Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...270..305b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 270, July 1, 1983, p. 305-314.
Astronomy and Astrophysics
Astronomy
14
Cosmic Rays, Emission Spectra, Galactic Radiation, Gamma Ray Astronomy, Balloon-Borne Instruments, Diffuse Radiation, Electrons, Galactic Nuclei, Gamma Ray Telescopes, Pair Production
Scientific paper
A spark chamber gamma ray telescope was developed and flown to observe diffuse gamma ray emission from the central region of the galaxy. The extension of observations down to 10 MeV provides important new data indicating that the galactic diffuse gamma ray spectrum continues as a power law down to about 10 MeV, an observation in good agreement with recent theoretical predictions. Data from other experiments in the range from 100 keV to 10 MeV show a significant departure from the extension of the power-law fit to the medium energy observations reported here, possibly indicating that a different mechanism may be responsible for the emissions below and above a few MeV. The intensity of the spectrum above 10 MeV implies a galactic electron spectrum which is also very intense down to about 10 MeV. Electrons in this energy range cannot be observed in the solar cavity because of solar modulation effects. The galactic gamma ray data are compared with recent theoretical predictions. Previously announced in STAR as N83-17444
Bertsch David L.
Kniffen Donald A.
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