TITLE:
Luminous red galaxy population in clusters at 0.2<=z<=0.6.
AUTHOR(S):
Shirley Ho, Yen-Ting Lin, David Spergel (Princeton); Christopher M. Hirata (IAS).
DATE:
2007 Jun 05 (arXiv, posted, v1, v2);
2007 Oct 16 (ApJ, submitted);
2009 Jan 16 (revised);
2009 Mar 05 (ApJ, accepted);
2009 May 12 (ApJ, published);
2009 Jun 05 (arXiv, posted, v3).
AVAILABILITY:
arXiv 0706.0727 (free);
IOP (requires subscription).
PUBLICATION INFORMATION:
Astrophys. J., 697, 1358--1368, 2009.
ABSTRACT:
We investigate statistical properties of LRGs in a sample of X-ray selected galaxy clusters at intermediate redshift (0.2<=z<=0.6). The LRGs are
selected based on carefully designed color criteria, and the cluster membership is assessed via photometric redshifts. As clusters and LRGs are both
viewed as promising tracer of the underlying dark matter distribution, understanding the distribution of LRGs within clusters is an important issue.
Our main findings include:
1. The halo occupation distribution of LRGs inside our cluster sample is $N(M)=k(M/1014)a$ where a=0.620+/-0.105 and
k=1.425+/-0.285 assuming a Poisson distribution for N(M).
2. The halo occupation distribution of LRGs (N(M)) and the satellite distribution of LRGs (N-1(M)) are both consistent with being Poisson. To be
more quantitative, we find Var(N)/
ADS BIBLIOGRAPHIC CODE: N/A.
COMMENTS: SDSS Publication #777.