GALAXY CLUSTERS IDENTIFIED FROM THE SDSS DR6 AND THEIR PROPERTIES
- National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing 100012 (China)
Clusters of galaxies in most of the 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 39,716 clusters in the redshift range 0.05 < z < 0.6 with more than eight luminous (M{sub r} {<=} -21) member galaxies. Cluster redshifts are estimated accurately with an uncertainty of less than 0.022. The contamination rate of member galaxies is found to be roughly 20%, and the completeness of member galaxy detection reaches {approx}90%. Monte Carlo simulations show that the cluster detection rate is more than 90% for massive (M {sub 200} > 2 x 10{sup 14} M {sub sun}) clusters of z {<=} 0.42. The false detection rate is {approx}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 related to the richness and summed luminosity with M {sub 200} {proportional_to} R {sup 1.90{+-}}{sup 0.04} and M {sub 200} {proportional_to} L {sup 1.64{+-}}{sup 0.03} {sub r}, respectively. In addition, 790 new candidates of X-ray clusters are found by cross-identification of our clusters with the source list of the ROSAT X-ray survey.
- OSTI ID:
- 21301179
- Journal Information:
- Astrophysical Journal, Supplement Series, Vol. 183, Issue 2; Other Information: DOI: 10.1088/0067-0049/183/2/197; Country of input: International Atomic Energy Agency (IAEA); ISSN 0067-0049
- Country of Publication:
- United States
- Language:
- English
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