky, D., Massey, R., Schaller, M., & Teodoro, L. (2019). Planetary Giant Impacts: Convergence of High-Resolution Simulations using Efficient Spherical Initial Conditions and SWIFT. Monthly Notices of the Royal Astronomical Society, 487(4), 5029-5040. https://doi.org/10.1093/mnras/stz1606

We perform simulations of giant impacts onto the young Uranus using smoothed particle hydrodynamics (SPH) with over 100 million particles. This 100–1000 × improvement in particle number reveals that simulations with below 107 particles fail to conver... Read More about Planetary Giant Impacts: Convergence of High-Resolution Simulations using Efficient Spherical Initial Conditions and SWIFT.

An open source toolkit for the tracking, termination and recovery of high altitude balloon flights and payloads (2019)
Journal Article
Clark, P., Funk, M., Funk, B., Funk, T., Meadows, R., Brown, A., …Netterfield, C. (2019). An open source toolkit for the tracking, termination and recovery of high altitude balloon flights and payloads. Journal of Instrumentation, 14(04), Article P04003. https://doi.org/10.1088/1748-0221/14/04/p04003

We present an open source toolkit of flight-proven electronic devices which can be used to track, terminate and recover high altitude balloon flights and payloads. Comprising a beacon, pyrotechnic and non-pyrotechnic cut-down devices plus associated... Read More about An open source toolkit for the tracking, termination and recovery of high altitude balloon flights and payloads.

Intercontinental collaborative experience with abdominal, retroperitoneal and pelvic schwannomas (2019)
Journal Article
Monteiro De Barros, J., Hodson, J., Glasbey, J., Massey, R., Rintoul-Hoad, O., Chetan, M., …Heeres, B. (2019). Intercontinental collaborative experience with abdominal, retroperitoneal and pelvic schwannomas. British Journal of Surgery, 107(4), 452-563. https://doi.org/10.1002/bjs.11376

Background Schwannomas are rare tumours that pose a significant management challenge in the abdomen, retroperitoneum and pelvis. No data are available to inform management strategy. Methods A collaborative international cohort study, across specialis... Read More about Intercontinental collaborative experience with abdominal, retroperitoneal and pelvic schwannomas.

Exponential shapelets: basis functions for data analysis of isolated features (2019)
Journal Article
Bergé, J., Massey, R., Baghi, Q., & Touboul, P. (2019). Exponential shapelets: basis functions for data analysis of isolated features. Monthly Notices of the Royal Astronomical Society, 486(1), 544-559. https://doi.org/10.1093/mnras/stz787

We introduce one- and two-dimensional ‘exponential shapelets’: orthonormal basis functions that efficiently model isolated features in data. They are built from eigenfunctions of the quantum mechanical hydrogen atom, and inherit mathematics with eleg... Read More about Exponential shapelets: basis functions for data analysis of isolated features.

Deep and rapid observations of strong-lensing galaxy clusters within the sky localization of GW170814 (2019)
Journal Article
Smith, G., Bianconi, M., Jauzac, M., Richard, J., Robertson, A., Berry, C., …Veitch, J. (2019). Deep and rapid observations of strong-lensing galaxy clusters within the sky localization of GW170814. Monthly Notices of the Royal Astronomical Society, 485(4), 5180-5191. https://doi.org/10.1093/mnras/stz675

We present observations of two strong-lensing galaxy clusters located within the 90 per cent credible sky localization maps released following LIGO-Virgo’s discovery of the binary black hole (BH-BH) gravitational wave (GW) source GW170814. Our object... Read More about Deep and rapid observations of strong-lensing galaxy clusters within the sky localization of GW170814.

The core of the massive cluster merger MACS J0417.5-1154 as seen by VLT/MUSE (2018)
Journal Article
Jauzac, M., Mahler, G., Edge, A. C., Sharon, K., Gillman, S., Ebeling, H., …Salomé, P. (2018). The core of the massive cluster merger MACS J0417.5-1154 as seen by VLT/MUSE. Monthly Notices of the Royal Astronomical Society, 483(3), 3082-3097. https://doi.org/10.1093/mnras/sty3312

We present a multiwavelength analysis of the core of the massive galaxy cluster MACS J0417.5−1154 (⁠z = 0.441). Our analysis takes advantage of Very Large Telescope/Multi-Unit Spectroscopic Explorer observations which allow the spectroscopic confirma... Read More about The core of the massive cluster merger MACS J0417.5-1154 as seen by VLT/MUSE.

Grid Mapping the Northern Plains of Mars: Geomorphological, Radar, and Water‐Equivalent Hydrogen Results From Arcadia Plantia (2018)
Journal Article
Ramsdale, J. D., Balme, M. R., Gallagher, C., Conway, S. J., Smith, I. B., Hauber, E., …Wilson, J. T. (2019). Grid Mapping the Northern Plains of Mars: Geomorphological, Radar, and Water‐Equivalent Hydrogen Results From Arcadia Plantia. Journal of Geophysical Research: Planets, 124(2), 504-527. https://doi.org/10.1029/2018je005663

A project of mapping ice‐related landforms was undertaken to understand the role of subsurface ice in the northern plains. This work is the first continuous regional mapping from CTX (ConTeXt Camera, 6 m/pixel; Malin et al., 2007) imagery in Arcadia... Read More about Grid Mapping the Northern Plains of Mars: Geomorphological, Radar, and Water‐Equivalent Hydrogen Results From Arcadia Plantia.

Grid Mapping the Northern Plains of Mars: A New Overview of Recent Water‐ and Ice‐Related Landforms in Acidalia Planitia (2018)
Journal Article
Orgel, C., Hauber, E., Gasselt, S., Reiss, D., Johnsson, A., Ramsdale, J. D., …Teodoro, L. F. (2019). Grid Mapping the Northern Plains of Mars: A New Overview of Recent Water‐ and Ice‐Related Landforms in Acidalia Planitia. Journal of Geophysical Research: Planets, 124(2), 454-482. https://doi.org/10.1029/2018je005664

We used a grid‐mapping technique to analyze the distribution of 13 water‐ and ice‐related landforms in Acidalia Planitia as part of a joint effort to study the three main basins in the northern lowlands of Mars, that is, Acidalia, Utopia, and Arcadia... Read More about Grid Mapping the Northern Plains of Mars: A New Overview of Recent Water‐ and Ice‐Related Landforms in Acidalia Planitia.

Growing a ‘cosmic beast’: observations and simulations of MACS J0717.5+3745 (2018)
Journal Article
Jauzac, M., Eckert, D., Schaller, M., Schwinn, J., Massey, R., Bahé, Y., …Umetsu, K. (2018). Growing a ‘cosmic beast’: observations and simulations of MACS J0717.5+3745. Monthly Notices of the Royal Astronomical Society, 481(3), 2901-2917. https://doi.org/10.1093/mnras/sty2366

We present a gravitational lensing and X-ray analysis of a massive galaxy cluster and its surroundings. The core of MACS J0717.5+3745 (M(R < 1 Mpc) ∼ 2 × 1015 M, z = 0.54) is already known to contain four merging components. We show that this is surr... Read More about Growing a ‘cosmic beast’: observations and simulations of MACS J0717.5+3745.

Image Reconstruction Techniques in Neutron and Gamma-Ray Spectroscopy: Improving Lunar Prospector Data (2018)
Journal Article
Wilson, J., Lawrence, D., Peplowski, P., Cahill, J., Eke, V., Massey, R., & Teodoro, L. (2018). Image Reconstruction Techniques in Neutron and Gamma-Ray Spectroscopy: Improving Lunar Prospector Data. Journal of Geophysical Research: Planets, 123(7), 1804-1822. https://doi.org/10.1029/2018je005589

We present improved resolution maps of the Lunar Prospector Neutron Spectrometer thermal, epithermal, and fast neutron data and gamma ray spectrometer Th‐line fluxes via global application of pixon image reconstruction techniques. With the use of moc... Read More about Image Reconstruction Techniques in Neutron and Gamma-Ray Spectroscopy: Improving Lunar Prospector Data.

VIS: the visible imager for Euclid (2018)
Conference Proceeding
Cropper, M., Pottinger, S., Azzollini, R., Szafraniec, M., Awan, S., Mellier, Y., …Fazio, G. G. (2018). VIS: the visible imager for Euclid. In Space telescopes and instrumentation 2018 : optical, infrared, and millimeter wave. https://doi.org/10.1117/12.2315372

Euclid-VIS is the large format visible imager for the ESA Euclid space mission in their Cosmic Vision program, scheduled for launch in 2021. Together with the near infrared imaging within the NISP instrument, it forms the basis of the weak lensing me... Read More about VIS: the visible imager for Euclid.

Auto-tuned thermal control on stratospheric balloon experiments (2018)
Conference Proceeding
Redmond, S., Benton, S., Brown, A., Clark, P., Damaren, C., Eifler, T., …Tam, S. (2018). Auto-tuned thermal control on stratospheric balloon experiments. In H. K. Marshall, J. Spyromilio, & R. Gilmozzi (Eds.), Ground-based and Airborne Telescopes VII : 10–15 June 2018, Austin, Texas, United States ; proceedings. https://doi.org/10.1117/12.2312339

Balloon-borne experiments present unique thermal design challenges, which are a combination of those present for both space and ground experiments. Radiation and conduction are the predominant heat transfer mechanisms with convection effects being mi... Read More about Auto-tuned thermal control on stratospheric balloon experiments.

Overview, design, and flight results from SuperBIT: a high-resolution, wide-field, visible-to-near-UV balloon-borne astronomical telescope (2018)
Conference Proceeding
Romualdez, L., Benton, S., Brown, A., Clark, P., Damaren, C., Eifler, T., …Tam, S. (2018). Overview, design, and flight results from SuperBIT: a high-resolution, wide-field, visible-to-near-UV balloon-borne astronomical telescope. In H. Takami, C. J. Evans, & L. Simard (Eds.), Proceedings of SPIE, Ground-based and Airborne Instrumentation for Astronomy VII. https://doi.org/10.1117/12.2307754

Balloon-borne astronomy is a unique tool that allows for a level of image stability and significantly reduced atmospheric interference without the often prohibitive cost and long development time-scale that are characteristic of space-borne facility-... Read More about Overview, design, and flight results from SuperBIT: a high-resolution, wide-field, visible-to-near-UV balloon-borne astronomical telescope.

Quantifying the abundance of faint, low-redshift satellite galaxies in the COSMOS survey (2018)
Journal Article
Xi, C., Taylor, J., Massey, R., Rhodes, J., Koekemoer, A., & Salvato, M. (2018). Quantifying the abundance of faint, low-redshift satellite galaxies in the COSMOS survey. Monthly Notices of the Royal Astronomical Society, 478(4), 5336-5355. https://doi.org/10.1093/mnras/sty1333

Faint dwarf satellite galaxies are important as tracers of small-scale structure, but remain poorly characterized outside the Local Group, due to the difficulty of identifying them consistently at larger distances. We review a recently proposed metho... Read More about Quantifying the abundance of faint, low-redshift satellite galaxies in the COSMOS survey.

AutoLens: automated modeling of a strong lens's light, mass, and source (2018)
Journal Article
Nightingale, J., Dye, S., & Massey, R. (2018). AutoLens: automated modeling of a strong lens's light, mass, and source. Monthly Notices of the Royal Astronomical Society, 478(4), 4738-4784. https://doi.org/10.1093/mnras/sty1264

This work presents AutoLens, the first entirely automated modeling suite for the analysis of galaxy-scale strong gravitational lenses. AutoLens simultaneously models the lens galaxy’s light and mass whilst reconstructing the extended source galaxy on... Read More about AutoLens: automated modeling of a strong lens's light, mass, and source.

Dark matter dynamics in Abell 3827: new data consistent with standard cold dark matter (2018)
Journal Article
Massey, R., Harvey, D., Liesenborgs, J., Richard, J., Stach, S., Swinbank, M., …Tittley, E. (2018). Dark matter dynamics in Abell 3827: new data consistent with standard cold dark matter. Monthly Notices of the Royal Astronomical Society, 477(1), 669-677. https://doi.org/10.1093/mnras/sty630

We present integral field spectroscopy of galaxy cluster Abell 3827, using Atacama Large Millimetre Array (ALMA) and Very Large Telescope/Multi-Unit Spectroscopic Explorer. It reveals an unusual configuration of strong gravitational lensing in the cl... Read More about Dark matter dynamics in Abell 3827: new data consistent with standard cold dark matter.

Cosmology and fundamental physics with the Euclid satellite (2018)
Journal Article
Amendola, L., Appleby, S., Avgoustidis, A., Bacon, D., Baker, T., Baldi, M., …Zlosnik, T. (2018). Cosmology and fundamental physics with the Euclid satellite. Living Reviews in Relativity, 21, https://doi.org/10.1007/s41114-017-0010-3

Euclid is a European Space Agency medium-class mission selected for launch in 2020 within the cosmic vision 2015–2025 program. The main goal of Euclid is to understand the origin of the accelerated expansion of the universe. Euclid will explore the e... Read More about Cosmology and fundamental physics with the Euclid satellite.

The shape of galaxy dark matter halos in massive galaxy clusters: Insights from strong gravitational lensing (2018)
Journal Article
Jauzac, M., Harvey, D., & Massey, R. (2018). The shape of galaxy dark matter halos in massive galaxy clusters: Insights from strong gravitational lensing. Monthly Notices of the Royal Astronomical Society, 477(3), 4046-4051. https://doi.org/10.1093/mnras/sty909

We assess how much unused strong lensing information is available in the deep Hubble Space Telescope imaging and Very Large Telescope/Multi Unit Spectroscopic Explorer spectroscopy of the Frontier Field clusters. As a pilot study, we analyse galaxy c... Read More about The shape of galaxy dark matter halos in massive galaxy clusters: Insights from strong gravitational lensing.

What if LIGO's gravitational wave detections are strongly lensed by massive galaxy clusters? (2018)
Journal Article
Smith, G., Jauzac, M., Veitch, J., Farr, W., Massey, R., & Richard, J. (2018). What if LIGO's gravitational wave detections are strongly lensed by massive galaxy clusters?. Monthly Notices of the Royal Astronomical Society, 475(3), 3823-3828. https://doi.org/10.1093/mnras/sty031

Motivated by the preponderance of so-called ‘heavy black holes’ in the binary black hole (BBH) gravitational wave (GW) detections to date, and the role that gravitational lensing continues to play in discovering new galaxy populations, we explore the... Read More about What if LIGO's gravitational wave detections are strongly lensed by massive galaxy clusters?.

Scientific Synergy between LSST and Euclid (2017)
Journal Article
Rhodes, J., Nichol, R. C., Aubourg, É., Bean, R., Boutigny, D., Bremer, M. N., …Linden, A. V. D. (2017). Scientific Synergy between LSST and Euclid. Astrophysical Journal Supplement, 233(2), Article 21. https://doi.org/10.3847/1538-4365/aa96b0

Euclid and the Large Synoptic Survey Telescope (LSST) are poised to dramatically change the astronomy landscape early in the next decade. The combination of high-cadence, deep, wide-field optical photometry from LSST with high-resolution, wide-field... Read More about Scientific Synergy between LSST and Euclid.

Cluster mass calibration at high redshift: HST weak lensing analysis of 13 distant galaxy clusters from the South Pole Telescope Sunyaev-Zel'dovich Survey (2017)
Journal Article
Schrabback, T., Applegate, D., Dietrich, J., Hoekstra, H., Bocquet, S., Gonzalez, A., …Zenteno, A. (2018). Cluster mass calibration at high redshift: HST weak lensing analysis of 13 distant galaxy clusters from the South Pole Telescope Sunyaev-Zel'dovich Survey. Monthly Notices of the Royal Astronomical Society, 474(2), 2635-2678. https://doi.org/10.1093/mnras/stx2666

We present an HST/Advanced Camera for Surveys (ACS) weak gravitational lensing analysis of 13 massive high-redshift (zmedian = 0.88) galaxy clusters discovered in the South Pole Telescope (SPT) Sunyaev–Zel'dovich Survey. This study is part of a large... Read More about Cluster mass calibration at high redshift: HST weak lensing analysis of 13 distant galaxy clusters from the South Pole Telescope Sunyaev-Zel'dovich Survey.

Equatorial locations of water on Mars: Improved resolution maps based on Mars Odyssey Neutron Spectrometer data (2017)
Journal Article
Wilson, J. T., Eke, V. R., Massey, R. J., Elphic, R. C., Feldman, W. C., Maurice, S., & Teodoro, L. F. (2018). Equatorial locations of water on Mars: Improved resolution maps based on Mars Odyssey Neutron Spectrometer data. Icarus, 299, 148-160. https://doi.org/10.1016/j.icarus.2017.07.028

We present a map of the near subsurface hydrogen distribution on Mars, based on epithermal neutron data from the Mars Odyssey Neutron Spectrometer. The map’s spatial resolution is approximately improved two-fold via a new form of the pixon image reco... Read More about Equatorial locations of water on Mars: Improved resolution maps based on Mars Odyssey Neutron Spectrometer data.

A test for skewed distributions of dark matter, and a possible detection in galaxy cluster Abell 3827 (2017)
Journal Article
Taylor, P., Massey, R., Jauzac, M., Courbin, F., Harvey, D., Joseph, R., & Robertson, A. (2017). A test for skewed distributions of dark matter, and a possible detection in galaxy cluster Abell 3827. Monthly Notices of the Royal Astronomical Society, 468(4), 5004-5013. https://doi.org/10.1093/mnras/stx855

Simulations of self-interacting dark matter predict that dark matter should lag behind galaxies during a collision. If the interaction is mediated by a high-mass force carrier, the distribution of dark matter can also develop asymmetric dark matter t... Read More about A test for skewed distributions of dark matter, and a possible detection in galaxy cluster Abell 3827.

Erratum: How well can charge transfer inefficiency be corrected? A parameter sensitivity study for iterative correction (2017)
Journal Article
Israel, H., Massey, R., Prod'homme, T., Cropper, M., Cordes, O., Gow, J., …Verhoeve, P. (2017). Erratum: How well can charge transfer inefficiency be corrected? A parameter sensitivity study for iterative correction. Monthly Notices of the Royal Astronomical Society, 467(4), 4218-4219. https://doi.org/10.1093/mnras/stx270

The article ‘How well can charge transfer inefficiency be corrected? A parameter sensitivity study for iterative correction’ was published in MNRAS 453, 561 (2015). We identified several incorrectly placed decimal points in Table 1 of that article th... Read More about Erratum: How well can charge transfer inefficiency be corrected? A parameter sensitivity study for iterative correction.

A gravitationally boosted MUSE survey for emission-line galaxies at z ≳ 5 behind the massive cluster RCS 0224 (2017)
Journal Article
Smit, R., Swinbank, A., Massey, R., Richard, J., Smail, I., & Kneib, J. (2017). A gravitationally boosted MUSE survey for emission-line galaxies at z ≳ 5 behind the massive cluster RCS 0224. Monthly Notices of the Royal Astronomical Society, 476(3), 3306-3323. https://doi.org/10.1093/mnras/stx245

We present a Very Large Telescope/Multi Unit Spectroscopic Explorer (MUSE) survey of lensed high-redshift galaxies behind the z = 0.77 cluster RCS 0224−0002. We study the detailed internal properties of a highly magnified (μ ∼ 29) z = 4.88 galaxy see... Read More about A gravitationally boosted MUSE survey for emission-line galaxies at z ≳ 5 behind the massive cluster RCS 0224.

Cosmic particle colliders: simulations of self-interacting dark matter with anisotropic scattering (2017)
Journal Article
Robertson, A., Massey, R., & Eke, V. (2017). Cosmic particle colliders: simulations of self-interacting dark matter with anisotropic scattering. Monthly Notices of the Royal Astronomical Society, 467(4), 4719-4730. https://doi.org/10.1093/mnras/stx463

We investigate how self-interacting dark matter (SIDM) with anisotropic scattering affects the evolution of isolated dark matter haloes as well as systems with two colliding haloes. For isolated haloes, we find that the evolution can be adequately ca... Read More about Cosmic particle colliders: simulations of self-interacting dark matter with anisotropic scattering.

Abell 2744: too much substructure for ΛCDM? (2017)
Journal Article
Schwinn, J., Jauzac, M., Baugh, C., Bartelmann, M., Eckert, D., Harvey, D., …Massey, R. (2017). Abell 2744: too much substructure for ΛCDM?. Monthly Notices of the Royal Astronomical Society, 467(3), 2913-2923. https://doi.org/10.1093/mnras/stx277

The massive substructures found in Abell 2744 by Jauzac et al. present a challenge to the cold dark matter paradigm due to their number and proximity to the cluster centre. We use one of the biggest N-body simulations, the Millennium XXL, to investig... Read More about Abell 2744: too much substructure for ΛCDM?.

Problems using ratios of galaxy shape moments in requirements for weak lensing surveys (2017)
Journal Article
Israel, H., Kitching, T., Massey, R., & Cropper, M. (2017). Problems using ratios of galaxy shape moments in requirements for weak lensing surveys. Astronomy & Astrophysics, 598, Article A46. https://doi.org/10.1051/0004-6361/201628394

Context. The shapes of galaxies are typically quantified by ratios of their quadrupole moments. Knowledge of these ratios (i.e. their measured standard deviation) is commonly used to assess the efficiency of weak gravitational lensing surveys. For fa... Read More about Problems using ratios of galaxy shape moments in requirements for weak lensing surveys.

Thermal, Structural, and Optical Analysis of a Balloon-Based Imaging System (2017)
Journal Article
Borden, M., Lewis, D., Ochoa, H., Jones-Wilson, L., Susca, S., Porter, M., …Netterfield, B. (2017). Thermal, Structural, and Optical Analysis of a Balloon-Based Imaging System. Publications of the Astronomical Society of the Pacific, 129, Article 035001. https://doi.org/10.1088/1538-3873/129/973/035001

The Subarcsecond Telescope And BaLloon Experiment, STABLE, is the fine stage of a guidance system for a high-altitude ballooning platform designed to demonstrate subarcsecond pointing stability over one minute using relatively dim guide stars in the... Read More about Thermal, Structural, and Optical Analysis of a Balloon-Based Imaging System.

Looking for dark matter trails in colliding galaxy clusters (2016)
Journal Article
Harvey, D., Robertson, A., Massey, R., & Kneib, J. (2017). Looking for dark matter trails in colliding galaxy clusters. Monthly Notices of the Royal Astronomical Society, 464(4), 3991-3997. https://doi.org/10.1093/mnras/stw2671

If dark matter interacts, even weakly, via non-gravitational forces, simulations predict that it will be preferentially scattered towards the trailing edge of the halo during collisions between galaxy clusters. This will temporarily create a non-symm... Read More about Looking for dark matter trails in colliding galaxy clusters.

What does the Bullet Cluster tell us about self-interacting dark matter? (2016)
Journal Article
Robertson, A., Massey, R., & Eke, V. (2017). What does the Bullet Cluster tell us about self-interacting dark matter?. Monthly Notices of the Royal Astronomical Society, 465(1), 569-587. https://doi.org/10.1093/mnras/stw2670

We perform numerical simulations of the merging galaxy cluster 1E 0657−56 (the Bullet Cluster), including the effects of elastic dark matter scattering. In a similar manner to the stripping of gas by ram pressure, dark matter self-interactions would... Read More about What does the Bullet Cluster tell us about self-interacting dark matter?.

The Extraordinary Amount of Substructure in the Hubble Frontier Fields Cluster Abell 2744 (2016)
Journal Article
Jauzac, M., Eckert, D., Schwinn, J., Harvey, D., Baugh, C., Robertson, A., …Tchernin, C. (2016). The Extraordinary Amount of Substructure in the Hubble Frontier Fields Cluster Abell 2744. Monthly Notices of the Royal Astronomical Society, 463(4), 3876-3893. https://doi.org/10.1093/mnras/stw2251

We present a joint optical/X-ray analysis of the massive galaxy cluster Abell 2744 (z=0.308). Our strong- and weak-lensing analysis within the central region of the cluster, i.e., at R < 1 Mpc from the brightest cluster galaxy, reveals eight substruc... Read More about The Extraordinary Amount of Substructure in the Hubble Frontier Fields Cluster Abell 2744.

VIS: the visible imager for Euclid (2016)
Conference Proceeding
Cropper, M., Pottinger, S., Niemi, S., Azzollini, R., Denniston, J., Szafraniec, M., …Tong, E. C. (2016). VIS: the visible imager for Euclid. . https://doi.org/10.1117/12.2234739

Euclid-VIS is the large format visible imager for the ESA Euclid space mission in their Cosmic Vision program, scheduled for launch in 2020. Together with the near infrared imaging within the NISP instrument, it forms the basis of the weak lensing me... Read More about VIS: the visible imager for Euclid.

IDCS J1426.5+3508: Weak Lensing Analysis of a Massive Galaxy Cluster at z = 1.75 (2016)
Journal Article
Mo, W., Gonzalez, A., Jee, M., Massey, R., Rhodes, J., Brodwin, M., …Zeimann, G. (2016). IDCS J1426.5+3508: Weak Lensing Analysis of a Massive Galaxy Cluster at z = 1.75. Astrophysical Journal, 818(2), Article L25. https://doi.org/10.3847/2041-8205/818/2/l25

We present a weak lensing study of the galaxy cluster IDCS J1426.5+3508 at z = 1.75, which is the highest-redshift strong lensing cluster known and the most distant cluster for which a weak lensing analysis has been undertaken. Using F160W, F814W, an... Read More about IDCS J1426.5+3508: Weak Lensing Analysis of a Massive Galaxy Cluster at z = 1.75.

Hubble Frontier Fields: predictions for the return of SN Refsdal with the MUSE and GMOS spectrographs (2016)
Journal Article
Jauzac, M., Richard, J., Limousin, M., Knowles, K., Mahler, G., Smith, G., …Rexroth, M. (2016). Hubble Frontier Fields: predictions for the return of SN Refsdal with the MUSE and GMOS spectrographs. Monthly Notices of the Royal Astronomical Society, 457(2), 2029-2042. https://doi.org/10.1093/mnras/stw069

We present a high-precision mass model of the galaxy cluster MACS J1149.6+ 2223, based on a strong gravitational lensing analysis of Hubble Space Telescope Frontier Fields (HFF) imaging data and spectroscopic follow-up with Gemini/Gemini Multi-Object... Read More about Hubble Frontier Fields: predictions for the return of SN Refsdal with the MUSE and GMOS spectrographs.

Frontier Fields: Subaru Weak-Lensing Analysis of the Merging Galaxy Cluster A2744 (2016)
Journal Article
Medezinski, E., Umetsu, K., Okabe, N., Nonino, M., Molnar, S., Massey, R., …Merten, J. (2016). Frontier Fields: Subaru Weak-Lensing Analysis of the Merging Galaxy Cluster A2744. Astrophysical Journal, 817(1), Article 24. https://doi.org/10.3847/0004-637x/817/1/24

We present a weak-lensing analysis of the merging Frontier Fields (FF) cluster Abell 2744 using new Subaru/Suprime-Cam imaging. The wide-field lensing mass distribution reveals this cluster is comprised of four distinct substructures. Simultaneously... Read More about Frontier Fields: Subaru Weak-Lensing Analysis of the Merging Galaxy Cluster A2744.

Warm-hot baryons comprise 5-10 per cent of filaments in the cosmic web (2015)
Journal Article
Eckert, D., Jauzac, M., Shan, H., Kneib, J., Erben, T., Israel, H., …Tchernin, C. (2015). Warm-hot baryons comprise 5-10 per cent of filaments in the cosmic web. Nature, 528, 105-107. https://doi.org/10.1038/nature16058

Observations of the cosmic microwave background indicate that baryons account for 5 per cent of the Universe’s total energy content1. In the local Universe, the census of all observed baryons falls short of this estimate by a factor of two2, 3. Cosmo... Read More about Warm-hot baryons comprise 5-10 per cent of filaments in the cosmic web.

On scale-dependent cosmic shear systematic effects (2015)
Journal Article
Kitching, T., Taylor, A., Cropper, M., Hoekstra, H., Hood, R., Massey, R., & Niemi, S. (2016). On scale-dependent cosmic shear systematic effects. Monthly Notices of the Royal Astronomical Society, 455(3), 3319-3332. https://doi.org/10.1093/mnras/stv2523

In this paper, we investigate the impact that realistic scale-dependent systematic effects may have on cosmic shear tomography. We model spatially varying residual galaxy ellipticity and galaxy size variations in weak lensing measurements and propaga... Read More about On scale-dependent cosmic shear systematic effects.

Self-interacting dark matter scattering rates through cosmic time (2015)
Journal Article
Robertson, A., Massey, R., Eke, V., & Bower, R. (2015). Self-interacting dark matter scattering rates through cosmic time. Monthly Notices of the Royal Astronomical Society, 453(3), 2267-2276. https://doi.org/10.1093/mnras/stv1805

We estimate the rate of dark matter scattering in collapsed structures throughout the history of the Universe. If the scattering cross-section is velocity independent, then the canonical picture is correct that scatterings occur mainly at late times.... Read More about Self-interacting dark matter scattering rates through cosmic time.

How well can charge transfer inefficiency be corrected? A parameter sensitivity study for iterative correction (2015)
Journal Article
Israel, H., Massey, R., Prod'homme, T., Cropper, M., Cordes, O., Gow, J., …Verhoeve, P. (2015). How well can charge transfer inefficiency be corrected? A parameter sensitivity study for iterative correction. Monthly Notices of the Royal Astronomical Society, 453(1), 561-580. https://doi.org/10.1093/mnras/stv1660

Radiation damage to space-based charge-coupled device detectors creates defects which result in an increasing charge transfer inefficiency (CTI) that causes spurious image trailing. Most of the trailing can be corrected during post-processing, by mod... Read More about How well can charge transfer inefficiency be corrected? A parameter sensitivity study for iterative correction.

The offsets between galaxies and their dark matter in Λ cold dark matter (2015)
Journal Article
Schaller, M., Robertson, A., Massey, R., Bower, R. G., & Eke, V. R. (2015). The offsets between galaxies and their dark matter in Λ cold dark matter. Monthly Notices of the Royal Astronomical Society: Letters, 453(1), L58-L62. https://doi.org/10.1093/mnrasl/slv104

We use the ‘Evolution and Assembly of GaLaxies and their Environments’ (EAGLE) suite of hydrodynamical cosmological simulations to measure offsets between the centres of stellar and dark matter components of galaxies. We find that the vast majority (... Read More about The offsets between galaxies and their dark matter in Λ cold dark matter.

Hubble Frontier Fields: a high-precision strong-lensing analysis of the massive galaxy cluster Abell 2744 using ∼180 multiple images (2015)
Journal Article
Jauzac, M., Richard, J., Jullo, E., Clément, B., Limousin, M., Kneib, J., …Rexroth, M. (2015). Hubble Frontier Fields: a high-precision strong-lensing analysis of the massive galaxy cluster Abell 2744 using ∼180 multiple images. Monthly Notices of the Royal Astronomical Society, 452(2), 1437-1446. https://doi.org/10.1093/mnras/stv1402

We present a high-precision mass model of galaxy cluster Abell 2744, based on a strong gravitational-lensing analysis of the Hubble Space Telescope Frontier Fields (HFF) imaging data, which now include both Advanced Camera for Surveys and Wide Field... Read More about Hubble Frontier Fields: a high-precision strong-lensing analysis of the massive galaxy cluster Abell 2744 using ∼180 multiple images.

CLASH: The Concentration-Mass Relation of Galaxy Clusters (2015)
Journal Article
Merten, J., Meneghetti, M., Postman, M., Umetsu, K., Zitrin, A., Medezinski, E., …Zheng, W. (2015). CLASH: The Concentration-Mass Relation of Galaxy Clusters. Astrophysical Journal, 806(1), Article 4. https://doi.org/10.1088/0004-637x/806/1/4

We present a new determination of the concentration–mass (c–M) relation for galaxy clusters based on our comprehensive lensing analysis of 19 X-ray selected galaxy clusters from the Cluster Lensing and Supernova Survey with Hubble (CLASH). Our sample... Read More about CLASH: The Concentration-Mass Relation of Galaxy Clusters.

The behaviour of dark matter associated with four bright cluster galaxies in the 10 kpc core of Abell 3827 (2015)
Journal Article
Massey, R., Williams, L., Smit, R., Swinbank, M., Kitching, D., Harvey, D., …Tittley, E. (2015). The behaviour of dark matter associated with four bright cluster galaxies in the 10 kpc core of Abell 3827. Monthly Notices of the Royal Astronomical Society, 449(4), 3393-3406. https://doi.org/10.1093/mnras/stv467

Galaxy cluster Abell 3827 hosts the stellar remnants of four almost equally bright elliptical galaxies within a core of radius 10 kpc. Such corrugation of the stellar distribution is very rare, and suggests recent formation by several simultaneous me... Read More about The behaviour of dark matter associated with four bright cluster galaxies in the 10 kpc core of Abell 3827.

The nongravitational interactions of dark matter in colliding galaxy clusters (2015)
Journal Article
Harvey, D., Massey, R., Kitching, T., Taylor, A., & Tittley, E. (2015). The nongravitational interactions of dark matter in colliding galaxy clusters. Science, 347(6229), 1462-1465. https://doi.org/10.1126/science.1261381

Collisions between galaxy clusters provide a test of the nongravitational forces acting on dark matter. Dark matter’s lack of deceleration in the “bullet cluster” collision constrained its self-interaction cross section σDM/m < 1.25 square centimeter... Read More about The nongravitational interactions of dark matter in colliding galaxy clusters.

Reconciling Planck cluster counts and cosmology? Chandra/XMM instrumental calibration and hydrostatic mass bias (2015)
Journal Article
Israel, H., Schellenberger, G., Nevalainen, J., Massey, R., & Reiprich, T. (2015). Reconciling Planck cluster counts and cosmology? Chandra/XMM instrumental calibration and hydrostatic mass bias. Monthly Notices of the Royal Astronomical Society, 448(1), 814-821. https://doi.org/10.1093/mnras/stv038

The mass of galaxy clusters can be inferred from the temperature of their X-ray-emitting gas, TX. Their masses may be underestimated if it is assumed that the gas is in hydrostatic equilibrium, by an amount bhyd ∼ (20 ± 10) per cent suggested by simu... Read More about Reconciling Planck cluster counts and cosmology? Chandra/XMM instrumental calibration and hydrostatic mass bias.

The X-ray properties of weak-lensing-selected galaxy clusters (2015)
Journal Article
Giles, P., Maughan, B., Hamana, T., Miyazaki, S., Birkinshaw, M., Ellis, R., & Massey, R. (2015). The X-ray properties of weak-lensing-selected galaxy clusters. Monthly Notices of the Royal Astronomical Society, 447(4), 3044-3059. https://doi.org/10.1093/mnras/stu2679

We present the results of an X-ray follow-up campaign targeting 10 weak-lensing (WL)-selected galaxy clusters from a Subaru WL survey. Archival Chandra data exist for two of the clusters, and we obtain dedicated observations of the remaining eight. T... Read More about The X-ray properties of weak-lensing-selected galaxy clusters.

The dark matter haloes of moderate luminosity X-ray AGN as determined from weak gravitational lensing and host stellar masses (2015)
Journal Article
Leauthaud, A., Benson, A., Civano, F., Coil, A., Bundy, K., Massey, R., …Rhodes, J. (2015). The dark matter haloes of moderate luminosity X-ray AGN as determined from weak gravitational lensing and host stellar masses. Monthly Notices of the Royal Astronomical Society, 446(2), 1874-1888. https://doi.org/10.1093/mnras/stu2210

Understanding the relationship between galaxies hosting active galactic nuclei (AGN) and the dark matter haloes in which they reside is key to constraining how black hole fuelling is triggered and regulated. Previous efforts have relied on simple hal... Read More about The dark matter haloes of moderate luminosity X-ray AGN as determined from weak gravitational lensing and host stellar masses.

Evidence for explosive silicic volcanism on the Moon from the extended distribution of thorium near the Compton-Belkovich Volcanic Complex (2014)
Journal Article
Wilson, J., Eke, V., Massey, R., Elphic, R., Jolliff, B., Lawrence, D., …Teodoro, L. (2015). Evidence for explosive silicic volcanism on the Moon from the extended distribution of thorium near the Compton-Belkovich Volcanic Complex. Journal of Geophysical Research: Planets, 120(1), 92-108. https://doi.org/10.1002/2014je004719

We reconstruct the abundance of thorium near the Compton-Belkovich Volcanic Complex on the Moon, using data from the Lunar Prospector Gamma Ray Spectrometer. We enhance the resolution via a pixon image reconstruction technique and find that the thori... Read More about Evidence for explosive silicic volcanism on the Moon from the extended distribution of thorium near the Compton-Belkovich Volcanic Complex.

Image Analysis for Cosmology: Shape Measurement Challenge Review & Results from the Mapping Dark Matter Challenge (2014)
Journal Article
Kitching, T., Rhodes, J., Heymans, C., Massey, R., Liu, Q., Cobzarenco, M., …Yurgenson, S. (2015). Image Analysis for Cosmology: Shape Measurement Challenge Review & Results from the Mapping Dark Matter Challenge. Astronomy and computing, 10, 9-21. https://doi.org/10.1016/j.ascom.2014.12.004

In this paper we present results from the Mapping Dark Matter competition that expressed the weak lensing shape measurement task in its simplest form and as a result attracted over 700 submissions in 2 months and a factor of 3 improvement in shape me... Read More about Image Analysis for Cosmology: Shape Measurement Challenge Review & Results from the Mapping Dark Matter Challenge.

Hubble Frontier Fields : the geometry and dynamics of the massive galaxy cluster merger MACSJ0416.1−2403 (2014)
Journal Article
Jauzac, M., Jullo, E., Eckert, D., Ebeling, H., Richard, J., Limousin, M., …Rexroth, M. (2015). Hubble Frontier Fields : the geometry and dynamics of the massive galaxy cluster merger MACSJ0416.1−2403. Monthly Notices of the Royal Astronomical Society, 446(4), 4132-4147. https://doi.org/10.1093/mnras/stu2425

We use a joint optical/X-ray analysis to constrain the geometry and history of the ongoing merging event in the massive galaxy cluster MACSJ0416.1-2403 (z=0.397). Our investigation of cluster substructure rests primarily on a combined strong- and wea... Read More about Hubble Frontier Fields : the geometry and dynamics of the massive galaxy cluster merger MACSJ0416.1−2403.

Characterization of a Commercial, Front-Illuminated Interline Transfer CCD Camera for use as a Guide Camera on a Balloon-Borne Telescope (2014)
Journal Article
Clark, P., Massey, R., Chang, H., Galloway, M., Israel, H., Jones, L., …Susca, S. (2014). Characterization of a Commercial, Front-Illuminated Interline Transfer CCD Camera for use as a Guide Camera on a Balloon-Borne Telescope. Journal of Astronomical Instrumentation, 3(2), Article 1440003. https://doi.org/10.1142/s2251171714400030

We report results obtained during the characterization of a commercial front-illuminated progressive scan interline transfer CCD camera. We demonstrate that the unmodified camera operates successfully in temperature and pressure conditions (-40°C, 4... Read More about Characterization of a Commercial, Front-Illuminated Interline Transfer CCD Camera for use as a Guide Camera on a Balloon-Borne Telescope.

VIS: the visible imager for Euclid (2014)
Conference Proceeding
Cropper, M., Pottinger, S., Niemi, S., Denniston, J., Cole, R., Szafraniec, M., …Massey, R. (2014). VIS: the visible imager for Euclid. In Space telescopes and instrumentation 2014 : optical, infrared and millimeter wave. https://doi.org/10.1117/12.2055543

Euclid-VIS is the large format visible imager for the ESA Euclid space mission in their Cosmic Vision program, scheduled for launch in 2020. Together with the near infrared imaging within the NISP instrument, it forms the basis of the weak lensing me... Read More about VIS: the visible imager for Euclid.

Hubble Frontier Fields: a high-precision strong-lensing analysis of galaxy cluster MACSJ0416.1-2403 using ∼200 multiple images (2014)
Journal Article
Jauzac, M., Clément, B., Limousin, M., Richard, J., Jullo, E., Ebeling, H., …Rexroth, M. (2014). Hubble Frontier Fields: a high-precision strong-lensing analysis of galaxy cluster MACSJ0416.1-2403 using ∼200 multiple images. Monthly Notices of the Royal Astronomical Society, 443(2), 1549-1554. https://doi.org/10.1093/mnras/stu1355

We present a high-precision mass model of the galaxy cluster MACSJ0416.1-2403, based on a strong-gravitational-lensing analysis of the recently acquired Hubble Space Telescope Frontier Fields (HFF) imaging data. Taking advantage of the unprecedented... Read More about Hubble Frontier Fields: a high-precision strong-lensing analysis of galaxy cluster MACSJ0416.1-2403 using ∼200 multiple images.

On the cross-section of dark matter using substructure infall into galaxy clusters (2014)
Journal Article
Harvey, D., Tittley, E., Massey, R., Kitching, T., Taylor, A., Pike, S., …Nagai, D. (2014). On the cross-section of dark matter using substructure infall into galaxy clusters. Monthly Notices of the Royal Astronomical Society, 441(1), 404-416. https://doi.org/10.1093/mnras/stu337

We develop a statistical method to measure the interaction cross-section of dark matter, exploiting the continuous minor merger events in which small substructures fall into galaxy clusters. We find that by taking the ratio of the distances between t... Read More about On the cross-section of dark matter using substructure infall into galaxy clusters.

The third gravitational lensing accuracy testing (GREAT3) challenge handbook (2014)
Journal Article
Mandelbaum, R., Rowe, B., Bosch, J., Chang, C., Courbin, F., Gill, M., …Schrabback, T. (2014). The third gravitational lensing accuracy testing (GREAT3) challenge handbook. Astrophysical Journal Supplement, 212(1), Article 5. https://doi.org/10.1088/0067-0049/212/1/5

The GRavitational lEnsing Accuracy Testing 3 (GREAT3) challenge is the third in a series of image analysis challenges, with a goal of testing and facilitating the development of methods for analyzing astronomical images that will be used to measure w... Read More about The third gravitational lensing accuracy testing (GREAT3) challenge handbook.

The zCOSMOS redshift survey: evolution of the light in bulges and discs since z ~ 0.8 (2014)
Journal Article
Tasca, L., Tresse, L., Le Fèvre, O., Ilbert, O., Lilly, S., Zamorani, G., …Coppa, G. (2014). The zCOSMOS redshift survey: evolution of the light in bulges and discs since z ~ 0.8. Astronomy & Astrophysics, 564, Article L12. https://doi.org/10.1051/0004-6361/201423699

We studied the chronology of galactic bulge and disc formation by analysing the relative contributions of these components to the B-band rest-frame luminosity density at different epochs. We present the first estimate of the evolution of the fraction... Read More about The zCOSMOS redshift survey: evolution of the light in bulges and discs since z ~ 0.8.

The 400d Galaxy Cluster Survey weak lensing programme. III. Evidence for consistent WL and X-ray masses at z ≈ 0.5 (2014)
Journal Article
Israel, H., Reiprich, T., Erben, T., Massey, R., Sarazin, C., Schneider, P., & Vikhlinin, A. (2014). The 400d Galaxy Cluster Survey weak lensing programme. III. Evidence for consistent WL and X-ray masses at z ≈ 0.5. Astronomy & Astrophysics, 564, Article A129. https://doi.org/10.1051/0004-6361/201322870

Context. Scaling properties of galaxy cluster observables with cluster mass provide central insights into the processes shaping clusters. Calibrating proxies for cluster mass that are relatively cheap to observe will moreover be crucial to harvest th... Read More about The 400d Galaxy Cluster Survey weak lensing programme. III. Evidence for consistent WL and X-ray masses at z ≈ 0.5.

An improved model of charge transfer inefficiency and correction algorithm for the Hubble Space Telescope (2014)
Journal Article
Massey, R., Schrabback, T., Cordes, O., Marggraf, O., Israel, H., Miller, L., …Matias Niemi, S. (2014). An improved model of charge transfer inefficiency and correction algorithm for the Hubble Space Telescope. Monthly Notices of the Royal Astronomical Society, 439(1), 887-907. https://doi.org/10.1093/mnras/stu012

Charge-coupled device (CCD) detectors, widely used to obtain digital imaging, can be damaged by high energy radiation. Degraded images appear blurred, because of an effect known as Charge Transfer Inefficiency (CTI), which trails bright objects as th... Read More about An improved model of charge transfer inefficiency and correction algorithm for the Hubble Space Telescope.

Evolution of the Stellar-to-Dark Matter relation: separating star-forming and passive galaxies from z = 1 to 0 (2013)
Journal Article
Tinker, J., Leauthaud, A., Bundy, K., George, M., Behroozi, P., Massey, R., …Wechsler, R. (2013). Evolution of the Stellar-to-Dark Matter relation: separating star-forming and passive galaxies from z = 1 to 0. Astrophysical Journal, 778(2), Article 93. https://doi.org/10.1088/0004-637x/778/2/93

We use measurements of the stellar mass function, galaxy clustering, and galaxy-galaxy lensing within the COSMOS survey to constrain the stellar-to-halo mass relation (SHMR) of star forming and quiescent galaxies over the redshift range z = [0.2, 1.0... Read More about Evolution of the Stellar-to-Dark Matter relation: separating star-forming and passive galaxies from z = 1 to 0.

Weak lensing calibrated M-T scaling relation of galaxy groups in the COSMOS field (2013)
Journal Article
Kettula, K., Finoguenov, A., Massey, R., Rhodes, J., Hoekstra, H., Taylor, J., …Koekemoer, A. (2013). Weak lensing calibrated M-T scaling relation of galaxy groups in the COSMOS field. Astrophysical Journal, 778(1), Article 74. https://doi.org/10.1088/0004-637x/778/1/74

The scaling between X-ray observables and mass for galaxy clusters and groups is instrumental for cluster-based cosmology and an important probe for the thermodynamics of the intracluster gas. We calibrate a scaling relation between the weak lensing... Read More about Weak lensing calibrated M-T scaling relation of galaxy groups in the COSMOS field.

Flexion measurement in simulations of Hubble Space Telescope data (2013)
Journal Article
Rowe, B., Bacon, D., Massey, R., Heymans, C., Häußler, B., Taylor, A., …Mellier, Y. (2013). Flexion measurement in simulations of Hubble Space Telescope data. Monthly Notices of the Royal Astronomical Society, 435(1), 822-844. https://doi.org/10.1093/mnras/stt1353

We present a simulation analysis of weak gravitational lensing flexion and shear measurement using shapelet decomposition, and identify differences between flexion and shear measurement noise in deep survey data. Taking models of galaxies from the Hu... Read More about Flexion measurement in simulations of Hubble Space Telescope data.

Cosmology and Fundamental Physics with the Euclid Satellite (2013)
Journal Article
Amendola, L., Appleby, S., Bacon, D., Baker, T., Baldi, M., Bartolo, N., …Zlosnik, T. (2013). Cosmology and Fundamental Physics with the Euclid Satellite. Living Reviews in Relativity, 16, https://doi.org/10.12942/lrr-2013-6

Euclid is a European Space Agency medium-class mission selected for launch in 2019 within the Cosmic Vision 2015-2025 program. The main goal of Euclid is to understand the origin of the accelerated expansion of the universe. Euclid will explore the e... Read More about Cosmology and Fundamental Physics with the Euclid Satellite.

Dark matter astrometry: accuracy of subhalo positions for the measurement of self-interaction cross-sections (2013)
Journal Article
Harvey, D., Massey, R., Kitching, T., Taylor, A., Jullo, E., Kneib, J., …Marshall, P. (2013). Dark matter astrometry: accuracy of subhalo positions for the measurement of self-interaction cross-sections. Monthly Notices of the Royal Astronomical Society, 433(2), 1517-1528. https://doi.org/10.1093/mnras/stt819

Direct evidence for the existence of dark matter and measurements of its interaction cross-section have been provided by the physical offset between dark matter and intracluster gas in merging systems like the Bullet Cluster. Although a smaller signa... Read More about Dark matter astrometry: accuracy of subhalo positions for the measurement of self-interaction cross-sections.

Defining a weak lensing experiment in space (2013)
Journal Article
Cropper, M., Hoekstra, H., Kitching, T., Massey, R., Amiaux, J., Miller, L., …Scaramella, R. (2013). Defining a weak lensing experiment in space. Monthly Notices of the Royal Astronomical Society, 431(4), 3103-3126. https://doi.org/10.1093/mnras/stt384

This paper describes the definition of a typical next-generation space-based weak gravitational lensing experiment. We first adopt a set of top-level science requirements from the literature, based on the scale and depth of the galaxy sample, and the... Read More about Defining a weak lensing experiment in space.

Evolution of galaxies and their environments at z = 0.1-3 in COSMOS (2013)
Journal Article
Scoville, N., Arnouts, S., Aussel, H., Benson, A., Bongiorno, A., Bundy, K., …Yan, L. (2013). Evolution of galaxies and their environments at z = 0.1-3 in COSMOS. Astrophysical Journal Supplement, 206(1), Article 3. https://doi.org/10.1088/0067-0049/206/1/3

Large-scale structures (LSSs) out to z < 3.0 are measured in the Cosmic Evolution Survey (COSMOS) using extremely accurate photometric redshifts (photoz). The Ks -band-selected sample (from Ultra-Vista) is comprised of 155,954 galaxies. Two technique... Read More about Evolution of galaxies and their environments at z = 0.1-3 in COSMOS.

Image analysis for cosmology: results from the GREAT10 star challenge (2013)
Journal Article
Kitching, T., Rowe, B., Gill, M., Heymans, C., Massey, R., Witherick, D., …Xin, B. (2013). Image analysis for cosmology: results from the GREAT10 star challenge. Astrophysical Journal Supplement, 205(2), Article 12. https://doi.org/10.1088/0067-0049/205/2/12

We present the results from the first public blind point-spread function (PSF) reconstruction challenge, the GRavitational lEnsing Accuracy Testing 2010 (GREAT10) Star Challenge. Reconstruction of a spatially varying PSF, sparsely sampled by stars, a... Read More about Image analysis for cosmology: results from the GREAT10 star challenge.

Origins of weak lensing systematics, and requirements on future instrumentation (or knowledge of instrumentation) (2013)
Journal Article
Massey, R., Hoekstra, H., Kitching, T., Rhodes, J., Cropper, M., Amiaux, J., …Schrabback, T. (2013). Origins of weak lensing systematics, and requirements on future instrumentation (or knowledge of instrumentation). Monthly Notices of the Royal Astronomical Society, 429(1), 661-678. https://doi.org/10.1093/mnras/sts371

The first half of this paper explores the origin of systematic biases in the measurement of weak gravitational lensing. Compared to previous work, we expand the investigation of point spread function instability and fold in for the first time the eff... Read More about Origins of weak lensing systematics, and requirements on future instrumentation (or knowledge of instrumentation).

Extragalactic number counts at 100 μm, free from cosmic variance (2013)
Journal Article
Sibthorpe, B., Ivison, R., Massey, R., Roseboom, I., van der Werf, P., Matthews, B., & Greaves, J. (2013). Extragalactic number counts at 100 μm, free from cosmic variance. Monthly Notices of the Royal Astronomical Society: Letters, 428(1), L6-L10. https://doi.org/10.1093/mnrasl/sls002

We use data from the Disc Emission via a Bias-free Reconnaissance in the Infrared/Submillimetre (DEBRIS) survey, taken at 100 μm with the Photoconductor Array Camera and Spectrometer instrument on board the Herschel Space Observatory, to make a cosmi... Read More about Extragalactic number counts at 100 μm, free from cosmic variance.

A weak lensing mass reconstruction of the large-scale filament feeding the massive galaxy cluster MACS J0717.5+3745 (2012)
Journal Article
Jauzac, M., Jullo, E., Kneib, J., Ebeling, H., Leauthaud, A., Ma, C., …Richard, J. (2012). A weak lensing mass reconstruction of the large-scale filament feeding the massive galaxy cluster MACS J0717.5+3745. Monthly Notices of the Royal Astronomical Society, 426(4), 3369-3384. https://doi.org/10.1111/j.1365-2966.2012.21966.x

We report the first weak lensing detection of a large-scale filament funnelling matter on to the core of the massive galaxy cluster MACS J0717.5+3745. Our analysis is based on a mosaic of 18 multipassband images obtained with the Advanced Camera for... Read More about A weak lensing mass reconstruction of the large-scale filament feeding the massive galaxy cluster MACS J0717.5+3745.

Space-quality data from balloon-borne telescopes: The High Altitude Lensing Observatory (HALO) (2012)
Journal Article
Rhodes, J., Dobke, B., Booth, J., Massey, R., Liewer, K., Smith, R., …Wu, J. (2012). Space-quality data from balloon-borne telescopes: The High Altitude Lensing Observatory (HALO). Astroparticle Physics, 38, 31-40. https://doi.org/10.1016/j.astropartphys.2012.05.015

On dark peaks and missing mass : a weak-lensing mass reconstruction of the merging cluster system A520 (2012)
Journal Article
Clowe, D., Markevitch, M., Bradac, M., Gonzalez, A., Chung, S., Massey, R., & Zaritsky, D. (2012). On dark peaks and missing mass : a weak-lensing mass reconstruction of the merging cluster system A520. Astrophysical Journal, 758(2), Article 128. https://doi.org/10.1088/0004-637x/758/2/128

Merging clusters of galaxies are unique in their power to directly probe and place limits on the self-interaction cross-section of dark matter. Detailed observations of several merging clusters have shown the intracluster gas to be displaced from the... Read More about On dark peaks and missing mass : a weak-lensing mass reconstruction of the merging cluster system A520.

Galaxies in x-ray groups. II. A weak lensing study of halo centering (2012)
Journal Article
George, M., Leauthaud, A., Bundy, K., Finoguenov, A., Ma, C., Rykoff, E., …Mei, S. (2012). Galaxies in x-ray groups. II. A weak lensing study of halo centering. Astrophysical Journal, 757(1), Article 2. https://doi.org/10.1088/0004-637x/757/1/2

Locating the centers of dark matter halos is critical for understanding the mass profiles of halos, as well as the formation and evolution of the massive galaxies that they host. The task is observationally challenging because we cannot observe halos... Read More about Galaxies in x-ray groups. II. A weak lensing study of halo centering.

The correlated formation histories of massive galaxies and their dark matter halos (2012)
Journal Article
Tinker, J., George, M., Leauthaud, A., Bundy, K., Finoguenov, A., Massey, R., …Wechsler, R. (2012). The correlated formation histories of massive galaxies and their dark matter halos. Astrophysical Journal Letters, 755(1), Article L5. https://doi.org/10.1088/2041-8205/755/1/l5

Using observations in the COSMOS field, we report an intriguing correlation between the star formation activity of massive (~1011.4 M ☉) central galaxies, their stellar masses, and the large-scale (~10 Mpc) environments of their group-mass (~1013.6 M... Read More about The correlated formation histories of massive galaxies and their dark matter halos.

The COSMOS density field: a reconstruction using both weak lensing and galaxy distributions (2012)
Journal Article
Amara, A., Lilly, S., Kovac, K., Rhodes, J., Massey, R., Zamorani, G., …Welikala, N. (2012). The COSMOS density field: a reconstruction using both weak lensing and galaxy distributions. Monthly Notices of the Royal Astronomical Society, 424(1), 553-563. https://doi.org/10.1111/j.1365-2966.2012.21231.x

The COSMOS field has been the subject of a wide range of observations, with a number of studies focusing on reconstructing the 3D dark matter density field. Typically, these studies have focused on one given method or tracer. In this paper, we recons... Read More about The COSMOS density field: a reconstruction using both weak lensing and galaxy distributions.

Image analysis for cosmology : results from the GREAT10 galaxy challenge (2012)
Journal Article
Kitching, T., Balan, S., Bridle, S., Cantale, N., Courbin, F., Eifler, T., …Zuntz, J. (2012). Image analysis for cosmology : results from the GREAT10 galaxy challenge. Monthly Notices of the Royal Astronomical Society, 423(4), 3163-3208. https://doi.org/10.1111/j.1365-2966.2012.21095.x

In this paper, we present results from the weak-lensing shape measurement GRavitational lEnsing Accuracy Testing 2010 (GREAT10) Galaxy Challenge. This marks an order of magnitude step change in the level of scrutiny employed in weak-lensing shape mea... Read More about Image analysis for cosmology : results from the GREAT10 galaxy challenge.

COSMOS : stochastic bias from measurements of weak lensing and galaxy clustering (2012)
Journal Article
Jullo, E., Rhodes, J., Kiessling, A., Taylor, J., Massey, R., Berge, J., …Scoville, N. (2012). COSMOS : stochastic bias from measurements of weak lensing and galaxy clustering. Astrophysical Journal, 750(1), Article 37. https://doi.org/10.1088/0004-637x/750/1/37

In the theory of structure formation, galaxies are biased tracers of the underlying matter density field. The statistical relation between galaxy and matter density field is commonly referred to as galaxy bias. In this paper, we test the linear bias... Read More about COSMOS : stochastic bias from measurements of weak lensing and galaxy clustering.

Measuring the geometry of the universe from weak gravitational lensing behind galaxy groups in the HST COSMOS survey (2012)
Journal Article
Taylor, J., Massey, R., Leauthaud, A., George, M., Rhodes, J., Kitching, T., …Tanaka, M. (2012). Measuring the geometry of the universe from weak gravitational lensing behind galaxy groups in the HST COSMOS survey. Astrophysical Journal, 749(2), Article 127. https://doi.org/10.1088/0004-637x/749/2/127

Gravitational lensing can provide pure geometric tests of the structure of spacetime, for instance by determining empirically the angular diameter distance-redshift relation. This geometric test has been demonstrated several times using massive clust... Read More about Measuring the geometry of the universe from weak gravitational lensing behind galaxy groups in the HST COSMOS survey.

The impact of galaxy colour gradients on cosmic shear measurement (2012)
Journal Article
Voigt, L., Bridle, S., Amara, A., Cropper, M., Kitching, T., Massey, R., …Schrabback, T. (2012). The impact of galaxy colour gradients on cosmic shear measurement. Monthly Notices of the Royal Astronomical Society, 421(2), 1385-1398. https://doi.org/10.1111/j.1365-2966.2011.20395.x

Cosmic shear has been identified as the method with the most potential to constrain dark energy. To capitalize on this potential, it is necessary to measure galaxy shapes with great accuracy, which in turn requires a detailed model for the image blur... Read More about The impact of galaxy colour gradients on cosmic shear measurement.

Weak lensing measurement of galaxy clustering in the CFHTLS-Wide survey (2012)
Journal Article
Shan, H., Kneib, J., Tao, C., Fan, Z., Jauzac, M., Limousin, M., …McCracken, H. (2012). Weak lensing measurement of galaxy clustering in the CFHTLS-Wide survey. Astrophysical Journal, 748(1), Article 56. https://doi.org/10.1088/0004-637x/748/1/56

We present the first weak gravitational lensing analysis of the completed Canada-France-Hawaii Telescope Legacy Survey (CFHTLS). We study the 64 deg2 W1 field, the largest of the CFHTLS-Wide survey fields, and present the largest contiguous weak lens... Read More about Weak lensing measurement of galaxy clustering in the CFHTLS-Wide survey.

Precision simulation of ground-based lensing data using observations from space (2012)
Journal Article
Mandelbaum, R., Hirata, C., Leauthaud, A., Massey, R., & Rhodes, J. (2012). Precision simulation of ground-based lensing data using observations from space. Monthly Notices of the Royal Astronomical Society, 420(2), 1518-1540. https://doi.org/10.1111/j.1365-2966.2011.20138.x

Current and upcoming wide-field, ground-based, broad-band imaging surveys promise to address a wide range of outstanding problems in galaxy formation and cosmology. Several such uses of ground-based data, especially weak gravitational lensing, requir... Read More about Precision simulation of ground-based lensing data using observations from space.

A detection of weak-lensing magnification using galaxy sizes and magnitudes (2012)
Journal Article
Schmidt, F., Leauthaud, A., Massey, R., Rhodes, J., George, M., Koekemoer, A., …Tanaka, M. (2012). A detection of weak-lensing magnification using galaxy sizes and magnitudes. Astrophysical Journal Letters, 744(2), Article L22. https://doi.org/10.1088/2041-8205/744/2/l22

Weak lensing is commonly measured using shear through galaxy ellipticities or using the effect of magnification bias on galaxy number densities. Here, we report on the first detection of weak-lensing magnification with a new, independent technique us... Read More about A detection of weak-lensing magnification using galaxy sizes and magnitudes.

New constraints on the evolution of the stellar-to-dark matter connection : a combined analysis of galaxy-galaxy lensing, clustering, and stellar mass functions from z = 0.2 to z = 1 (2012)
Journal Article
Leauthaud, A., Tinker, J., Bundy, K., Behroozi, P., Massey, R., Rhodes, J., …Taylor, J. (2012). New constraints on the evolution of the stellar-to-dark matter connection : a combined analysis of galaxy-galaxy lensing, clustering, and stellar mass functions from z = 0.2 to z = 1. Astrophysical Journal, 744(2), Article 159. https://doi.org/10.1088/0004-637x/744/2/159

Using data from the COSMOS survey, we perform the first joint analysis of galaxy-galaxy weak lensing, galaxy spatial clustering, and galaxy number densities. Carefully accounting for sample variance and for scatter between stellar and halo mass, we m... Read More about New constraints on the evolution of the stellar-to-dark matter connection : a combined analysis of galaxy-galaxy lensing, clustering, and stellar mass functions from z = 0.2 to z = 1.

Creation of cosmic structure in the complex galaxy cluster merger Abell 2744 (2011)
Journal Article
Merten, J., Coe, D., Dupke, R., Massey, R., Zitrin, A., Cypriano, E., …Bregman, J. (2011). Creation of cosmic structure in the complex galaxy cluster merger Abell 2744. Monthly Notices of the Royal Astronomical Society, 417(1), 333-347. https://doi.org/10.1111/j.1365-2966.2011.19266.x

We present a detailed strong-lensing, weak-lensing and X-ray analysis of Abell 2744 (z= 0.308), one of the most actively merging galaxy clusters known. It appears to have unleashed ‘dark’, ‘ghost’, ‘bullet’ and ‘stripped’ substructures, each ∼1014 M⊙... Read More about Creation of cosmic structure in the complex galaxy cluster merger Abell 2744.

Gravitational Lensing Accuracy Testing 2010 (GREAT10) Challenge Handbook (2011)
Journal Article
Kitching, T., Amara, A., Gill, M., Harmeling, S., Heymans, C., Massey, R., …Wittman, D. (2011). Gravitational Lensing Accuracy Testing 2010 (GREAT10) Challenge Handbook. Annals of Applied Statistics, 5(3), 2231-2263. https://doi.org/10.1214/11-aoas484

GRavitational lEnsing Accuracy Testing 2010 (GREAT10) is a public image analysis challenge aimed at the development of algorithms to analyze astronomical images. Specifically, the challenge is to measure varying image distortions in the presence of a... Read More about Gravitational Lensing Accuracy Testing 2010 (GREAT10) Challenge Handbook.

Cluster bulleticity (2011)
Journal Article
Massey, R., Kitching, T., & Nagai, D. (2011). Cluster bulleticity. Monthly Notices of the Royal Astronomical Society, 413(3), 1709-1716. https://doi.org/10.1111/j.1365-2966.2011.18246.x

The unique properties of dark matter are revealed during collisions between clusters of galaxies, such as the bullet cluster (1E 0657−56) and baby bullet (MACS J0025−12). These systems provide evidence for an additional, invisible mass in the separat... Read More about Cluster bulleticity.

Using Faraday rotation to probe magnetohydrodynamic instabilities in intracluster media (2011)
Journal Article
Bogdanovic, T., Reynolds, C., & Massey, R. (2011). Using Faraday rotation to probe magnetohydrodynamic instabilities in intracluster media. Astrophysical Journal, 731(1), Article 7. https://doi.org/10.1088/0004-637x/731/1/7

It has recently been suggested that conduction-driven magnetohydrodynamic (MHD) instabilities may operate at all radii within an intracluster medium (ICM) and profoundly affect the structure of a cluster's magnetic field. Where MHD instabilities domi... Read More about Using Faraday rotation to probe magnetohydrodynamic instabilities in intracluster media.

Charge transfer inefficiency in the Hubble Space Telescope since Servicing Mission 4 (2010)
Journal Article
Massey, R. (2010). Charge transfer inefficiency in the Hubble Space Telescope since Servicing Mission 4. Monthly Notices of the Royal Astronomical Society: Letters, 409(1), L109-L113. https://doi.org/10.1111/j.1745-3933.2010.00959.x

We update a physically motivated model of radiation damage in the Hubble Space Telescope Advanced Camera for Surveys/Wide Field Channel, using data up to mid-2010. We find that charge transfer inefficiency increased dramatically before shuttle Servic... Read More about Charge transfer inefficiency in the Hubble Space Telescope since Servicing Mission 4.

Astronomical Image Simulation for Telescope and Survey Development (2010)
Journal Article
Dobke, B. M., Johnston, D. E., Massey, R., High, F. W., Ferry, M., Rhodes, J., & Vanderveld, R. A. (2010). Astronomical Image Simulation for Telescope and Survey Development. Publications of the Astronomical Society of the Pacific, 122(894), 947-954. https://doi.org/10.1086/656016

We present the simage software suite for the simulation of artificial extragalactic images, based empirically around real observations of the Hubble Ultra Deep Field. The simulations reproduce galaxies with realistic and complex morphologies via the... Read More about Astronomical Image Simulation for Telescope and Survey Development.

The dark matter of gravitational lensing (2010)
Journal Article
Massey, R., Kitching, T., & Richard, J. (2010). The dark matter of gravitational lensing. Reports on Progress in Physics, 73(8), Article 086901. https://doi.org/10.1088/0034-4885/73/8/086901

We review progress in understanding dark matter by astrophysics, and particularly via the effect of gravitational lensing. Evidences from many different directions now all imply that five sixths of the material content of the Universe is in this myst... Read More about The dark matter of gravitational lensing.

Results of the GREAT08 Challenge : an image analysis competition for cosmological lensing (2010)
Journal Article
Bridle, S., Balan, S., Bethge, M., Gentile, M., Harmeling, S., Heymans, C., …Wittman, D. (2010). Results of the GREAT08 Challenge : an image analysis competition for cosmological lensing. Monthly Notices of the Royal Astronomical Society, 405(3), 2044-2061. https://doi.org/10.1111/j.1365-2966.2010.16598.x

We present the results of the Gravitational LEnsing Accuracy Testing 2008 (GREAT08) Challenge, a blind analysis challenge to infer weak gravitational lensing shear distortions from images. The primary goal was to stimulate new ideas by presenting the... Read More about Results of the GREAT08 Challenge : an image analysis competition for cosmological lensing.

Pixel-based correction for Charge Transfer Inefficiency in the Hubble Space Telescope Advanced Camera for Surveys (2010)
Journal Article
Massey, R., Stoughton, C., Leauthaud, A., Rhodes, J., Koekemoer, A., Ellis, R., & Shaghoulian, E. (2010). Pixel-based correction for Charge Transfer Inefficiency in the Hubble Space Telescope Advanced Camera for Surveys. Monthly Notices of the Royal Astronomical Society, 401(1), 371-384. https://doi.org/10.1111/j.1365-2966.2009.15638.x

Charge Transfer Inefficiency (CTI) due to radiation damage above the Earth's atmosphere creates spurious trailing in Hubble Space Telescope (HST) images. Radiation damage also creates unrelated warm pixels – but these happen to be perfect for measuri... Read More about Pixel-based correction for Charge Transfer Inefficiency in the Hubble Space Telescope Advanced Camera for Surveys.

A weak lensing study of X-ray groups in the COSMOS survey : form and evolution of the mass-luminosity relation (2009)
Journal Article
Leauthaud, A., Finoguenov, A., Kneib, J., Taylor, J., Massey, R., Rhodes, J., …Wolk, M. (2010). A weak lensing study of X-ray groups in the COSMOS survey : form and evolution of the mass-luminosity relation. Astrophysical Journal, 709(1), 97-114. https://doi.org/10.1088/0004-637x/709/1/97

Measurements of X-ray scaling laws are critical for improving cosmological constraints derived with the halo mass function and for understanding the physical processes that govern the heating and cooling of the intracluster medium. In this paper, we... Read More about A weak lensing study of X-ray groups in the COSMOS survey : form and evolution of the mass-luminosity relation.

Stellar and total baryon mass fractions in groups and clusters since Redshift 1 (2009)
Journal Article
Giodini, S., Pierini, D., Finoguenov, A., Pratt, G., Boehringer, H., Leauthaud, A., …Collaboration, C. (2009). Stellar and total baryon mass fractions in groups and clusters since Redshift 1. Astrophysical Journal, 703(1), 982-993. https://doi.org/10.1088/0004-637x/703/1/982

We investigate if the discrepancy between estimates of the total baryon mass fraction obtained from observations of the cosmic microwave background (CMB) and of galaxy groups/clusters persists when a large sample of groups is considered. To this purp... Read More about Stellar and total baryon mass fractions in groups and clusters since Redshift 1.

90 years on - the 1919 eclipse expedition at Príncipe (2009)
Journal Article
Ellis, R., Ferreira, P. G., Massey, R., & Weszkalnys, G. (2009). 90 years on - the 1919 eclipse expedition at Príncipe. Astronomy and Geophysics, 50(4), 4.12-4.15. https://doi.org/10.1111/j.1468-4004.2009.50412.x

The first experiment to observationally confirm Einstein's General Theory of Relativity was carried out in May 1919, on a Royal Astronomical Society expedition to observe a total solar eclipse. Sir Arthur Eddington travelled to Príncipe, a small isla... Read More about 90 years on - the 1919 eclipse expedition at Príncipe.

On the contribution of large-scale structure to strong gravitational lensing (2009)
Journal Article
Faure, C., Kneib, J., Hilbert, S., Massey, R., Covone, G., Finoguenov, A., …Koekemoer, A. (2009). On the contribution of large-scale structure to strong gravitational lensing. Astrophysical Journal, 695(2), 1233-1243. https://doi.org/10.1088/0004-637x/695/2/1233

We study the correlation between the locations of galaxy-galaxy strong-lensing candidates and tracers of large-scale structure from both weak lensing (WL) or X-ray emission. The Cosmological Evolution Survey (COSMOS) is a unique data set, combining d... Read More about On the contribution of large-scale structure to strong gravitational lensing.

Handbook for the GREAT08 Challenge: An image analysis competition for cosmological lensing (2009)
Journal Article
Bridle, S., Shawe-Taylor, J., Amara, A., Applegate, D., Balan, S. T., Berge, J., …Wittman, D. (2009). Handbook for the GREAT08 Challenge: An image analysis competition for cosmological lensing. Annals of Applied Statistics, 3(1), 6-37. https://doi.org/10.1214/08-aoas222

The GRavitational lEnsing Accuracy Testing 2008 (GREAT08) Challenge focuses on a problem that is of crucial importance for future observations in cosmology. The shapes of distant galaxies can be used to determine the properties of dark energy and the... Read More about Handbook for the GREAT08 Challenge: An image analysis competition for cosmological lensing.

Revealing the properties of dark matter in the merging cluster MACS J0025.4-1222 (2008)
Journal Article
Bradač, M., Allen, S., Treu, T., Ebeling, H., Massey, R., Morris, R., …Applegate, D. (2008). Revealing the properties of dark matter in the merging cluster MACS J0025.4-1222. Astrophysical Journal, 687(2), 959-967. https://doi.org/10.1086/591246

We constrain the physical nature of dark matter using the newly identified massive merging galaxy cluster MACS J0025.4–1222. As was previously shown by the example of the Bullet Cluster (1E 0657–56), such systems are ideal laboratories for detecting... Read More about Revealing the properties of dark matter in the merging cluster MACS J0025.4-1222.

First catalog of strong lens candidates in the COSMOS field (2008)
Journal Article
Faure, C., Kneib, J., Covone, G., Tasca, L., Leauthaud, A., Capak, P., …Walcher, J. (2008). First catalog of strong lens candidates in the COSMOS field. Astrophysical Journal Supplement, 176(1), 19-38. https://doi.org/10.1086/526426

e present the first catalog of 67 strong galaxy-galaxy lens candidates discovered in the 1.64 deg2 Hubble Space Telescope COSMOS survey. Twenty of these systems display multiple images or strongly curved large arcs. Our initial search is performed by... Read More about First catalog of strong lens candidates in the COSMOS field.

Weak-lensing ellipticities in a strong-lensing regime (2008)
Journal Article
Massey, R., & Goldberg, D. (2008). Weak-lensing ellipticities in a strong-lensing regime. Astrophysical Journal Letters, 673(2), L111-L114. https://doi.org/10.1086/528791

It is now routine to measure the weak gravitational lensing shear signal from the mean ellipticity of distant galaxies. However, conversion between ellipticity and shear assumes local linearity of the lensing potential (i.e., that the spatial derivat... Read More about Weak-lensing ellipticities in a strong-lensing regime.

Weak gravitational shear and flexion with polar shapelets (2007)
Journal Article
Massey, R., Rowe, B., Refregier, A., Bacon, D., & Bergé, J. (2007). Weak gravitational shear and flexion with polar shapelets. Monthly Notices of the Royal Astronomical Society, 380(1), 229-245. https://doi.org/10.1111/j.1365-2966.2007.12072.x

We derive expressions, in terms of ‘polar shapelets’, for the image distortion operations associated with weak gravitational lensing. Shear causes galaxy shapes to become elongated, and is sensitive to the second derivative of the projected gravitati... Read More about Weak gravitational shear and flexion with polar shapelets.

Weak gravitational lensing with COSMOS: Galaxy selection and shape measurements (2007)
Journal Article
Leauthaud, A., Massey, R., Kneib, J., Rhodes, J., Johnston, D. E., Capak, P., …Van Waerbeke, L. (2007). Weak gravitational lensing with COSMOS: Galaxy selection and shape measurements. Astrophysical Journal Supplement, 172(1), 219-238. https://doi.org/10.1086/516598

With a primary goal of conducting precision weak-lensing measurements from space, the COSMOS survey has imaged the largest contiguous area observed by Hubble Space Telescope to date, using the Advanced Camera for Surveys (ACS). This is the first pape... Read More about Weak gravitational lensing with COSMOS: Galaxy selection and shape measurements.

COSMOS: Hubble Space Telescope Observations (2007)
Journal Article
Scoville, N., Abraham, R., Aussel, H., Barnes, J., Benson, A., Blain, A., …Yan, L. (2007). COSMOS: Hubble Space Telescope Observations. Astrophysical Journal Supplement, 172(1), 38-45. https://doi.org/10.1086/516580

The Cosmic Evolution Survey (COSMOS) was initiated with an extensive allocation (590 orbits in Cycles 12-13) using the Hubble Space Telescope (HST) for high-resolution imaging. Here we review the characteristics of the HST imaging with the Advanced C... Read More about COSMOS: Hubble Space Telescope Observations.

COSMOS: Three-dimensional weak lensing and the growth of structure (2007)
Journal Article
Massey, R., Rhodes, J., Leauthaud, A., Capak, P., Ellis, R., Koekemoer, A., …Van Waerbeke, L. (2007). COSMOS: Three-dimensional weak lensing and the growth of structure. Astrophysical Journal Supplement, 172(1), 239-253. https://doi.org/10.1086/516599

We present a three-dimensional cosmic shear analysis of the Hubble Space Telescope COSMOS survey, the largest ever optical imaging program performed in space. We have measured the shapes of galaxies for the telltale distortions caused by weak gravita... Read More about COSMOS: Three-dimensional weak lensing and the growth of structure.

The stability of the point-spread function of the advanced camera for surveys on the Hubble Space Telescope and implications for weak gravitational lensing (2007)
Journal Article
Rhodes, J. D., Massey, R. J., Albert, J., Collins, N., Ellis, R. S., Heymans, C., …Van Waerbeke, L. (2007). The stability of the point-spread function of the advanced camera for surveys on the Hubble Space Telescope and implications for weak gravitational lensing. Astrophysical Journal Supplement, 172(1), 203-218. https://doi.org/10.1086/516592

We examine the spatial and temporal stability of the Hubble Space Telescope's Advanced Camera for Surveys (ACS) Wide Field Camera (WFC) point-spread function (PSF) using the 2 deg2 COSMOS survey. This is important for studies of weak gravitational le... Read More about The stability of the point-spread function of the advanced camera for surveys on the Hubble Space Telescope and implications for weak gravitational lensing.

The shear testing programme 2 : Factors affecting high-precision weak-lensing analyses (2007)
Journal Article
Massey, R., Heymans, C., Bergé, J., Bernstein, G., Bridle, S., Clowe, D., …Van Waerbeke, L. (2007). The shear testing programme 2 : Factors affecting high-precision weak-lensing analyses. Monthly Notices of the Royal Astronomical Society, 376(1), 13-38. https://doi.org/10.1111/j.1365-2966.2006.11315.x

The Shear Testing Programme (STEP) is a collaborative project to improve the accuracy and reliability of weak-lensing measurement, in preparation for the next generation of wide-field surveys. We review 16 current and emerging shear-measurement metho... Read More about The shear testing programme 2 : Factors affecting high-precision weak-lensing analyses.

Dark matter maps reveal cosmic scaffolding (2007)
Journal Article
Massey, R., Rhodes, J., Ellis, R., Scoville, N., Leauthaud, A., Finoguenov, A., …Taylor, J. (2007). Dark matter maps reveal cosmic scaffolding. Nature, 445(7125), 286-290. https://doi.org/10.1038/nature05497

Ordinary baryonic particles (such as protons and neutrons) account for only one sixth of the total matter in the Universe. The remainder is a mysterious ‘dark matter’ component, which does not interact via electromagnetism and thus neither emits nor... Read More about Dark matter maps reveal cosmic scaffolding.

The Shear Testing Programme - I. Weak lensing analysis of simulated ground-based observations (2006)
Journal Article
Heymans, C., Van Waerbeke, L., Bacon, D., Berge, J., Bernstein, G., Bertin, E., …Wittman, D. (2006). The Shear Testing Programme - I. Weak lensing analysis of simulated ground-based observations. Monthly Notices of the Royal Astronomical Society, 368(3), 1323-1339. https://doi.org/10.1111/j.1365-2966.2006.10198.x

The Shear Testing Programme (STEP) is a collaborative project to improve the accuracy and reliability of all weak lensing measurements in preparation for the next generation of wide-field surveys. In this first STEP paper, we present the results of a... Read More about The Shear Testing Programme - I. Weak lensing analysis of simulated ground-based observations.

Polar shapelets (2005)
Journal Article
Massey, R., & Refregier, A. (2005). Polar shapelets. Monthly Notices of the Royal Astronomical Society, 363(1), 197-210. https://doi.org/10.1111/j.1365-2966.2005.09453.x

The shapelets method for image analysis is based upon the decomposition of localized objects into a series of orthogonal components with convenient mathematical properties. We extend the ‘Cartesian shapelet’ formalism from earlier work, and construct... Read More about Polar shapelets.

An enlarged cosmic shear survey with the William Herschel Telescope (2005)
Journal Article
Massey, R., Refregier, A., Bacon, D., Ellis, R., & Brown, M. (2005). An enlarged cosmic shear survey with the William Herschel Telescope. Monthly Notices of the Royal Astronomical Society, 359(4), 1277-1286. https://doi.org/10.1111/j.1365-2966.2005.09011.x

We report the results of a cosmic shear survey using the 4.2-m William Herschel Telescope on La Palma, to a depth of R = 25.8 (z ≈ 0.8), over 4 deg2. The shear correlation functions are measured on scales from 1 to 15 arcmin, and are used to constrai... Read More about An enlarged cosmic shear survey with the William Herschel Telescope.

Weak lensing from space. II. Dark matter mapping (2004)
Journal Article
Massey, R., Rhodes, J., Refregier, A., Albert, J., Bacon, D., Bernstein, G., …Taylor, A. (2004). Weak lensing from space. II. Dark matter mapping. Astronomical Journal, 127(6), 3089-3101. https://doi.org/10.1086/420985

We study the accuracy with which weak-lensing measurements could be made from a future space-based survey, predicting the subsequent precision of three-dimensional dark matter maps, projected two-dimensional dark matter maps, and mass-selected cluste... Read More about Weak lensing from space. II. Dark matter mapping.

Image simulation with shapelets (2004)
Journal Article
Massey, R., Refregier, A., Conselice, C., & Bacon, D. (2004). Image simulation with shapelets. Monthly Notices of the Royal Astronomical Society, 348(1), 214-226. https://doi.org/10.1111/j.1365-2966.2004.07353.x

We present a method to simulate deep sky images, including realistic galaxy morphologies and telescope characteristics. To achieve a wide diversity of simulated galaxy morphologies, we first use the shapelets formalism to parametrize the shapes of al... Read More about Image simulation with shapelets.

Overview of the SuperNova/Acceleration Probe (SNAP) (2002)
Conference Proceeding
Aldering, G., Akerlof, C., Amanullah, R., Astier, P., Barrelet, E., Bebek, C., …Wang, G. (2002). Overview of the SuperNova/Acceleration Probe (SNAP). In A. M. Dressler (Ed.), Future research direction and visions for astronomy : 25-26 August, 2002, Waikoloa, Hawaii, USA (146-157). https://doi.org/10.1117/12.456562

The SuperNova / Acceleration Probe (SNAP) is a space-based experiment to measure the expansion history of the Universe and study both its dark energy and the dark matter. The experiment is motivated by the startling discovery that the expansion of th... Read More about Overview of the SuperNova/Acceleration Probe (SNAP).