Physics
Scientific paper
Aug 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983icrc....9...73b&link_type=abstract
IN: International Cosmic Ray Conference, 18th, Bangalore, India, August 22-September 3, 1983, Late Papers. Volume 9 (A85-22801 0
Physics
Cosmic Rays, Galactic Structure, Gamma Ray Spectra, Milky Way Galaxy, Radial Distribution, Radiant Flux Density, Spectral Energy Distribution, Electron Distribution, Emission Spectra
Scientific paper
The gamma ray emissivity spectrum is derived for three distance ranges in the second and third galactic quadrants and is discussed in terms of the contribution from bremsstrahlung and pi(0) decay and of the distribution of cosmic rays. The radial distribution of gamma ray emissivities for different energy ranges is used to determine the radial distribution of cosmic ray electrons and protons separately. The overall shape of the local gamma ray emissivity spectrum indicates that gamma ray emission in the 70-150 MeV range is predominantly due to bremsstrahlung of electrons. A decrease of the emissivity is detected in the low energy range, implying that there is a galactocentric gradient in the cosmic ray electron density for electrons less than 300 MeV. If a similar decrease occurs in the higher-energy electron distribution, the fact that there is no detectable gradient for the high-energy gamma-ray emissivities suggests that interactions of cosmic ray nucleons with gas must dominate at these energies and the nucleon density must be constant out to large distances.
Bennett Kevin
Bignami Giovanni F.
Blitz Leo
Bloemen Johannes Bernardus Gerhardus Maria
Caraveo Patricia A.
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