SIMBAD references

1997A&A...326...51P - Astronomy and Astrophysics, volume 326, 51-58 (1997/10-1)

A spectral study of gamma-ray emitting active galactic nuclei.


Abstract (from CDS):

In this paper we present a statistical analysis of the γ-ray spectra of flat-spectrum radio quasars (FSRQ) compared to those of BL Lacs. The average spectra and possible systematic deviations from power-law behaviour are investigated by summing up the intensity and the power-law fit statistic for both classes of objects. We also compare the time-averaged spectrum to that at the time of γ-ray outbursts. The spectrum of the average AGN is softer than that of the extragalactic γ-ray background. It may be that BL Lacs, which on average have a harder spectrum than FSRQs, make up the bulk of the extragalactic background. We also find apparent cut-offs at both low and high energies in the spectra of FSRQs at the time of γ-ray outbursts. While the cut-off at high energies may have something to do with opacity, the cut-off at low energies may be taken as indication that the γ-ray emission of FSRQs is not a one component spectrum.

Abstract Copyright:

Journal keyword(s): methods: statistical - BL Lacertae objects: general - quasars: general - Gamma-rays: observations

Simbad objects: 44

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