Low-latitude galactic gamma-ray emission - A probe, not a proof

Details Low-latitude galactic gamma-ray emission - A probe, not a proof Low-latitude galactic gamma-ray emission - A probe, not a proof

Jun 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981rspta.301..555b&link_type=abstract

(Royal Society, Discussion on Gamma-Ray Astronomy, London, England, Nov. 27, 28, 1980.) Royal Society (London), Philosophical Tr

Astronomy and Astrophysics

Astronomy

7

Cosmic Rays, Galactic Radiation, Gamma Rays, Tropical Regions, Astronomical Maps, Cos-B Satellite, Diffuse Radiation, Gamma Ray Astronomy, Interstellar Matter, Shock Waves, Spaceborne Astronomy

Scientific paper

The emission of high energy (above 70 MeV) gamma rays from the galactic disc has been mapped by the COS-B mission with unprecedented detail. The results for latitudes lower than 15 deg are seen to contain evidence of structures correlated with the Galaxy on various scales, from the 'grand design' down to granularities, showing that the diffuse interstellar medium, with its cosmic ray content, is well mapped by high energy gamma-ray astronomy. Two new detailed correlations are proposed, one local and one in the medium-distance scale, to corroborate the above statement. After discussing the importance of the discrete, unresolved sources also discovered by COS-B, an astrophysical process is sketched suggesting a scenario for enhanced emission in regions where interstellar medium shocks can accelerate cosmic rays. Finally, the contribution of the nucleon and electron cosmic ray components in generating the galactic gamma rays in different energy ranges is briefly discussed, and seen to remain an open question.

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