Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983ap%26ss..93..135b&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 93, no. 1, June 1983, p. 135-140.
Astronomy and Astrophysics
Astrophysics
Diffuse Radiation, Galactic Nuclei, Galactic Radiation, Gamma Ray Spectra, Positron Annihilation, Seyfert Galaxies, Astronomical Spectroscopy, Background Radiation, Electron-Positron Plasmas, Emission Spectra, Plasma Temperature, Quasars, Radio Galaxies
Scientific paper
Observational features in the low energy γ-ray spectra of Seyfert galaxies are interpreted in terms of broad and blueshifted annihilation radiation. The possibility that this "line" emission is the underlying source of the bump in the cosmic diffuse γ-ray background is investigated. The observational data available in the literature are then used to estimate the maximum temperature of the electron positron plasma and the average positron annihilation rate for Seyfert galaxies. The assumption that other active nuclei, namely radio galaxies and quasars, are powered by the same annihilation mechanism is used to set limits on their contribution to the cosmic diffuse γ-ray background.
Bassani Loredana
Dean Anthony J.
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