ROSAT-SDSS Galaxy Clusters Survey. Correlating X-ray and optical properties

Details ROSAT-SDSS Galaxy Clusters Survey. Correlating X-ray and optical properties ROSAT-SDSS Galaxy Clusters Survey. Correlating X-ray and optical properties

2004-03-15

arxiv.org/abs/astro-ph/0403357v1

Astronomy and Astrophysics

Astrophysics

Proceedings of 'Modelling the Intracluster and Intergalactic Medium' conference held in Vulcano (Italy), October 2003, S. Borg

Scientific paper

For a detailed comparison of the appearance of cluster of galaxies in X-rays and in the optical, we have compiled a comprehensive database of X-ray and optical properties of a sample of clusters based on the largest available X-ray and optical surveys: the ROSAT All Sky Survey (RASS) and the Sloan Digital Sky Survey (SDSS). The RASS-SDSS sample comprises 114 X-ray selected clusters. For each system we have uniformly determined the X-ray and optical properties . For a subsample of 53 clusters we have also compiled the temperature and the iron abundance from the literature. The total optical luminosity can be determined with a typical uncertainty of 20% with a result independent of the choice of local or global background subtraction. We searched for parameters which provide the best correlation between the X-ray luminosity and the optical properties and found that the z band luminosity determined within a cluster aperture of 0.5 Mpc h_{70}^{-1} provides the best correlation with a scatter of about 60%. The resulting correlation of L_X and L_{op} in the z and i bands shows a logarithmic slope of 0.38, a value not consistent with the assumption of a constant M/L. Consistency is found, however, for an increasing M/L with luminosity. This is confirmed by our analysis of the cluster mass to light ratio for a subsample of 53 clusters. We found a significant dependence of M/L on the cluster mass with a logarithmic slope ranging from 0.27 in the i and r bands to 0.22 in the z band.

Affiliated with

Also associated with

No associations

Rating

ROSAT-SDSS Galaxy Clusters Survey. Correlating X-ray and optical properties does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with ROSAT-SDSS Galaxy Clusters Survey. Correlating X-ray and optical properties, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and ROSAT-SDSS Galaxy Clusters Survey. Correlating X-ray and optical properties will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-573736