Central black hole mass determination for blazars

In this paper, we use a method to determine some basic parameters for the \gamma-ray loud blazars. The parameters include the central black mass (M), the boosting factor (\delta), the propagation angle (\it \it\Phi), the distance along the axis to the site of the \gamma-ray production (d). A sample including 32 \gamma-ray loud blazars with available variability time scales has been used to discuss the above properties. In this method, the \gamma-ray energy, the emission size and the property of the accretion disc determine the absorption effect. If we take the intrinsic \gamma-ray luminosity to be \lambda times the Eddington luminosity, i.e. L_\gamma^\rm in=\lambdaL_\rm Edd, then we have the following results: the mass of the black hole is in the range of (0.59-67.99)\times10^7M_\odot \ (\lambda=1.0) or (0.90-104.13)\times10^7M_\odot \ (\lambda=0.1); the boosting factor (\delta) in the range of 0.16-2.09(\lambda=1.0) or 0.24-2.86\ (\lambda=0.1); the angle (\it\Phi) in the range of 9.53^\circ-73.85^\circ\ (\lambda=1.0) or 7.36^\circ-68.89^\circ\ (\lambda=0.1); and the distance (d/R_\rm g) in the range of 22.39-609.36\ (\lambda=1.0) or 17.54-541.88\ (\lambda=0.1).