Gamma rays from the cosmic ray irradiation of local molecular clouds

Details Gamma rays from the cosmic ray irradiation of local molecular clouds Gamma rays from the cosmic ray irradiation of local molecular clouds

Aug 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981natur.292..430i&link_type=abstract

Nature, vol. 292, July 30-Aug. 5, 1981, p. 430-433.

Physics

52

Cosmic Rays, Gamma Rays, Molecular Clouds, Milky Way Galaxy, Radiant Flux Density

Scientific paper

An analysis of the flux of cosmic gamma rays above 100 MeV from 13 local molecular clouds is presented, and possible reasons for the excesses are considered. It is shown that only in a few clouds does the cosmic ray intensity need to exceed the value near the earth to explain the gamma ray fluxes. Unidentified molecular clouds irradiated by CR, and beyond 2 kpc are found to be possible sources, with indications that approximately 60 percent of the COS B sources can be explained this way. In addition, the presence of large scale cosmic ray gradients in the Galaxy is considered, and low energy cosmic ray sources are suggested to be particles distributed rapidly so that interaction in a particular cloud is from general ambient cosmic radiation.

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