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
- Department of Physics, University of Michigan, Ann Arbor, MI 48109 (United States)
- Department of Physics and Astronomy, Pevensey Building, University of Sussex, Brighton, BN1 9QH (United Kingdom)
- Department of Astronomy, Yale University, New Haven, CT, 06511-8903 (United States)
- Korea Astronomy and Space Science Institute, 776, Daedeokdae-ro,Yuseong-gu, Daejeon, 305-348 (Korea, Republic of)
- Department of Physics, Ludwig-Maximilians-Universität, Scheinerstr. 1, D-81679 München (Germany)
- Institute of Cosmology and Gravitation, University of Portsmouth, Portsmouth, PO1 3FX (United Kingdom)
- Department of Physics and Santa Cruz Institute for Particle Physics, University of California, Santa Cruz, CA 95064 (United States)
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{sub ∗}∝(((M{sub 200})/(1.5×10{sup 14}M{sub ⊙}))){sup 0.24±0.08}(1+z){sup −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 M{sub 200,z} = 10{sup 13.8} M{sub ⊙}; at z = 1.0: m{sub *,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.
- OSTI ID:
- 22882302
- Journal Information:
- Astrophysical Journal, Vol. 816, Issue 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Since 2009, the country of publication for this journal is the UK.; ISSN 0004-637X
- Country of Publication:
- United Kingdom
- Language:
- English
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Galaxies in X-ray Selected Clusters and Groups in Dark Energy Survey Data: Stellar Mass Growth of Bright Central Galaxies Since z~1.2
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