Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aipc..220..172s&link_type=abstract
In: High energy gamma-ray astronomy; Proceedings of the International Conference, Ann Arbor, MI, Oct. 2-5, 1990 (A93-25001 08-93
Astronomy and Astrophysics
Astronomy
Cosmic Ray Showers, Diffuse Radiation, Energy Spectra, Gamma Ray Astronomy, Milky Way Galaxy, Background Radiation, Radiation Distribution
Scientific paper
The physics of Galactic and extragalactic gamma rays in the PeV region is discussed, and their detectability by shower arrays is evaluated. Both the Galactic and the extragalactic component of the diffuse gamma-ray fluxes are found to yield fluxes about 100,000 times smaller than the cosmic ray flux at 100 TeV. The main distinction between the two diffuse sources is their angular spread. While extragalactic gamma rays are expected to be truly isotropic, Galactic ones are concentrated in the region of the Galactic plane. Using the muon content of the showers, conventional shower arrays might be able to detect gamma-ray fluxes of that magnitude independently of the behavior of the photoproduction cross section at very high energies.
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