Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...326...51p&link_type=abstract
Astronomy and Astrophysics, v.326, p.51-58
Astronomy and Astrophysics
Astrophysics
27
Methods: Statistical, Bl Lacertae Objects: General, Quasars: General, Gamma-Rays: Observations
Scientific paper
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.
Hartman Robert C.
Jones Barbara
Pohl Mario
Sreekumar Parameswaran
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