High-energy galactic gamma radiation from cosmic rays concentrated in spiral arms

Details High-energy galactic gamma radiation from cosmic rays concentrated in spiral arms High-energy galactic gamma radiation from cosmic rays concentrated in spiral arms

Jul 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...199...54b&link_type=abstract

Astrophysical Journal, vol. 199, July 1, 1975, pt. 1, p. 54-60.

Astronomy and Astrophysics

Astronomy

58

Cosmic Rays, Galactic Radiation, Galactic Structure, Gamma Rays, High Energy Interactions, Interstellar Gas, Astronomical Models, H Ii Regions, Milky Way Galaxy, Radiant Flux Density, Spaceborne Astronomy

Scientific paper

A model for the emission of high-energy (exceeding 100 Mev) gamma-rays from the galactic disk has been developed and compared with recent SAS-2 observations. In the calculation, it is assumed that (1) the high energy galactic gamma-rays result primarily from the interaction of cosmic rays with galactic matter, (2) the cosmic-ray density is proportional to the matter density on the scale of galactic arms, and (3) the matter in the Galaxy is distributed in a spiral pattern consistent with density-wave theory and experimental data on the matter distribution that is available, including the 21-cm H I line emission, continuum emission from H II regions, and data currently being used to estimate the H2 density. The calculated galactic-longitude distribution of gamma rays is in good agreement with the SAS-2 observations in relative shape and absolute flux. As a corollary, the nonuniform cosmic-ray distribution of this model tends to support the galactic origin of the fraction of cosmic rays which is important in the production of high-energy photons. Modifications of the basic model show that the gamma-ray flux is relatively sensitive to large variations of the assumed distribution of molecular hydrogen in the Galaxy.

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