Central black hole masses of galaxies

In this paper, the stellar velocity dispersions in the host galaxies are used to estimate the central black hole masses for a sample of elliptical galaxies. We find that the central black hole masses are in the range of 10^(5.5-9.5)M_⊙. Based on the estimated masses in this paper and those by Woo & Urry (2002) and the measured host galaxy absolute magnitude, a relation, log (M_BH/M_⊙) = -(0.25\pm4.3\times10^-3)M_\rm R + (2.98\pm0.208) is found for central black hole mass and the host galaxy magnitude. Some discussions are presented.