Zhang, Y;
Miller, C;
McKay, T;
Rooney, P;
Evrard, AE;
Romer, AK;
Perfecto, R;
... da Costa, LN; + view all
(2016)
Galaxies in X-ray Selected Clusters and Groups in Dark Energy Survey Data. I. Stellar Mass Growth of Bright Central Galaxies Since z ~ 1.2.
The Astrophysical Journal
, 816
(2)
, Article 98. 10.3847/0004-637X/816/2/98.
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Abstract
Using the science verification data of the Dark Energy Survey for a new sample of 106 X-ray selected clusters and groups, we study the stellar mass growth of bright central galaxies (BCGs) since redshift z ~ 1.2. Compared with the expectation in a semi-analytical model applied to the Millennium Simulation, the observed BCGs become under-massive/under-luminous with decreasing redshift. We incorporate the uncertainties associated with cluster mass, redshift, and BCG stellar mass measurements into an analysis of a redshift-dependent BCG-cluster mass relation, ${m}_{*}\propto {\left(\frac{{M}_{200}}{1.5\times {10}^{14}{M}_{\odot }}\right)}^{0.24\pm 0.08}{(1+z)}^{-0.19\pm 0.34}$, and compare the observed relation to the model prediction. We estimate the average growth rate since z = 1.0 for BCGs hosted by clusters of M200,z = 1013.8 M⊙; at z = 1.0: m*,BCG appears to have grown by 0.13 ± 0.11 dex, in tension at the ~2.5σ significance level with the 0.40 dex growth rate expected from the semi-analytic model. We show that the build-up of extended intracluster light after z = 1.0 may alleviate this tension in BCG growth rates.
| Type: | Article |
|---|---|
| Title: | Galaxies in X-ray Selected Clusters and Groups in Dark Energy Survey Data. I. Stellar Mass Growth of Bright Central Galaxies Since z ~ 1.2 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.3847/0004-637X/816/2/98 |
| Publisher version: | https://doi.org/10.3847/0004-637X/816/2/98 |
| 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, galaxies: groups: general |
| 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/10055819 |
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