Astronomy and Astrophysics – Astronomy
Scientific paper
May 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982aipc...83..123j&link_type=abstract
IN: The galactic center, Proceedings of the Workshop, Pasadena, CA, January 7, 8, 1982 (A83-40676 19-90). New York, American Ins
Astronomy and Astrophysics
Astronomy
5
Astronomical Spectroscopy, Emission Spectra, Galactic Nuclei, Gamma Ray Astronomy, Milky Way Galaxy, Balloon Flight, Light Curve, Line Spectra, Positron Annihilation
Scientific paper
Balloon and HEAO-3 spacecraft instrumentation measurements of the .51 MeV gamma ray line arising from positron-electron annihilation near the galactic center are examined. The first balloon flights were made in 1970, and satellite data was collected in 1979. Subsequent spacecraft gamma ray spectroscopy of the region in the spring of 1980 revealed that the emission had undergone a factor of three decrease. The mean flux had displayed a value of within .19 of 1.04/1000 before the decrease was observed. The source has a luminosity of 10 to the 37th ergs/sec and an annihilation rate of 10 to the 43rd/sec. The emission region would stay within a temperature range of 100,000 K and have a diameter of 10 to the 18 cm, a mass less than 1 billion solar masses, and feature annihilations at least 10 to the 14 cm outward from the source. Further balloon flights are planned to verify the variability.
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