Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975mnras.171..569d&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 171, June 1975, p. 569-577. Research supported by the Science Research
Astronomy and Astrophysics
Astronomy
75
Cosmic Rays, Galactic Radiation, Gamma Rays, Milky Way Galaxy, Radiation Sources, Astronomical Models, H Ii Regions, Hydrogen Atoms, Proton Flux Density, Radiant Flux Density, Spatial Distribution, Supernova Remnants
Scientific paper
Recent experimental data on gamma-ray fluxes toward the galactic anticenter are examined to determine whether cosmic rays of about 3 GeV originate within the galaxy or are of extragalactic origin. Galactic sources considered include supernovae remnants and H II regions, and the model adopted for extragalactic origin assumes that the galaxy is bathed in a uniform flux of extragalactic protons. Values of the gamma-ray intensities are calculated for galactic regions using the natural hydrogen distribution from 21-cm data, and predicted distributions for extragalactic origin are derived from the column densities in extragalactic directions. Latitude and longitude distributions are calculated for the two models, and the extragalactic model is found to predict a flux in excess of observed values by about a factor of two. It is concluded that a plausible galactic origin model, based on a distribution of sources following that of supernovae remnants and the mass density in general, can give a good quantitative explanation of the gamma-ray fluxes from the galactic anticenter.
Dodds D.
Strong Andrew W.
Wolfendale Arnold W.
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