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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 ∼ 1.2

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  • Y. Zhang
  • C. Miller
  • T. McKay
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  • T. Abbott
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  • E. Bertin
  • D. Brooks
  • E. Buckley-Geer
  • D. L. Burke
  • A. Carnero Rosell
  • F. J. Castander
  • H. T. Diehl
  • P. Doel
  • C. E. Cunha
  • T. F. Eifler
  • A. Fausti Neto
  • E. Fernandez
  • B. Flaugher
  • P. Fosalba
  • J. Frieman
  • E. Gaztanaga
  • D. Gruen
  • R. A. Gruendl
  • K. Honscheid
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  • J. L. Marshall
  • Paul Martini
  • R. Miquel
  • R. Ogando
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  • A. Roodman
  • E. S. Rykoff
  • M. Sako
  • E. Sanchez
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  • I. Sevilla
  • R. C. Smith
  • F. Sobreira
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  • V. Vikram
  • L. N. da Costa
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Article number98
<mark>Journal publication date</mark>14/01/2016
<mark>Journal</mark>The Astrophysical Journal
Issue number2
Volume816
Number of pages20
Publication StatusPublished
<mark>Original language</mark>English

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, , 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 Mo; 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.