Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983aipc..101..211m&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
Astrophysics
13
Galactic Nuclei, Galactic Radiation, Line Spectra, Milky Way Galaxy, Positron Annihilation, Compton Effect, Energy Spectra, Gamma Rays, Photons, Radiation Distribution, X Rays
Scientific paper
The experiments that have demonstrated variability of the 511 keV positron annihilation line from the Galactic center region are reviewed. The simplest history consistent with all (but one) of the eleven measurements is that of a narrow (less than 2.5 keV FWHM), unredshifted (dE less than 0.25 keV) line, which was constant in intensity, (1.6+/-0.1)x10 to the -3d per sq cm s at earth, from before 1970 until the beginning of 1980, when it dropped to zero in less than a year. The limited evidence for detection of the continuum expected from the three-photon decay of orthopositronium is evaluated, with particular attention to the possibility of simulation by atmospheric scattering. The question of possible correlation between variations in the inverse-power-law Galactic center continuum and the strength of the 511 keV annihilation line is discussed; the evidence is inconclusive.
Leventhal Marvin
MacCallum Crawford J.
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