Open AccessA low mass cluster of extremely red galaxies at z = 1.10 in the GOODS Southern Field
Author(s) -
Díaz–Sánchez Anastasio,
Villo–Pérez Isidro,
Pérez–Garrido Antonio,
Rebolo Rafael
Publication year - 2007
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1111/j.1365-2966.2007.11643.x
Subject(s) - physics , astrophysics , redshift , galaxy , velocity dispersion , astronomy , galaxy cluster , luminosity , cluster (spacecraft) , luminosity function , radius , photometric redshift , brightest cluster galaxy , hubble deep field , computer security , computer science , programming language
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 − K s > 4) is found at an average photometric redshift z phot = 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 spec < 1.101 with a line‐of‐sight velocity dispersion of σ v = 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 M cl ∼ 5–7 × 10 13 M ⊙ . Using available Chandra data, we limit the rest‐frame X‐ray luminosity of the cluster to less than L X = 7.3 × 10 42 erg s −1 (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.