Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982vheg.work..298f&link_type=abstract
Very High Energy Gamma Ray Astronomy, Proceedings of the International Workshop held 20-25 September, in Ootacamund, India. Edit
Astronomy and Astrophysics
Astronomy
Cosmic Rays, Diffuse Radiation, Galactic Radiation, Gamma Rays, High Energy Interactions, Black Body Radiation, Bremsstrahlung, Energy Spectra, Interstellar Matter, Spatial Distribution
Scientific paper
Assuming cosmic rays pervade the Galaxy, they necessarily produced high energy gamma-rays as they interact with the instellar matter and photons. The cosmic ray nucleon interactions five rise to gamma rays primarily through the decay of pi mesons, giving a unique spectrum with a maximum at approximately 68 MeV. Cosmic ray electrons produce gamma rays through bremsstrahlung, but with a markedly different energy spectral shape, one which decreases monotonically with energy. Cosmic ray electrons also interact with the interstellar starlight, optical and infrared photons, and the blackbody radiation through the Compton process. A model of galactic gamma ray production is discussed, and the predicted spatial distribution and energy spectra are presented. Considering the uncertainty in the point source contributions, the agreement between the theoretical predictions and the gamma ray data seems quite reasonable.
Fichtel Carl E.
Kniffen Donald A.
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