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| - A low mass cluster of extremely red galaxies at z= 1.10 in the GOODS Southern Field
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| - 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 zphot= 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 < zspec< 1.101 with a line-of-sight velocity dispersion of σv= 433+152−74 km s−1 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 Mcl∼ 5-7 × 1013 M⊙. Using available Chandra data, we limit the rest-frame X-ray luminosity of the cluster to less than LX= 7.3 × 1042 erg s−1 (0.5-2.0 keV). This low-mass, low LX cluster at z> 1 shows the potential of EROs to trace clusters of galaxies at high redshift.
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