Large-scale structure of the galaxy and high-energy gamma-ray observations

Astronomy and Astrophysics – Astronomy

Scientific paper

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Galactic Radiation, Galactic Structure, Gamma Ray Astronomy, Milky Way Galaxy, Spaceborne Astronomy, Astronomical Models, Cos-B Satellite, Cosmic Rays, Interstellar Gas, Sas-2

Scientific paper

A discussion is presented concerning the consistency of data on the Galaxy's high energy gamma-ray emission that have been gathered by the SAS-2 and COS-B satellite missions. A few distinct discrepancies are noted to imply time variations within the compact source component of the total galactic emission. The bulk of emission seems well correlated with the total interstellar gas column density. The gamma-ray observations exclude any domination in the inner Galaxy of H2, and no significant galactocentric gradient of the high energy cosmic-ray flux density is suggested inside the solar circle. The systematic variation of the gamma-ray emission spectrum with longitude suggests an increased cosmic ray electron flux in the 100 MeV to 1 GeV energy range, in regions where dense clouds are concentrated. The variation may also be due to the unresolved compact gamma ray object population.

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