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

Abstract

Using the science verification data of the Dark Energy Survey (DES) 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 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 analysis of a redshift-dependent BCG-cluster mass relation, $m_{\ast }\propto (\frac{M_{200}}{1.5\times 10^{14}{M}_{\odot }}{)}^{0.24\pm 0.08}(1+z{)}^{-0.19\pm 0.34}$, 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 $M_{200,z}=10^{13.8}{M}_{\odot }$, at $z=1.0$: $m_{\ast ,BCG}$ appears to have grown by $0.13\pm 0.11$ dex, in tension at $\sim 2.5\sigma$ significance level with the $0.40$ dex growth rate expected from the semi-analytic model. We show that the buildup of extended intra-cluster light after $z=1.0$ may alleviate this tension in BCG growth rates.

Accepted to ApJ

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