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The mass and galaxy distribution around SZ-selected clusters

Shin, T; Jain, B; Adhikari, S; Baxter, EJ; Chang, C; Pandey, S; Salcedo, A; ... Zhang, Y; + view all (2021) The mass and galaxy distribution around SZ-selected clusters. Monthly Notices of the Royal Astronomical Society , 507 (4) pp. 5758-5779. 10.1093/mnras/stab2505. (In press). Green open access

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Abstract

We present measurements of the radial profiles of the mass and galaxy number density around Sunyaev–Zel’dovich (SZ)-selected clusters using both weak lensing and galaxy counts. The clusters are selected from the Atacama Cosmology Telescope Data Release 5 and the galaxies from the Dark Energy Survey Year 3 data set. With signal-to-noise ratio of 62 (45) for galaxy (weak lensing) profiles over scales of about 0.2–20 h−1 Mpc, these are the highest precision measurements for SZ-selected clusters to date. Because SZ selection closely approximates mass selection, these measurements enable several tests of theoretical models of the mass and light distribution around clusters. Our main findings are: (1) The splashback feature is detected at a consistent location in both the mass and galaxy profiles and its location is consistent with predictions of cold dark matter N-body simulations. (2) The full mass profile is also consistent with the simulations. (3) The shapes of the galaxy and lensing profiles are remarkably similar for our sample over the entire range of scales, from well inside the cluster halo to the quasilinear regime. We measure the dependence of the profile shapes on the galaxy sample, redshift, and cluster mass. We extend the Diemer & Kravtsov model for the cluster profiles to the linear regime using perturbation theory and show that it provides a good match to the measured profiles. We also compare the measured profiles to predictions of the standard halo model and simulations that include hydrodynamics. Applications of these results to cluster mass estimation, cosmology, and astrophysics are discussed.

Type: Article
Title: The mass and galaxy distribution around SZ-selected clusters
Open access status: An open access version is available from UCL Discovery
DOI: 10.1093/mnras/stab2505
Publisher version: https://doi.org/10.1093/mnras/stab2505
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: galaxies: clusters: general, galaxies: evolution, cosmology: observations, ATACAMA COSMOLOGY TELESCOPE, SPLASHBACK RADIUS, ASSEMBLY BIAS, DATA RELEASE, HALO-MASS, 1ST DATA, SIMULATIONS, DES, SUBSTRUCTURE, CALIBRATION
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/10136806
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