The physical properties of the intergalactic gas in rich clusters of galaxies

We perform a statistical analysis of the properties of 170 rich clusters of galaxies. We confirm the existence of correlations between the X-ray luminosity and temperature of the cluster intergalactic medium (IGM) and between the velocity dispersion of the galaxies and the X-ray luminosity of the IGM. In addition, we have found a new anti-correlation between the optical luminosity in Hα and the X-ray luminosity of the cluster IGM: log $ left( {frac{{L_{Halpha } }} {{L_ odot }}} right) = a - blog left( {frac{{L_x }} {{L_ odot }}} right) $ left( {frac{{L_{Halpha } }} {{L_ odot }}} right) = a - blog left( {frac{{L_x }} {{L_ odot }}} right) . Clusters form sequences with different values of a but similar values of b.