A mature galaxy cluster at z= 1.58 around the radio galaxy 7C 1753+6311

Cooke, Elizabeth A. and Hatch, Nina A. and Stern, D. and Rettura, A. and Brodwin, M. and Galametz, A. and Wylezalek, D. and Bridge, C. and Conselice, C.J. and Breuck, C. De and Gonzalez, A.H. and Jarvis, M. (2016) A mature galaxy cluster at z= 1.58 around the radio galaxy 7C 1753+6311. Astrophysical Journal, 816 (2). 83/1-83/8. ISSN 1538-4357

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We report on the discovery of a z = 1.58 mature cluster around the high-redshift radio galaxy 7C 1753+6311, first identified in the Clusters Around Radio-loud active galactic nuclei survey. Two-thirds of the excess galaxies within the central 1 Mpc lie on a red sequence with a color that is consistent with an average formation redshift of zf ~ 3. We show that 80 ± 6% of the red sequence galaxies in the cluster core are quiescent, while the remaining 20% are red due to dusty star formation. We demonstrate that the cluster has an enhanced quiescent galaxy fraction that is three times that of the control field. We also show that this enhancement is mass dependent: 91 ± 9% of the ${M}_{*}\gt {10}^{10.5}$M⊙ cluster galaxies are quiescent, compared to only 36 ± 2% of field galaxies, whereas the fraction of quiescent galaxies with lower masses is the same in the cluster and field environments. The presence of a dense core and a well-formed, quiescent red sequence suggest that this is a mature cluster. This means that distant radio galaxies do not solely reside in young, uncollapsed protoclusters, rather they can be found in clusters in a wide range of evolutionary states.

Item Type: Article
Keywords: galaxies: clusters: individual (CARLA J1753+6311); galaxies: evolution; galaxies: formation; galaxies: high-redshift; galaxies: individual (7C 1753+6311)
Schools/Departments: University of Nottingham UK Campus > Faculty of Science > School of Physics and Astronomy
Identification Number: https://doi.org/10.3847/0004-637X/816/2/83
Depositing User: Eprints, Support
Date Deposited: 28 Sep 2016 14:02
Last Modified: 29 Sep 2016 10:22
URI: http://eprints.nottingham.ac.uk/id/eprint/37220

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