Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...212...60s&link_type=abstract
Astrophysical Journal, Part 1, vol. 212, Feb. 15, 1977, p. 60-70.
Astronomy and Astrophysics
Astronomy
82
Galactic Radiation, Galactic Structure, Gamma Rays, Milky Way Galaxy, Spaceborne Astronomy, X Ray Astronomy, Compton Effect, Cos-B Satellite, Galactic Nuclei, Interstellar Gas, Pions, Radial Distribution, Radiation Distribution, Sas-2, Satellite Observation
Scientific paper
The status of our knowledge on galactic gamma-rays and the large-scale distribution of cosmic rays and interstellar gas in the Galaxy is reviewed and reexamined on the basis of new data obtained by the SAS-2 satellite and the European COS-B satellite. To facilitate discussion, the concepts of four galactic regions of various thickness - the nebulodisk, ectodisk, radiodisk, and exodisk - are defined. Bremsstrahlung and pion-decay gamma-rays are associated with the first two regions, and Compton gamma-rays and synchrotron radiation with the latter two. The galactic contribution to the observed high-latitude gamma-ray background is evaluated and is shown to account reasonably for the observed spectrum at high latitudes between 35 and 200 MeV when added onto the extragalactic background.
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