A CATALOG OF 132,684 CLUSTERS OF GALAXIES IDENTIFIED FROM SLOAN DIGITAL SKY SURVEY III

Abstract

Using the photometric redshifts of galaxies from the Sloan Digital Sky Survey\nIII (SDSS-III), we identify 132,684 clusters in the redshift range of\n0.05<z<0.8. Monte Carlo simulations show that the false detection rate is less\nthan 6% for the whole sample. The completeness is more than 95% for clusters\nwith a mass of M_{200}>1.0*10^{14} M_{\\odot} in the redshift range of\n0.05<z<0.42, while clusters of z>0.42 are less complete and have a biased\nsmaller richness than the real one due to incompleteness of member galaxies. We\ncompare our sample with other cluster samples, and find that more than 90% of\npreviously known rich clusters of 0.05<z<0.42 are matched with clusters in our\nsample. Richer clusters tend to have more luminous brightest cluster galaxies\n(BCGs). Correlating with X-ray and the Planck data, we show that the cluster\nrichness is closely related to the X-ray luminosity, temperature and\nSunyaev-Zel'dovich measurements. Comparison of the BCGs with the SDSS luminous\nred galaxy (LRG) sample shows that 25% of LRGs are BCGs of our clusters and 36%\nof LRGs are cluster member galaxies. In our cluster sample, 63% of BCGs of\nr_{petro}<19.5 satisfy the SDSS LRG selection criteria.\n