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

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-Hernandez, T. Jeltema, D. Hollowood, D. Bacon, D. Capozzi, C. Collins, R. Das, D. Gerdes, C. HennigM. Hilton, B. Hoyle, S. Kay, A. Liddle, R. G. Mann, N. Mehrtens, R. C. Nichol, 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

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

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}*∝ ({M}200}/{1.5×{10}14{M}⊙}) 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 = 1013.8 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.
Original languageEnglish
Pages (from-to)98
Number of pages20
JournalAstrophysical Journal
Issue number2
Publication statusPublished - 14 Jan 2016

Keywords / Materials (for Non-textual outputs)

  • galaxies: clusters: general
  • galaxies: evolution
  • galaxies: groups: general


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