Clustering of K-selected Galaxies at 2<z<3.5: Evidence for a Color-Density Relation

Details Clustering of K-selected Galaxies at 2<z<3.5: Evidence for a Color-Density Relation Clustering of K-selected Galaxies at 2<z<3.5: Evidence for a Color-Density Relation

2006-06-14

arxiv.org/abs/astro-ph/0606330v4

Astrophys.J.654:138-152,2006

Astronomy and Astrophysics

Astrophysics

17 pages in emulateapj style, 14 figures. Resubmitted to ApJ after referee's report; minor clarifications and revisions. Updat

Scientific paper

10.1086/509065

We study the clustering properties of K-selected galaxies at 22.3 distant red galaxies (DRGs) have r_0 ~ 11 h^-1 Mpc. Contrary to findings for optically-selected galaxies, K-selected galaxies that are faint in the R-band cluster more strongly than brighter galaxies. These results suggest that a color-density relation was in place at z>2. Our results indicate that K-bright blue galaxies and K-bright red galaxies are fundamentally different, as they have different clustering properties. Using a simple model of one galaxy per halo, we infer halo masses ~ 5 x 10^12 M_sun for K<21 galaxies and ~ 2 x 10^13 M_sun for DRGs. A comparison of the observed space density of DRGs to the density of their host halos suggests large halo occupation numbers; however, this result is at odds with the lack of a strong small-scale excess in the angular correlation function. We find that the z=0 descendants of the galaxies considered here reside primarily in groups and clusters. [abridged]

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