The radial distribution of galactic gamma rays. II - The distribution of cosmic-ray electrons and nuclei in the outer galaxy

Details The radial distribution of galactic gamma rays. II - The distribution of cosmic-ray electrons and nuclei in the outer galaxy The radial distribution of galactic gamma rays. II - The distribution of cosmic-ray electrons and nuclei in the outer galaxy

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...135...12b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 135, no. 1, June 1984, p. 12-22. Research supported by the University of Maryl

Physics

Nuclear Physics

51

Galactic Cosmic Rays, Gamma Ray Astronomy, Gamma Ray Spectra, High Energy Interactions, Interstellar Gas, Milky Way Galaxy, Cos-B Satellite, Electron Density (Concentration), Emission Spectra, High Energy Electrons, Nuclei (Nuclear Physics), Radial Distribution

Scientific paper

In the present derivation of the radial distribution of high energy gamma-ray emissivity in the outer Milky Way, the kinematics of H I are used to construct column-density maps in various galactocentric distance ranges that are then used in combination with COS-B spacecraft gamma-ray data to determine emissivities in these distance ranges. The results obtained imply a hardening of the gamma-ray spectrum with increasing distance, and include an energy-dependent decrease that is interpreted as a steep gradient in the cosmic-ray electron density and a near constancy of the nuclear component. The galactic origin of electrons with energies of up to several hundreds of MeVs is confirmed.

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