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2016ApJ...816...98Z - Astrophys. J., 816, 98 (2016/January-2)

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.

ZHANG Y., MILLER C., McKAY T., ROONEY P., EVRARD A.E., ROMER A.K., PERFECTO R., SONG J., DESAI S., MOHR J., WILCOX H., BERMEO-HERNANDEZ A., JELTEMA T., HOLLOWOOD D., BACON D., CAPOZZI D., COLLINS C., DAS R., GERDES D., HENNIG C., HILTON M., HOYLE B., KAY S., LIDDLE A., MANN R.G., MEHRTENS N., NICHOL R.C., PAPOVICH C., SAHLEN M., SOARES-SANTOS M., STOTT J., VIANA P.T., ABBOTT T., ABDALLA F.B., BANERJI M., BAUER A.H., BENOIT-LEVY A., BERTIN E., BROOKS D., BUCKLEY-GEER E., BURKE D.L., CARNERO ROSELL A., CASTANDER F.J., DIEHL H.T., DOEL P., CUNHA C.E., EIFLER T.F., FAUSTI NETO A., FERNANDEZ E., FLAUGHER B., FOSALBA P., FRIEMAN J., GAZTANAGA E., GRUEN D., GRUENDL R.A., HONSCHEID K., JAMES D., KUEHN K., KUROPATKIN N., LAHAV O., MAIA M.A.G., MAKLER M., MARSHALL J.L., MARTINI P., MIQUEL R., OGANDO R., PLAZAS A.A., ROODMAN A., RYKOFF E.S., SAKO M., SANCHEZ E., SCARPINE V., SCHUBNELL M., SEVILLA I., SMITH R.C., SOBREIRA F., SUCHYTA E., SWANSON M.E.C., TARLE G., THALER J., TUCKER D., VIKRAM V. and DA COSTA L.N.

Abstract (from CDS):

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_*∝[?\left?](\fracM₂₀₀1.5×10¹⁴M_☉[?\right?])^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 M_200,z = 10^13.8 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.

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Journal keyword(s): galaxies: clusters: general - galaxies: evolution - galaxies: groups: general

VizieR on-line data: <Available at CDS (J/ApJ/816/98): table3.dat>

Status at CDS : All or part of tables of objects will be ingested in SIMBAD with priority 1.

Simbad objects: 109

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