2012/02/29 by Z. L. Wen, J. L. Han, F. S. Liu · 2 citations
Physics and Astronomy · #astro-ph.CO
paper · pdf · doi:10.1088/0067-0049/199/2/34
published as Astrophys.J.Suppl.,199:34(12pp),2012 · 12 pages, 20 figures, 1 table; updated to match the published version
arxiv created 2012/04/28 · arxiv updated 2012/05/01
Using the photometric redshifts of galaxies from the Sloan Digital Sky Survey III (SDSS-III), we identify 132,684 clusters in the redshift range of 0.05<z<0.8. Monte Carlo simulations show that the false detection rate is less than 6% for the whole sample. The completeness is more than 95% for clusters with a mass of M200>1.0*1014 M\odot in the redshift range of 0.05<z<0.42, while clusters of z>0.42 are less complete and have a biased smaller richness than the real one due to incompleteness of member galaxies. We compare our sample with other cluster samples, and find that more than 90% of previously known rich clusters of 0.05<z<0.42 are matched with clusters in our sample. Richer clusters tend to have more luminous brightest cluster galaxies (BCGs). Correlating with X-ray and the Planck data, we show that the cluster richness is closely related to the X-ray luminosity, temperature and Sunyaev-Zel'dovich measurements. Comparison of the BCGs with the SDSS luminous red galaxy (LRG) sample shows that 25% of LRGs are BCGs of our clusters and 36% of LRGs are cluster member galaxies. In our cluster sample, 63% of BCGs of rpetro<19.5 satisfy the SDSS LRG selection criteria.