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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 , Hilton, M, Hoyle, B, Kay, S, Liddle, A, Mann, RG, Mehrtens, N, Nichol, RC, Papovich, C, Sahlen, M, Soares-Santos, M, Stott, J, Viana, PT, Abbott, T, Abdalla, FB, Banerji, M, Bauer, AH, Benoit-Levy, A, Bertin, E, Brooks, D, Buckley-Geer, E, Burke, DL, Rosell, AC, Castander, FJ, Diehl, HT, Doel, P, Cunha, CE, Eifler, TF, Fausti Neto, A, Fernandez, E, Flaugher, B, Fosalba, P, Frieman, J, Gaztanaga, E, Gruen, D, Gruendl, RA, Honscheid, K, James, D, Kuehn, K, Kuropatkin, N, Lahav, O, Maia, MAG, Makler, M, Marshall, JL, Martini, P, Miquel, R, Ogando, R, Plazas, AA, Roodman, A, Rykoff, ES, Sako, M, Sanchez, E, Scarpine, V, Schubnell, M, Sevilla, I, Smith, RC, Sobreira, F, Suchyta, E, Swanson, MEC, Tarle, G, Thaler, J, Tucker, D, Vikram, V and da Costa, LN (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:
Date Deposited: 09 Feb 2016 12:55
Last Modified: 06 Sep 2017 20:07
DOI or Identification number: 10.3847/0004-637X/816/2/98
URI: http://researchonline.ljmu.ac.uk/id/eprint/2885

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