GALAXIES IN X-RAY SELECTED CLUSTERS AND GROUPS IN DARK ENERGY SURVEY DATA. I. STELLAR MASS GROWTH OF BRIGHT CENTRAL GALAXIES SINCE z similar to 1.2

Zhang, Y, Miller, C, McKay, T, Rooney, P, Evrard, AE, Romer, AK, Perfecto, R, Song, J, Desai, S, Mohr, J, Wilcox, H, Bermeo-Hernandez, A, Jeltema, T, Hollowood, D, Bacon, D, Capozzi, D, Collins, CA, Das, R, Gerdes, D, Hennig, C et al (2016) GALAXIES IN X-RAY SELECTED CLUSTERS AND GROUPS IN DARK ENERGY SURVEY DATA. I. STELLAR MASS GROWTH OF BRIGHT CENTRAL GALAXIES SINCE z similar to 1.2. ASTROPHYSICAL JOURNAL, 816 (2). ISSN 0004-637X

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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.

Item Type:	Article
Uncontrolled Keywords:	0201 Astronomical And Space Sciences, 0305 Organic Chemistry, 0306 Physical Chemistry (Incl. Structural)
Subjects:	Q Science > QB Astronomy
Divisions:	Astrophysics Research Institute
Publisher:	IOP PUBLISHING LTD
Related URLs:	http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000368238500050&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=7f77ca1697db64ccb27a8011c7ced90d
Date of acceptance:	18 November 2015
Date of first compliant Open Access:	9 February 2016
Date Deposited:	09 Feb 2016 12:55
Last Modified:	04 Sep 2021 13:27
DOI or ID number:	10.3847/0004-637X/816/2/98
URI:	https://ljmu-9.eprints-hosting.org/id/eprint/2885

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