Outputs (12)

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.