Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...271..804e&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 271, Aug. 15, 1983, p. 804-819.
Astronomy and Astrophysics
Astronomy
44
Accretion Disks, Black Holes (Astronomy), Gamma Ray Astronomy, Gamma Ray Spectra, High Energy Interactions, High Temperature Plasmas, Astronomical Models, Galactic Nuclei, Particle Acceleration, Particle Production, Pions, Relativistic Particles, Stellar Mass Accretion
Scientific paper
Detailed photon and particle spectra are presented for specific disk models. The predicted gamma-ray flux can be as much as 10 percent of the bolometric luminosity in sub-Eddington models. It is noted that most of the gamma radiation is continuous, owing to the pi(0) decay; this is emitted around 100 MeV but is degraded to a few MeV in optically thick models. Owing to positon annihilation or to excited nuclei, spectral lines provide only a small amount of the primary gamma-ray luminosity. The energy flux in approximately 35 MeV pairs is found to be comparable to the gamma-ray luminosity. Penrose effects provide a smaller number of approximately 1 GeV pairs. Applications of the model to both galactic and extragalactic sources are discussed. Both the galactic center gamma-ray source and the extragalactic gamma-ray background (if due to discrete sources) may derive from this type of model.
Eilek J. a.
Kafatos Menas
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