Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985icrc....9...93s&link_type=abstract
Proceedings from the 19th International Cosmic Ray Conference, Volume 9 (Invited Talks), p.93
Astronomy and Astrophysics
Astronomy
Balloon-Borne Instruments, Gamma Ray Bursts, Satellite-Borne Instruments, Spaceborne Astronomy, Astronomical Models, Intergalactic Media, Line Spectra, Spatial Distribution, Supernova Remnants
Scientific paper
Satellite and balloon observations of cosmic gamma rays are summarized. The MeV-emission of gamma ray bursts is a common feature. Variations in duration and energy spectra from burst to burst may explain the discrepancy between the measured log N-log S dependence and the observed isotropy of bursts. The gamma ray line at 1.809 MeV from A26 is the first detected line from a radioactive nucleosynthesis product. To understand its origin it is necessary to measure its longitude distribution in the Milky Way. Indication of a gamma ray excess from the direction of Loop I is consistent with the picture that the bulk of cosmic rays below 100 GeV is produced in galactic supernova remnants. The interpretation of the large scale distribution of gamma rays in the Milky Way is controversial. An extragalactic origin of the cosmic ray nuclei in the GeV-range cannot be excluded from the gamma ray data. The detection of MeV-emission from Cen A is a promising step towards extragalactic gamma ray astronomy.
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