Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-01-30
Astronomy and Astrophysics
Astrophysics
3 pages, 4 figures, poster presented at the conference "New visions of the X-ray Universe in the XMM Newton and Chandra Era",
Scientific paper
We demonstrate that the spectral differences between Flat Spectrum Radio Quasars (FSRQ) with steep gamma-ray spectra (MeV-blazars) and FSRQ with flat gamma-ray spectra (GeV-blazars) can be explained by assuming that in the MeV-blazars, the production of gamma-rays is dominated by Comptonization of infrared radiation of hot dust, whereas in the GeV-blazars -- by Comptonization of broad emission lines. Additional ingredient, required to reach satisfactory unification, is an assumption that the radiating electrons are accelerated via a two step process, in the lower energy range -- following instabilities driven by shock-reflected ions, and in the higher energy range -- via resonant scatterings off Alfven waves. Our model predicts that on average, the MeV-blazars should vary on longer time scales than GeV-blazars.
Blazejowski Michal
Madejski Greg
Moderski Rafal
Sikora Marcin
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