Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.260l..21p&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 260, no. 3, p. L21-L24.
Astronomy and Astrophysics
Astronomy
90
Active Galactic Nuclei, Background Radiation, Extraterrestrial Radiation, Gamma Ray Astronomy, Bl Lacertae Objects, Diffuse Radiation, Quasars, Radio Sources (Astronomy)
Scientific paper
We estimate the contribution of radio-loud active galactic nuclei to the gamma-ray background using the recent detections by GRO of BL Lacs and flat-spectrum radio quasars at energies about 100 MeV. From the recently derived radio luminosity functions of these objects, together with the observed mean values of the gamma-ray to radio luminosity, we derive contributions of about 30 and 35 per cent, respectively, at 100 MeV. The total contribution of radio-loud sources is 66+31 or -24 per cent, leaving little room for a substantial contribution from radio-quiet active galactic nuclei, none of which has been detected so far. Our results assume that the detected sources are typical of the radio-loud population and not strongly variable; further gamma-ray detections and variability studies should allow a refinement of our estimate.
Celotti Annalisa
Fabian Andrea C.
Ghisellini Gabriele
Padovani Paolo
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