Origin of Diffuse Galactic Gamma-Rays
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概要
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Theoretical interpretations of the diffuse component of galactic gamma-rays with energies around 100 MeV are reviewed, on account of that these gamma-rays are generated by three mechanisms, the 2γ-decay of neutral pions produced by the collision of the nuclear component of cosmic rays with interstellar matter, the bremsstrahlung of cosmic-ray electrons, and the Compton scattering of cosmic-ray electrons by cosmic microwaves and starlight. 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 large through infrared observation. The contribution of localized sources to the diffuse component is idscussed in connection with the star formation in dense molecular clouds.
- 核融合科学研究所の論文
著者
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Hayakawa Satio
Department Of Astrophysics Faculty Of Science Nagoya University
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Hayakawa Satio
Department Of Physics And Astrophysics And Institute Of Plasma Physics Nagoya University
関連論文
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