Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...230..597h&link_type=abstract
Astrophysical Journal, Part 1, vol. 230, June 1, 1979, p. 597-606.
Astronomy and Astrophysics
Astronomy
79
Galactic Radiation, Gamma Ray Astronomy, Milky Way Galaxy, Radiation Distribution, Diffuse Radiation, Energetic Particles, Energy Spectra, Galactic Structure, Sas-2
Scientific paper
Analysis of the SAS 2 data together with the COS B results shows that the distribution of galactic gamma-radiation has several similarities to that of other large-scale tracers of galactic structure. The radiation is primarily confined to a thin disc which exhibits offsets from b = 0 degrees similar to warping at radio frequencies. The principal distinction of the gamma-radiation is a stronger contrast in intensity between the region from 310 to 45 degrees in longitude and the regions away from the center that can be attributed to a variation in cosmic-ray density as a function of position in Galaxy. The diffuse galactic gamma-ray energy spectrum shows no significant variation in direction, and the spectrum seen along the plane is the same as that for the galactic component of the gamma-radiation at high altitudes. The uniformity of the galactic gamma-ray spectrum, the smooth decrease in intensity as a function of altitude, and the absence of any galactic gamma-ray sources at high altitudes indicate a diffuse origin for bulk of the galactic gamma-radiation rather than a collection of localized sources.
Fichtel Carl E.
Hartman Robert C.
Kniffen Donald A.
Ogelman Hakki B.
Ozel Mehmet Emin
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