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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

Research output: Contribution to journalArticlepeer-review

  • Y. Zhang
  • C. Miller
  • T. Mckay
  • P. Rooney
  • A. E. Evrard
  • A. K. Romer
  • R. Perfecto
  • J. Song
  • S. Desai
  • J. Mohr
  • H. Wilcox
  • A. Bermeo
  • T. Jeltema
  • D. Hollowood
  • D. Capozzi
  • C. Collins
  • D. Gerdes
  • C. Hennig
  • M. Hilton
  • B. Hoyle
  • S. Kay
  • A. Liddle
  • R. G. Mann
  • N. Mehrtens
  • C. Papovich
  • M. Sahlén
  • M. Soares-Santos
  • J. Stott
  • P. T. Viana
  • T. Abbott
  • F. B. Abdalla
  • M. Banerji
  • A. H. Bauer
  • A. Benoit-Lévy
  • 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
  • D. James
  • K. Kuehn
  • N. Kuropatkin
  • O. Lahav
  • M. A. G. Maia
  • M. Makler
  • J. L. Marshall
  • Paul Martini
  • R. Miquel
  • R. Ogando
  • A. A. Plazas
  • A. Roodman
  • E. S. Rykoff
  • M. Sako
  • E. Sanchez
  • V. Scarpine
  • M. Schubnell
  • I. Sevilla
  • R. C. Smith
  • F. Sobreira
  • E. Suchyta
  • M. E. C. Swanson
  • G. Tarle
  • J. Thaler
  • D. Tucker
  • V. Vikram
  • L. N. Da Costa
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∗∝(M2001.5×1014M⊙)0.24±0.08(1+z)−0.19±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=1013.8M⊙, at z=1.0: m∗,BCG appears to have grown by 0.13±0.11 dex, in tension at ∼2.5σ 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.
Original languageEnglish
Article number98
JournalThe Astrophysical Journal
Issue number2
Publication statusPublished - Jan 2016


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