Palmese, A;
Annis, J;
Burgad, J;
Farahi, A;
Soares-Santos, M;
Welch, B;
Pereira, MDS;
... Walker, AR; + view all
(2020)
Stellar mass as a galaxy cluster mass proxy: application to the Dark Energy Survey redMaPPer clusters.
Monthly Notices of the Royal Astronomical Society
, 493
(4)
pp. 4591-4606.
10.1093/mnras/staa526.
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Abstract
We introduce a galaxy cluster mass observable, μ⋆, based on the stellar masses of cluster members, and we present results for the Dark Energy Survey (DES) Year 1 (Y1) observations. Stellar masses are computed using a Bayesian model averaging method, and are validated for DES data using simulations and COSMOS data. We show that μ⋆ works as a promising mass proxy by comparing our predictions to X-ray measurements. We measure the X-ray temperature–μ_{⋆} relation for a total of 129 clusters matched between the wide-field DES Y1 redMaPPer catalogue and Chandra and XMM archival observations, spanning the redshift range 0.1 < z < 0.7. For a scaling relation that is linear in logarithmic space, we find a slope of α = 0.488 ± 0.043 and a scatter in the X-ray temperature at fixed μ_{*} of σ1nT_{x}|μ_{*} = 0.266_{-0.020}^{+0.019} for the joint sample. By using the halo mass scaling relations of the X-ray temperature from the Weighing the Giants program, we further derive the μ⋆-conditioned scatter in mass, finding σ1nM|μ_{*} = 0.26_{-0.10}^{+0.15}. These results are competitive with well-established cluster mass proxies used for cosmological analyses, showing that μ_{⋆} can be used as a reliable and physically motivated mass proxy to derive cosmological constraints.
| Type: | Article |
|---|---|
| Title: | Stellar mass as a galaxy cluster mass proxy: application to the Dark Energy Survey redMaPPer clusters |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/staa526 |
| Publisher version: | https://doi.org/10.1093/mnras/staa526 |
| 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: | surveys, galaxies: clusters: general, galaxies: evolution, galaxies: haloes cosmology: observations, |
| 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/10103073 |
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