Diffuse gamma radiation

Details Diffuse gamma radiation Diffuse gamma radiation

Jun 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...222..833f&link_type=abstract

Astrophysical Journal, Part 1, vol. 222, June 15, 1978, p. 833-849.

Astronomy and Astrophysics

Astronomy

162

Diffuse Radiation, Energy Spectra, Galactic Radiation, Gamma Rays, Radiant Flux Density, Radiation Distribution, Astronomical Models, Galactic Structure, Hydrogen Clouds, Milky Way Galaxy, Spaceborne Astronomy, Spatial Distribution, Spectral Energy Distribution

Scientific paper

Results are reported for an investigation of the intensity, energy spectrum, and spatial distribution of the diffuse gamma radiation detected by SAS 2 away from the galactic plane in the energy range above 35 MeV. The gamma-ray data are compared with relevant data obtained at other wavelengths, including 21-cm emission, radio continuum radiation, and the limited UV and radio information on local molecular hydrogen. It is found that there are two quite distinct components to the diffuse radiation, one of which shows a good correlation with the galactic matter distribution and continuum radiation, while the other has a much steeper energy spectrum and appears to be isotropic at least on a coarse scale. The galactic component is interpreted in terms of its implications for both local and more distant regions of the Galaxy. The apparently isotropic radiation is discussed partly with regard to the constraints placed on possible models by the steep energy spectrum, the observed intensity, and an upper limit on the anisotropy.

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