The central black hole masses and Doppler factors of the gamma -ray loud blazars

In this paper, the central black hole masses and the Doppler factors are derived for PKS 0528+134, PKS 0537-441, 3C 279, PKS 1406-074, PKS 1622-297, Q1633+382, Mkn 501, and BL Lacertae. The masses obtained are in the range of (1 - 7) 10(7) M_sun and compared with that obtained with the Klein-Nishina cross section considered \cite[(Dermer & Gehrels 1995).]{D95} If we considered only the Thomson cross section, the masses are in the range of 2.6 x 10(6) M_sun - 2 x 10(11) M_sun. The masses obtained from our method are less sensitive to the flux than those obtained from Dermer & Gehrels (1995) method. The masses obtained from two flares (1991 and 1996 flares) of 3C 279 are almost the same. For 3C 279 and BL Lacertae, viewing angle, theta , and Lorentz factor, Gamma , are estimated from the derived Doppler factor and the measured superluminal velocity. For 3C 279, theta = 10.9 deg -15.6 deg, Gamma = 2.4-14.4 for delta = 3.37; theta = 8.45 deg -9.7 deg, Gamma = 2.95-11.20 for delta = 4.89; for BL Lacertae, theta = 25 deg - 29.4 deg, Gamma = 2.0-4.0.