A Massive Cluster of Galaxies at z = 0.996
Astrophysics
2009-10-30 v1
Abstract
We report the identification of a cluster of galaxies around the high-redshift radio galaxy 3CR184 at z = 0.996. The identification is supported by an excess of galaxies observed in projection in I band images (both in ground-based and HST data), a peak in the redshift distribution comprising 11 galaxies (out of 56 with measured redshifts) in a ~2000 km/s velocity interval, and the observation on HST WFPC2 frames of a gravitational arc seen projected at 42kpc away from the central radio galaxy. We thus have strong evidence for the presence of a massive cluster at z~1.
Cite
@article{arxiv.astro-ph/9704086,
title = {A Massive Cluster of Galaxies at z = 0.996},
author = {J. -M. Deltorn and O. Le Fevre and David Crampton and M. Dickinson},
journal= {arXiv preprint arXiv:astro-ph/9704086},
year = {2009}
}
Comments
13 pages, 2 figures (one in color), LaTex file. Accepted for publication in ApJ letters