Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...208..211f&link_type=abstract
Astrophysical Journal, vol. 208, Aug. 15, 1976, pt. 1, p. 211-219.
Astronomy and Astrophysics
Astronomy
32
Cosmic Rays, Cosmic X Rays, Gamma Rays, X Ray Astronomy, Energy Spectra, Primary Cosmic Rays, Radiation Distribution, Secondary Cosmic Rays
Scientific paper
The paper examines the medium-energy (about 10-30 MeV) galactic gamma-ray radiation from primary and secondary electrons and calculates the expected gamma-ray distribution for the specific model of Bignami et al. (1975) on the assumption that the cosmic rays are correlated with the matter on the scale of galactic arms. The energy spectrum typical of regions near the galactic center indicates a dramatic shift from a predominantly cosmic-ray nucleonic mechanism at higher energies to a cosmic-ray electron mechanism at the lower energies. This provides a most important and direct means of probing the cosmic-ray electrons as a function of galactic position by making gamma-ray observations in the few to 40 MeV energy range. Medium-energy gamma-ray astronomy is shown to be a valuable tool in galactic research.
Bignami Giovanni F.
Cheung Chi-Yee
Fichtel Carl E.
Kniffen Donald A.
Thompson Daniel J.
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