Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993adspr..13..587g&link_type=abstract
Advances in Space Research (ISSN 0273-1177), vol. 13, no. 12, p. (12)587-(12)596
Astronomy and Astrophysics
Astronomy
9
Active Galactic Nuclei, Astronomical Models, Gamma Ray Astronomy, Jet Flow, Luminosity, Magnetic Energy Storage, Quasars, Synchrotron Radiation, Compton Effect, Electron-Positron Pairs, Gamma Ray Observatory, Relativity, Stellar Magnetic Fields
Scientific paper
The recent detection of radio loud quasars with a large high energy gamma-ray luminosity is discussed, in the framework of non-thermal synchrotron self Compton models. These observations are strong evidence of relativistic beaming of the radiation, due to the absence of strong photon-photon opacity. If gamma-rays are self Compton emission, these sources can be the first observed example of a Compton catastrophe, resulting from the dominance of the radiation over the magnetic energy density. Inhomogeneous and relativistic jet models can in this case explain the observed spectrum from the far infrared to the gamma-rays. If, on the other hand, the magnetic energy density is dominant, then the gamma-rays must be due to direct synchrotron emission, implying very large particle energies. Pure synchotron models which take into account electron-positron pair production are then discussed. Multifrequency simultaneous observations are a powerful test of the models.
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