Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983aipc..101..303m&link_type=abstract
IN: Positron-electron pairs in astrophysics; Proceedings of the Workshop, Greenbelt, MD, January 6-8, 1983 (A85-31276 13-90). Ne
Astronomy and Astrophysics
Astronomy
4
Active Galaxies, Galactic Nuclei, Galactic Radiation, Gamma Ray Astronomy, Positron Annihilation, Radiation Sources, Gamma Ray Spectrometers, Heao 3, Spaceborne Astronomy
Scientific paper
Mildly active galaxies are examined as possible sources of 511-keV line radiation resulting from electron-positron annihilations. Observations of seven galaxies of various types are made using an HEAO-3 gamma-ray spectrometer. It is shown that none of the galaxies are detected in the 511 keV line and therefore the proposed scaling law for 511-keV line emission from the galactic nuclei is not valid. The results indicate that the scaling overestimates the 511-keV line flux by a factor of 3 or more. Possible causes of this discrepancy are considered. The expected values of and the observed 2.3-sigma upper limits to the 511-keV line flux for each source and the Galactic Center are presented in a table.
Brecher Kenneth
Jacobson Seth A.
Ling James C.
Mahoney William A.
Marscher Alan P.
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