Spectral Variability in PKS 0528+134 at Gamma-Ray Energies

Details Spectral Variability in PKS 0528+134 at Gamma-Ray Energies Spectral Variability in PKS 0528+134 at Gamma-Ray Energies

1997-11-04

arxiv.org/abs/astro-ph/9711032v1

Astronomy and Astrophysics

Astrophysics

Accepted for publication as Letter in A&A; 4 pages, 4 figures; uses epsf.sty, rotate.sty

Scientific paper

We present model calculations to the observed spectral variability in the gamma-ray spectrum of the ultraluminous blazar-type quasar PKS 0528+134. We argue that the observed appearance of a spectral break between the COMPTEL and the EGRET energy range can plausibly be explained by a variation of the Doppler beaming factor in the framework of a relativistic jet model for AGNs, combining the ERC and the SSC model. This may be an instructive example for the different dependence of these two spectral components on the Doppler factor, as predicted in earlier work.

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