Solid observational evidences indicate a strong dependence of the galaxy formation and evolution on the environment .
In order to study in particular the interaction between the intracluster medium and the evolution of cluster galaxies , we have created a large database of clusters of galaxies based on the largest available X-ray and optical surveys : the ROSAT All Sky Survey ( RASS ) , and the Sloan Digital Sky Survey ( SDSS ) .
We analyzed the correlation between the total optical and the X-ray cluster luminosity .
The resulting correlation of L _ { X } 
and L _ { op } shows a logarithmic slope of 0.6 , a value close to the self-similar correlation .
We analysed also the cluster mass to light ratio , by finding 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 .