Absorption of gamma rays in active galaxies as a test of the jet hypothesis

Details Absorption of gamma rays in active galaxies as a test of the jet hypothesis Absorption of gamma rays in active galaxies as a test of the jet hypothesis

Nov 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981natur.294..332b&link_type=abstract

Nature, vol. 294, Nov. 26, 1981, p. 332, 333. Research supported by the British Council.

Astronomy and Astrophysics

Astronomy

19

Active Galaxies, Galactic Radiation, Gamma Ray Absorption, Gamma Ray Astronomy, Annihilation Reactions, Bl Lacertae Objects, Electron-Positron Pairs, Quasars, X Ray Astronomy

Scientific paper

The attenuation of gamma rays as a result of pair-production in photon-photon collisions with X rays is examined, assuming that gamma and X rays originate in the same volume in the nucleus of active galaxies. It is shown that while Seyfert galaxies are transparent to gamma radiation up to above 1 GeV, quasars and BL Lacertae objects are opaque around 1 MeV. The detection of gamma rays from quasars and BL Lacertae objects is explained if a gamma and X ray emission is assumed from annihilation of electron-positron pairs, producing 511 eV radiation, which is not absorbed by an X ray-photon field. Observed continuity in the spectral emission of QSO 3C273 implies a beam of collimated energy, which progressively dominates the isotropic emission as the angle between the observer and the jet (beam) axis decreases. It is concluded that different types of observed active galaxies differ only in orientation with respect to the earth, rather than in internal structure.

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