We analyse a subsample of the galaxy groups obtained by Merch\'an & Zandivarez (2005) from the SDSS DR3 to study the fundamental plane and the mass to light ratio of galaxy groups. We find a fundamental plane given by $L_R \propto R^{ 1.3} \sigma^{ 0.7}$. We do not find differences when different dynamical sates or redshift ranges are analysed. We find that the mass to light ratio increases with group mass as $M/L_R \propto M^{ 0.36}$.
Categories: astro-ph