Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...407..597g&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 407, no. 2, p. 597-605.
Astronomy and Astrophysics
Astronomy
23
Galactic Nuclei, Galactic Structure, Gamma Ray Astronomy, Milky Way Galaxy, Astronomical Spectroscopy, Emission Spectra, Gamma Ray Spectra, Heao 1, Point Sources, Spaceborne Astronomy
Scientific paper
Spectral measurements of the emission from the disk of the Galaxy from keV to GeV energies are combined. It is found that this emission has a similar spatial distribution at all energies: a longitude extent of about +/-40 deg and a latitude extent of about less than 5 deg. The emission over most of the energy range is dominated by cosmic-ray electrons and protons interacting with interstellar matter. The ridge spectrum is estimated to be near 100 keV using observations by HEAO A-4 from 1977 to 1979. To determine the emission from point sources in the region the diffuse component is substracted from Galactic center observations made by wide-field gamma-ray instruments over the past 20 years. The Galactic ridge accounts for between one-third and one-half of the observed flux for most of the measurements. Substracting the diffuse emission and GRS 1758-258 emission from the HEXAGONE observations on May 22 gives a spectrum that is dominated by lines from positron annihilation.
Gehrels Neil
Tueller Jack
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