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We report on the discovery of a z=1.58 mature cluster around thehigh-redshift radio galaxy 7C1753+6311, first identified in the Clusters AroundRadio-Loud AGN survey. Two-thirds of the excess galaxies within the central1Mpc lie on a red sequence with a colour that is consistent with an averageformation redshift of zf~3. We show that 80+/-6% of the red sequence galaxiesin the cluster core are quiescent, while the remaining 20% are red due to dustystar formation. We demonstrate that the cluster has an enhanced quiescentgalaxy fraction that is three times that of the control field. We also showthat this enhancement is mass dependent: 91+/-9% of the M* >10^{10.5}Msuncluster galaxies are quiescent, compared to only 36+/-2% of field galaxies,whereas the fraction of quiescent galaxies with lower masses is the same in thecluster 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 thatdistant radio galaxies do not solely reside in young, uncollapsedprotoclusters, rather they can be found in clusters in a wide range ofevolutionary states.

A mature galaxy cluster at z=1.58 around the radio galaxy 7C1753+6311