Gamma radiation from radio shocks in AGN jets

Details Gamma radiation from radio shocks in AGN jets Gamma radiation from radio shocks in AGN jets

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...297l..13v&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 297, no. 1, p. L13-L16

Astronomy and Astrophysics

Astronomy

43

Active Galactic Nuclei, Active Galaxies, Gamma Ray Astronomy, Gamma Rays, Quasars, Radio Astronomy, Radio Bursts, Gamma Ray Observatory, Radio Jets (Astronomy)

Scientific paper

We compare the Phase 1 gamma-ray detections and nondetections of active galactic nuclei by the EGRET instrument of Compton Gamma Ray Observatory with Metsahovi 22 GHz and 37 Ghz radio flux curves. We find a good correlation between the type of the source, the radio state of the source, and the gamma-ray emission. With few exceptions, gamma-rays are detected when, and only when, a quasar with high optical polarization is in the initial phases of a high radio frequency outburst. Other types of sources - low polarization quasars, BL Lac objects, radio galaxies - are rarely detected in gamma-rays, even when in a similar state of radio activity. Our results limit viable gamma-ray production mechanisms to those involving strongly beamed gamma-rays from radio-emitting shocks in jets oriented close to our line of sight.

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