A diffusion model for cosmic ray propagation in the Galaxy

Details A diffusion model for cosmic ray propagation in the Galaxy A diffusion model for cosmic ray propagation in the Galaxy

Mar 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980ap%26ss..68...27w&link_type=abstract

Astrophysics and Space Science, vol. 68, no. 1, Mar. 1980, p. 27-48.

Astronomy and Astrophysics

Astronomy

5

Galactic Radiation, Interstellar Gas, Milky Way Galaxy, Particle Diffusion, Primary Cosmic Rays, Radiation Distribution, Diffusion Coefficient, Galactic Structure, Gamma Ray Astronomy, Supernova Remnants

Scientific paper

A diffusion model for the propagation of relativistic nuclear cosmic rays in the Galaxy is developed which has two nonstandard features: the escape of cosmic-ray particles from the Galaxy is simulated by a term in the diffusion equations, and an age-dependent, locally-averaged effective gas distribution. The model is fit to chemical composition data in the 0.3-5 GeV per nucleon range making it consistent with the large-scale Galactic gamma-ray data, radio halo data, energy constraints on the assumed supernova sources, and cosmic-ray anisotropy data. It is concluded that the cosmic rays are confined in a large flattened halo with a scale height in the range 3-6 kpc and an average Galactic escape time of approximately 100 million years.

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