A low mass cluster of extremely red galaxies at z=1.10 in the GOODS Southern Field

Abstract

We have studied the spatial clustering of high redshift (z > 1) extremely red objects (EROs) as a function of photometric redshift in the GOODS Southern Field using public data. A remarkable overdensity of extremely red galaxies (I-Ks > 4) is found at an average photometric redshift z=1.10. Nine objects (six are EROs) within 50 arcsec of the brightest infrared galaxy in this overdensity present spectroscopic redshifts in the range 1.094 < z < 1.101 with a line-of-sight velocity dispersion of 433 km/s typical of an Abell richness class R=0 cluster. Other potential members of this cluster, designated as GCL J0332.2-2752, have been identified using photometric redshifts and the galaxy density profile studied as a function of radius. The mass of the cluster is preliminary estimated at M ~ 5-7 x 10^{13} M_{\sun}. Using available Chandra data, we limit the rest-frame X-ray luminosity of the cluster to less than L_X = 7.3 x 10^{42} erg/s (0.5-2.0 keV). This low-mass, low L_X cluster at z > 1 shows the potential of EROs to trace clusters of galaxies at high redshift.

Accepted for publication in MNRAS, 18 Feb 07

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• Deep 1.1 mm-wavelength imaging of the GOODS-South field by AzTEC/ASTE -- II. Redshift distribution and nature of the submillimetre galaxy population
• A Comprehensive Study of Large Scale Structures in the GOODS-SOUTH Field up to z \sim 2.5
• A Photometrically Detected Forming Cluster of Galaxies at Redshift 1.6 in the GOODS Field
• The PEP survey: clustering of infrared-selected galaxies and structure formation at z~2 in the GOODS South
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• The Phoenix Deep Survey: Extremely Red Galaxies and Cluster Candidates