Mass Distribution Around the Black Holes at the Centers of BL Lac Objects

Based on the X—ray luminosity and short time scales, the unification of RBLs and XBLs is confirmed since they satisty the same relation of logt+l/5 logL_x—logt+3/5 log L_x.Also, the mass distribution around the black holes at the centers if BL Lac objects is obtained if the X-ray luminosity is supposed to be from the released gravitational energy.The distribution is consistent with the previous results.