Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...217..843s&link_type=abstract
Astrophysical Journal, Part 1, vol. 217, Nov. 1, 1977, p. 843-851, 853-858.
Astronomy and Astrophysics
Astronomy
54
Cosmic Rays, Galactic Structure, Gamma Ray Astronomy, Halos, Milky Way Galaxy, Confidence Limits, Interstellar Gas, Pulsars, Radiant Flux Density, Relativistic Particles, Statistical Analysis, Supernova Remnants
Scientific paper
Recent satellite observations of the distribution of galactic 100-MeV gamma rays and their interpretation are used as an independent test of the existence and extent of a cosmic-ray halo around the Galaxy. The cosmic-ray halo is defined, uniform and diffusion halo models are described, and the flat diffusion model is employed to investigate the effect of a diffusion halo on the galactic cosmic-ray distribution. Cosmic-ray source distributions that are perpendicularly uniform functions of galactocentric distance are adopted in the analysis. Possible longitudinal distributions of the gamma-ray line flux from neutral-pion decay are evaluated and compared with the fluxes observed by SAS-2 for goodness of fit. The results are shown to be consistent with a thick-disk or thin-halo model having a mean half-thickness of 1 to 3 kpc.
Jones Frank C.
Stecker Floyd W.
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