Discovery of an overdensity of faint red galaxies in the vicinity of the z=1.786 radio galaxy 3C 294

Abstract

We report the discovery of an overdensity of faint red galaxies in the vicinity of the z=1.786 radio galaxy 3C 294. The overdensity, discovered in a 84 min Ks-band ISAAC/VLT image is significant at the 2.4 sigma level (compared to the local field density), and overlaps with the extended X-ray emission around 3C 294 detected with the Chandra X-ray Observatory. The near-infrared colours of the galaxies making up the overdensity show a large scatter and the galaxies do not follow a red sequence in the colour magnitude diagram. If the galaxies are in a cluster at z=1.786 they must be dominated by young stellar populations with different star-formation histories.

arXiv commentAccepted for publication in MNRAS

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Cited by in corpus (8)

• The First Appearance of the Red Sequence of Galaxies in Proto-Clusters at 2<~z<~3
• Extended inverse-Compton emission from distant, powerful radio galaxies
• Properties of Extremely Red Objects in an Overdense Region
• Two Active Nuclei in 3C294
• Morphologies in a Cluster of Extremely Red Galaxies with Old Stellar Populations at z=1.34
• An Overdensity of Extremely Red Objects Around Faint Mid-IR galaxies
• Clustering of red galaxies around the z=1.53 quasar 3C270.1
• 3C 294 revisited: Deep Large Binocular Telescope AO NIR images and optical spectroscopy