Systems of Galaxies in the SDSS: the fundamental plane

Abstract

We analyse a subsample of the galaxy groups obtained by Merchán & 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 $M/L_R\propto M^{0.36}$.

5 pages, 5 figures, 1 table. Accepted to be published in MNRAS