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On the Nature of MeV-blazars | | Marek Sikora
; Michal Blazejowski
; Rafal Moderski
; Greg Madejski
; | | Date: |
30 May 2002 | | Journal: | Astrophys.J. 577 (2002) 78-84 | | Subject: | astro-ph | | Affiliation: | CAMK), and Greg Madejski (SLAC | | Abstract: | Broad-band spectra of the FSRQ (flat-spectrum-radio quasars) detected in the high energy gamma-ray band imply that there may be two types of such objects: those with steep gamma-ray spectra, hereafter called MeV-blazars, and those with flat gamma-ray spectra, GeV-blazars. We demonstrate that this difference can be explained in the context of the ERC (external-radiation-Compton) model using the same electron injection function. A satisfactory unification is reachable, provided that: (a) spectra of GeV-blazars are produced by internal shocks formed at the distances where cooling of relativistic electrons in a jet is dominated by Comptonization of broad emission lines, whereas spectra of MeV-blazars are produced at the distances where cooling of relativistic electrons is dominated by Comptonization of near-IR radiation from hot dust; (b) electrons are accelerated via a two step process and their injection function takes the form of a double power-law, with the break corresponding to the threshold energy for the diffusive shock acceleration. Direct predictions of our model are that, on average, variability time scales of the MeV-blazars should be longer than variability time scales of the GeV-blazars, and that both types of the blazar phenomenon can appear in the same object. | | Source: | arXiv, astro-ph/0205527 | | Services: | Forum | Review | PDF | Favorites | |
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