All Outputs (239)

Inferring the Mass Content of Galaxy Clusters with Satellite Kinematics and Jeans Anisotropic Modeling (2024)
Journal Article
Shi, R., Wang, W., Li, Z., Zhu, L., Smith, A., Cole, S., Gao, H., Chen, X., Li, Q., & Han, J. (2024). Inferring the Mass Content of Galaxy Clusters with Satellite Kinematics and Jeans Anisotropic Modeling. The Astrophysical Journal, 973(2), Article 82. https://doi.org/10.3847/1538-4357/ad64cf

Satellite galaxies can be used to indicate the dynamic mass of galaxy groups and clusters. In this study, we apply the axisymmetric Jeans Anisotropic Multi-Gaussian Expansion (JAM) modeling to satellite galaxies in 28 galaxy clusters selected from th... Read More about Inferring the Mass Content of Galaxy Clusters with Satellite Kinematics and Jeans Anisotropic Modeling.

DESI Early Data Release Milky Way Survey value-added catalogue (2024)
Journal Article
Koposov, S. E., Allende Prieto, C., Cooper, A. P., Li, T. S., Beraldo e Silva, L., Kim, B., Carrillo, A., Dey, A., Manser, C. J., Nikakhtar, F., Riley, A. H., Rockosi, C., Valluri, M., Aguilar, J., Ahlen, S., Bailey, S., Blum, R., Brooks, D., Claybaugh, T., Cole, S., …Zhou, Z. (2024). DESI Early Data Release Milky Way Survey value-added catalogue. Monthly Notices of the Royal Astronomical Society, 533(1), 1012-1031. https://doi.org/10.1093/mnras/stae1842

Unveiling lens light complexity with a novel multi-Gaussian expansion approach for strong gravitational lensing (2024)
Journal Article
He, Q., Nightingale, J. W., Amvrosiadis, A., Robertson, A., Cole, S., Frenk, C. S., Massey, R., Li, R., Cao, X., Lange, S. C., & França, J. P. C. (2024). Unveiling lens light complexity with a novel multi-Gaussian expansion approach for strong gravitational lensing. Monthly Notices of the Royal Astronomical Society, 532(2), 2441-2462. https://doi.org/10.1093/mnras/stae1577

In a strong gravitational lensing system, the distorted light from a source is analysed to infer the properties of the lens. However, light emitted by the lens itself can contaminate the image of the source, introducing systematic errors in the analy... Read More about Unveiling lens light complexity with a novel multi-Gaussian expansion approach for strong gravitational lensing.

Generating mock galaxy catalogues for flux-limited samples like the DESI Bright Galaxy Survey (2024)
Journal Article
Smith, A., Grove, C., Cole, S., Norberg, P., Zarrouk, P., Yuan, S., Aguilar, J., Ahlen, S., Brooks, D., Claybaugh, T., de la Macorra, A., Doel, P., Forero-Romero, J. E., Gaztañaga, E., Gontcho, S. G. A., Hahn, C., Kehoe, R., Kremin, A., Levi, M. E., Manera, M., …Zhou, Z. (2024). Generating mock galaxy catalogues for flux-limited samples like the DESI Bright Galaxy Survey. Monthly Notices of the Royal Astronomical Society, 532(1), 903-919. https://doi.org/10.1093/mnras/stae1503

Accurate mock galaxy catalogues are crucial to validate analysis pipelines used to constrain dark energy models. We present a fast HOD-fitting method which we apply to the AbacusSummit simulations to create a set of mock catalogues for the DESI Brigh... Read More about Generating mock galaxy catalogues for flux-limited samples like the DESI Bright Galaxy Survey.

DESI complete calibration of the colour–redshift relation (DC3R2): results from early DESI data (2024)
Journal Article
McCullough, J., Gruen, D., Amon, A., Roodman, A., Masters, D., Raichoor, A., …DESI Collaboration. (2024). DESI complete calibration of the colour–redshift relation (DC3R2): results from early DESI data. Monthly Notices of the Royal Astronomical Society, 531(2), 2582-2602. https://doi.org/10.1093/mnras/stae1316

We present initial results from the Dark Energy Spectroscopic Instrument (DESI) complete calibration of the colour–redshift relation (DC3R2) secondary target survey. Our analysis uses 230 k galaxies that overlap with KiDS-VIKING ugriZYJHKs photometry... Read More about DESI complete calibration of the colour–redshift relation (DC3R2): results from early DESI data.

Strong gravitational lensing’s ‘external shear’ is not shear (2024)
Journal Article
Etherington, A., Nightingale, J., Massey, R., Tam, S.-I., Cao, X., Niemiec, A., He, Q., Robertson, A., Li, R., Amvrosiadis, A., Cole, S., Diego, J., Frenk, C., Frye, B., Harvey, D., Jauzac, M., Koekemoer, A., Lagattuta, D., Lange, S., Limousin, M., …Steinhardt, C. (2024). Strong gravitational lensing’s ‘external shear’ is not shear. Monthly Notices of the Royal Astronomical Society, 531(3), 3684-3697. https://doi.org/10.1093/mnras/stae1375

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 neighbouring galaxies and cosmic shear along our line of sight. A small amount of e... Read More about Strong gravitational lensing’s ‘external shear’ is not shear.

The DESI One-percent Survey: Evidence for Assembly Bias from Low-redshift Counts-in-cylinders Measurements (2024)
Journal Article
Pearl, A. N., Zentner, A. R., Newman, J. A., Bezanson, R., Wang, K., Moustakas, J., Aguilar, J. N., Ahlen, S., Brooks, D., Claybaugh, T., Cole, S., Dawson, K., de la Macorra, A., Doel, P., Forero-Romero, J. E., Gontcho A Gontcho, S., Honscheid, K., Landriau, M., Manera, M., Martini, P., …Zhou, Z. (2024). The DESI One-percent Survey: Evidence for Assembly Bias from Low-redshift Counts-in-cylinders Measurements. Astrophysical Journal, 963(2), Article 116. https://doi.org/10.3847/1538-4357/ad1ffd

We explore the galaxy-halo connection information that is available in low-redshift samples from the early data release of the Dark Energy Spectroscopic Instrument (DESI). We model the halo occupation distribution (HOD) from z = 0.1 to 0.3 using Surv... Read More about The DESI One-percent Survey: Evidence for Assembly Bias from Low-redshift Counts-in-cylinders Measurements.

PROVABGS: The Probabilistic Stellar Mass Function of the BGS One-percent Survey (2024)
Journal Article
Hahn, C., Aguilar, J. N., Alam, S., Ahlen, S., Brooks, D., Cole, S., …Zou, H. (2024). PROVABGS: The Probabilistic Stellar Mass Function of the BGS One-percent Survey. Astrophysical Journal, 963(1), Article 56. https://doi.org/10.3847/1538-4357/ad19c8

We present the probabilistic stellar mass function (pSMF) of galaxies in the DESI Bright Galaxy Survey (BGS), observed during the One-percent Survey. The One-percent Survey was one of DESI’s survey validation programs conducted from 2021 April to May... Read More about PROVABGS: The Probabilistic Stellar Mass Function of the BGS One-percent Survey.

The DESI One-Percent Survey: A Concise Model for the Galactic Conformity of Emission-line Galaxies (2024)
Journal Article
Gao, H., Jing, Y. P., Xu, K., Zhao, D., Gui, S., Zheng, Y., …Zhou, Z. (2024). The DESI One-Percent Survey: A Concise Model for the Galactic Conformity of Emission-line Galaxies. Astrophysical Journal, 961(1), Article 74. https://doi.org/10.3847/1538-4357/ad09d6

Galactic conformity is the phenomenon whereby a galaxy of a certain physical property is correlated with its neighbors of the same property, implying a possible causal relationship. The observed auto correlations of emission-line galaxies (ELGs) from... Read More about The DESI One-Percent Survey: A Concise Model for the Galactic Conformity of Emission-line Galaxies.

DESI mock challenge: constructing DESI galaxy catalogues based on FastPM simulations (2023)
Journal Article
Variu, A., Alam, S., Zhao, C., Chuang, C., Yu, Y., Forero-Sánchez, D., …Zhou, Z. (2024). DESI mock challenge: constructing DESI galaxy catalogues based on FastPM simulations. Monthly Notices of the Royal Astronomical Society, 527(4), 11539-11558. https://doi.org/10.1093/mnras/stad3742

Together with larger spectroscopic surveys such as the Dark Energy Spectroscopic Instrument (DESI), the precision of large scale structure studies and thus the constraints on the cosmological parameters are rapidly improving. Therefore, one must buil... Read More about DESI mock challenge: constructing DESI galaxy catalogues based on FastPM simulations.

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., Hayes, R. G., Robertson, A., Cole, S., Lange, S., Li, R., & 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.

The two-point correlation function covariance with fewer mocks (2023)
Journal Article
Trusov, S., Zarrouk, P., Cole, S., Norberg, P., Zhao, C., Aguilar, J. N., …Zhou, Z. (2024). The two-point correlation function covariance with fewer mocks. Monthly Notices of the Royal Astronomical Society, 527(3), 9048-9060. https://doi.org/10.1093/mnras/stad3710

We present FITCOV an approach for accurate estimation of the covariance of two-point correlation functions that requires fewer mocks than the standard mock-based covariance. This can be achieved by dividing a set of mocks into jackknife regions and f... Read More about The two-point correlation function covariance with fewer mocks.

GTC Follow-up Observations of Very Metal-poor Star Candidates from DESI (2023)
Journal Article
Allende Prieto, C., Aguado, D. S., González Hernández, J. I., Rebolo, R., Najita, J., Manser, C. J., …Zou, H. (2023). GTC Follow-up Observations of Very Metal-poor Star Candidates from DESI. Astrophysical Journal, 957(2), Article 76. https://doi.org/10.3847/1538-4357/acfa96

The observations from the Dark Energy Spectroscopic Instrument (DESI) will significantly increase the numbers of known extremely metal-poor stars by a factor of ∼10, improving the sample statistics to study the early chemical evolution of the Milky W... Read More about GTC Follow-up Observations of Very Metal-poor Star Candidates from DESI.

The DESI Bright Galaxy Survey: Final Target Selection, Design, and Validation (2023)
Journal Article
Hahn, C., Wilson, M. J., Ruiz-Macias, O., Cole, S., Weinberg, D. H., Moustakas, J., …Zou, H. (2023). The DESI Bright Galaxy Survey: Final Target Selection, Design, and Validation. Astronomical Journal, 165(6), Article 253. https://doi.org/10.3847/1538-3881/accff8

Over the next 5 yr, the Dark Energy Spectroscopic Instrument (DESI) will use 10 spectrographs with 5000 fibers on the 4 m Mayall Telescope at Kitt Peak National Observatory to conduct the first Stage IV dark energy galaxy survey. At z < 0.6, the DESI... Read More about The DESI Bright Galaxy Survey: Final Target Selection, Design, and Validation.

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., Cole, S., Frenk, C. S., He, Q., Lagattuta, D. J., Lange, S., & 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.

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.

The DESI Survey Validation: Results from Visual Inspection of Bright Galaxies, Luminous Red Galaxies, and Emission-line Galaxies (2023)
Journal Article
Lan, T., Tojeiro, R., Armengaud, E., Prochaska, J. X., Davis, T., Alexander, D. M., …Zhou, Z. (2023). The DESI Survey Validation: Results from Visual Inspection of Bright Galaxies, Luminous Red Galaxies, and Emission-line Galaxies. Astrophysical Journal, 943(1), Article 68. https://doi.org/10.3847/1538-4357/aca5fa

The Dark Energy Spectroscopic Instrument (DESI) Survey has obtained a set of spectroscopic measurements of galaxies to validate the final survey design and target selections. To assist in these tasks, we visually inspect DESI spectra of approximately... Read More about The DESI Survey Validation: Results from Visual Inspection of Bright Galaxies, Luminous Red Galaxies, and Emission-line Galaxies.

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.

A sparse regression approach for populating dark matter haloes and subhaloes with galaxies (2022)
Journal Article
Icaza-Lizaola, M., Bower, R. G., Norberg, P., Cole, S., & Schaller, M. (2022). A sparse regression approach for populating dark matter haloes and subhaloes with galaxies. Monthly Notices of the Royal Astronomical Society, 518(2), 2903-2920. https://doi.org/10.1093/mnras/stac3265

We use sparse regression methods (SRMs) to build accurate and explainable models that predict the stellar mass of central and satellite galaxies as a function of properties of their host dark matter haloes. SRMs are machine learning algorithms that p... Read More about A sparse regression approach for populating dark matter haloes and subhaloes with galaxies.

Galactic satellite systems in CDM, WDM and SIDM (2022)
Journal Article
Forouhar Moreno, V. J., Benítez-Llambay, A., Cole, S., & Frenk, C. (2022). Galactic satellite systems in CDM, WDM and SIDM. Monthly Notices of the Royal Astronomical Society, 517(4), 5627-5641. https://doi.org/10.1093/mnras/stac3062

We investigate the population of bright satellites (⁠M∗≥105M⊙⁠) of haloes of mass comparable to that of the Milky Way in cosmological simulations in which the dark matter (DM) is either cold, warm, or self-interacting (CDM, WDM, and SIDM, respectivel... Read More about Galactic satellite systems in CDM, WDM and SIDM.