The Nature, Evolution, Clustering and X-ray Properties of Extremely Red Galaxies in the CDFS/GOODS field

Details The Nature, Evolution, Clustering and X-ray Properties of Extremely Red Galaxies in the CDFS/GOODS field The Nature, Evolution, Clustering and X-ray Properties of Extremely Red Galaxies in the CDFS/GOODS field

2003-03-10

arxiv.org/abs/astro-ph/0303206v5

Mon.Not.Roy.Astron.Soc. 346 (2003) 803

Astronomy and Astrophysics

Astrophysics

17 pages, latex, 14 figures, accepted for publication in MNRAS. Major revisions from original version, with a new, reselected

Scientific paper

10.1111/j.1365-2966.2003.07122.x

We identify a deep sample of 198 extremely red objects (EROs) in (50.4 sq. arcmin of) the Chandra Deep Field South, selected as I-K>3.92 galaxies to a limit K=22. The ERO number counts remain well below the predictions for pure luminosity evolution, and fall below even a non-evolving model, suggesting the comoving number density of passive/very red galaxies decreases with redshift. The angular correlation function of these EROs indicates stronger clustering than that of other galaxies at the same magnitudes, and is best-fitted by models in which the EROs have a comoving correlation radius 12.5/h Mpc, or 21.4/h Mpc in a stable clustering model. We find a 40-arcsec diameter grouping of 10 EROs, centered on the Chandra source (and ERO) XID:58, with colours suggesting a cluster of mostly passive EROs at approx. z=1.5. The 942 ksec Chandra survey detected 73 X-ray sources in the area of our ERO sample, of which 17 coincide with EROs. Of these sources, 13 have X-ray properties indicative of obscured AGN, while the faintest 4 may be starburst galaxies. In addition, we find evidence that Chandra sources and EROs are positively cross-correlated at non-zero (2-20 arcsec) separations, implying that they tend to trace the same large-scale structures.

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