Hard gamma radiation from the central region of the Galaxy and the diffuse background according to Cosmos 561 satellite data

Details Hard gamma radiation from the central region of the Galaxy and the diffuse background according to Cosmos 561 satellite data Hard gamma radiation from the central region of the Galaxy and the diffuse background according to Cosmos 561 satellite data

May 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978izyak..42..907b&link_type=abstract

(Vsesoiuznaia Konferentsiia po Kosmicheskim Lucham, Yakutsk, USSR, June 1977.) Akademiia Nauk SSSR, Izvestiia, Seriia Fizicheska

Astronomy and Astrophysics

Astronomy

Background Radiation, Galactic Radiation, Gamma Ray Astronomy, Milky Way Galaxy, Satellite Observation, Cosmos Satellites, Diffuse Radiation, Energy Spectra, Galactic Nuclei, Spaceborne Telescopes

Scientific paper

Results are reported for satellite observations of galactic gamma radiation performed with an acoustical-spark-chamber gamma-ray telescope. Some 7000 events were detected in a belt along the galactic equator extending from +10 to -10 deg galactic latitude and from 325 to 25 deg galactic longitude; 169 of these events met all the selection criteria for gamma rays. The flux of gamma rays with energies of at least 100 MeV from the indicated belt is determined to be approximately 0.000177 photon per sq cm/s per rad. The gamma-ray spectrum of the galactic-center region over the energy range from 100 to 700 MeV is obtained, and an integrated power-law spectral index of 1.52 + or - 0.49 is computed. An upper limit of about 0.000071 photon per sq cm/s per sr is placed on the diffuse gamma-ray background, and it is shown that the spectrum of the background can be approximated by two spectral indices: 0.8 for energies of 100 to 500 MeV and 1.8 for energies of 500 to 900 MeV.

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