Astronomy and Astrophysics, volume 352, 32-38 (1999/12-1)
Basic properties of gamma-ray loud blazars.
CHENG K.S., FAN J.H. and ZHANG L.
Abstract (from CDS):
In this paper, a method is proposed to determine the basic properties of γ-ray loud blazars, among them the central black hole mass, M, the Doppler factor, δ, the propagation angle of the γ-rays with respect to the symmetric axis of a two-temperature accretion disk, Φ, and the distance (i.e. the height above the accretion disk), d at which the γ-rays are created, for seven γ-ray loud blazars with available GeV variability timescales and in which the absorption effect of a γ-ray and the beaming effect have been taken into account. Our results indicate that, if we take the intrinsic γ-ray luminosity to be λ times the Eddington luminosity, Lγin=λLEdd., the masses of the blazars are in the range of (4∼83)x107M☉ (λ=1.0) or (6∼131)x107M☉ (λ=0.1), the Doppler factors (δ) lie in the range of 0.57 to 3.72 (λ=1.0) or 0.79 to 5.33 (λ=0.1), the angle (Φ) is in the range of 14° to 43° (λ=1.0) or 13° to 39° (λ=0.1), and the distance (d) is in the range of 28Rg to 411Rg (λ=1.0) or 26Rg to 366Rg (λ=0.1). For 3C279, the case of a uniformly-bright disk is also adopted to determine the basic parameters, which are compared with those obtained for a two-temperature disk as well as those obtained by Becker & Kafatos (1995). Our model results are independent of γ-ray emission mechanisms but they do depend on the X-ray emission mechanism of the accretion disk.
galaxies: BL Lacertae objects: general - galaxies: jets - galaxies: quasars: general - gamma rays: observations
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