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Basic properties of Gamma-ray loud blazars | | K.S. Cheng
; J.H. Fan
; L. Zhang
; | | Date: |
29 Oct 1999 | | Subject: | astro-ph | | Affiliation: | Dept. of Phys. HKU), J.H. Fan (CfA, GNU), L. Zhang (Dept. of Phys. HKU | | Abstract: | In this paper, a method is proposed to determine the basic properties of $gamma$-ray loud blazars, among them the central black hole mass, M, the Doppler factor, $delta$, the propagation angle of the $gamma$-rays with respect to the symmetric axis of a two-temperature accretion disk, $Phi$, and the distance (i.e. the height above the accretion disk), d at which the $gamma$-rays are created, for seven $gamma$-ray loud blazars with available GeV variability timescales and in which the absorption effect of a $gamma$-ray and the beaming effect have been taken into account. Our results indicate that, if we take the intrinsic $gamma$-ray luminosity to be $lambda$ times the Eddington luminosity, $L_{gamma}^{in} = lambda L_{Edd.}$, the masses of the blazars are in the range of $(4 sim 131) imes 10^{7}M_{odot}$, the Doppler factors ($delta$) lie in the range of 0.57 to 5.33 the angle ($Phi$) is in the range of $13^{circ}$ to 43$^{circ}$ and the distance (d) is in the range of 26R_{g} to 411R_{g}. Our model results are independent of $gamma$-ray emission mechanisms but they do depend on the X-ray emission mechanism of the accretion disk. | | Source: | arXiv, astro-ph/9910543 | | Services: | Forum | Review | PDF | Favorites | |
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