Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-10-20
Astronomy and Astrophysics
Astrophysics
5 pages, A&AS, 136, 13-18 (1999)
Scientific paper
10.1051/aas:1999194
In this paper, The central black hole masses and the Doppler factors are derived for PKS 0528+134, PKS 0537-441, 3C279, PKS 1406-074, PKS 1622-297, Q1633+382, Mkn 501, and BL Lacertae. The masses obtained are in the range of (1 -7)$\times 10^{7}M_{\odot}$ and compared with that obtained with the Klein-Nishina cross section considered (Dermer & Gehrels 1995). If we considered only the Thomson cross section, the masses are in the range of 2.6$\times 10^{6}M_{\odot}$ - 2$\times 10^{11}M_{\odot}$. 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 3C279 are almost the same. For 3C279 and BL Lacertae, viewing angle, $\theta$, and Lorentz factor, $\Gamma$, are estimated from the derived Doppler factor and the measured superluminal velocity. For 3C279, $\theta = 10^{\circ}.9-15^{\circ}.6$, $\Gamma$ = 2.4-14.4 for $\delta$ = 3.37; $\theta = 8^{\circ}.45-9^{\circ}.7$, $\Gamma$ = 2.95-11.20 for $\delta$ = 4.89; For BL Lacertae, $\theta = 25^{\circ}-29^{\circ}.4$, $\Gamma$ = 2.0-4.0.
Bacon Roland
Fan Junhui H.
Xie G.-Zh.
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