Proto-Clusters with Evolved Populations around Radio Galaxies at z~2.5

Details Proto-Clusters with Evolved Populations around Radio Galaxies at z~2.5 Proto-Clusters with Evolved Populations around Radio Galaxies at z~2.5

2006-06-16

arxiv.org/abs/astro-ph/0606407v1

Mon.Not.Roy.Astron.Soc.371:577-582,2006

Astronomy and Astrophysics

Astrophysics

7 pages, 4 figures, accepted for publication in MNRAS

Scientific paper

10.1111/j.1365-2966.2006.10704.x

We report a discovery of proto-cluster candidates around high redshift radio galaxies at z~2.5 on the basis of clear statistical excess of colour-selected galaxies around them seen in the deep near-infrared imaging data obtained with CISCO on Subaru Telescope. We have observed six targets, all at similar redshifts at z~2.5, and our data reach to J=23.5, H=22.6 and K=21.8 (5 sigma) and cover a 1.6' x 1.6' field centered on each radio galaxy. We apply colour cuts in JHKs in order to exclusively search for galaxies located at high redshifts, z>2. Over the magnitude range of 19.52.3 by a factor of two around the combined radio galaxies fields compared to those found in the general field of GOODS South. The excess of galaxies around the radio galaxies fields becomes more than factor of three around 19.5

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