Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aj....112.2667i&link_type=abstract
Astronomical Journal v.112, p.2667
Astronomy and Astrophysics
Astronomy
16
Quasars: General, X-Rays: Galaxies, Galaxies: Active
Scientific paper
The statistical properties of gamma-ray emitting AGN are discussed, based on radio sources stronger than 1 Jy at 5 GHz that have been detected by the EGRET experiment on the Compton Gamma Ray Observatory. Most strong gamma-ray sources are radio quasars; radio galaxies are a small component of the population. Among the 1 Jy quasars, gamma-ray detections have stronger than average radio flux, but are not unusually compact or flat spectrum. The redshift distributions of gamma-ray detections and nondetections are indistinguishable. The energy budget of radio quasars detected by EGRET is dominated by gamma-rays. A model is constructed where radio and gamma-ray flux densities are weakly correlated, as observed, but with a large scatter much of which may be due to variability. Using this model to fit the EGRET detection rate in the 1 Jy sample, it is predicted that the gamma-ray detections arise from the high s_y_/S_r_ tail of the radio source population, and that many radio sources must emit gamma-ray fluxes not far below the EGRET sensitivity limit. Radio quasars contribute ~50% of the diffuse extragalactic background; optically selected QSOs must contribute 5% or less. Most of the flux and variance due to unresolved point sources is contributed by radio sources in the range 0.05 < S_rad_ < 0.5 Jy. The data are broadly consistent with Doppler-boosted emission from a relativistic jet at both gamma-ray and radio wavelengths.
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