Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-04-24
Astron.J. 136 (2008) 358-366
Astronomy and Astrophysics
Astrophysics
14 emulateapj pages, 15 figures, 1 table, accepted for publication in Astronomical Journal. A version with full resolution fig
Scientific paper
10.1088/0004-6256/136/1/358
We present the results of a study of a sample of 375 Extremely Red Galaxies (ERGs) in the Phoenix Deep Survey, 273 of which constitute a subsample which is 80% complete to K_s = 18.5 over an area of 1160 arcmin^2. The angular correlation function for ERGs is estimated, and the association of ERGs with faint radio sources explored. We find tentative evidence that ERGs and faint radio sources are associated at z > 0.5. A new overdensity-mapping algorithm has been used to characterize the ERG distribution, and identify a number of cluster candidates, including a likely cluster containing ERGs at 0.5 < z < 1. Our algorithm is also used in an attempt to probe the environments in which faint radio sources and ERGs are associated. We find limited evidence that the I - K_s > 4 criterion is more efficient than R - K_s > 5 at selecting dusty star-forming galaxies, rather than passively evolving ERGs.
Afonso Jose
Cram Lawrence E.
Georgakakis Antonis E.
Hopkins Andrew M.
Hunstead Richard W.
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