Bibcode
Díaz-Sánchez, Anastasio; Villo-Pérez, Isidro; Pérez-Garrido, Antonio; Rebolo, Rafael
Bibliographical reference
Monthly Notices of the Royal Astronomical Society, Volume 377, Issue 2, pp. 516-522.
Advertised on:
5
2007
Citations
10
Refereed citations
10
Description
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 ×
1013Msolar. 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.