GALAXY CLUSTERS IDENTIFIED FROM THE SDSS DR6 AND THEIR PROPERTIES

Clusters of galaxies in most previous catalogs have redshifts z � 0.3. Using the photometric redshifts of galaxies from the Sloan Digital Sky Survey Data Release 6 (SDSS DR6), we identify 39,668 clusters in the redshift range 0.05 2 � 10 14 M� ) clusters of z � 0.42. The false detection rate is � 5%. We obtain the richness, the summed luminosity, and the gross galaxy number within the determined radius for identified clusters. They are tightly related to the X-ray luminosity and temperature of clusters. Cluster mass is rel ated to the richness and summed luminosity with M200 / R 1.90� 0.04 and M200 / L 1.64� 0.03 r , respectively. In addition, 685 new candidates of X-ray clusters are found by cross-identification of our clusters with the so urce list of the ROSAT X-ray survey. Subject headings:galaxies: clusters: general — galaxies: distances and reds hifts

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