Origin of diffuse galactic gamma-rays

Details Origin of diffuse galactic gamma-rays Origin of diffuse galactic gamma-rays

May 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979cosp.symp.....h&link_type=abstract

Presented at COSPAR Symp. on Gamma-Rays, Bangalore, India, 30 May - 1 Jun. 1979

Astronomy and Astrophysics

Astronomy

Cosmic Rays, Gas Density, Infrared Radiation, Radiation Sources, Transport Properties, Compton Effect, Electrons, Microwaves, Radioactive Decay

Scientific paper

Theoretical interpretations of the diffuse component of galactic gamma-rays with energies around 100 MeV are reviewed. Correlations of the gamma ray intensity with various astronomical objects indicate that the gamma ray emissivity is roughly proportional to the square of the interstellar gas density and also to the infrared emissivity. The energy spectrum of gamma rays does not show the turn over expected from the pion decay, suggesting a large contribution of the bremsstrahlung and/or Compton scattering electrons. The contribution of the latter is estimated by reference to the starlight density which is found largely through infrared observation. The contribution of localized sources to the diffuse component is discussed in connection with the star formation in dense molecular clouds.

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