The gamma-ray spectrum of the Galactic center region

Details The gamma-ray spectrum of the Galactic center region The gamma-ray spectrum of the Galactic center region

Jul 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...294l..13r&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 294, July 1, 1985, p. L13-L15. NASA-supported resea

Astronomy and Astrophysics

Astronomy

55

Astronomical Spectroscopy, Galactic Nuclei, Gamma Ray Astronomy, Milky Way Galaxy, Positrons, Gamma Ray Spectra, Luminosity, Particle Production, Positron Annihilation

Scientific paper

The Galactic center region was observed with the HEAO 3 High Resolution Gamma-Ray Spectrometer during the fall of 1979 and the spring of 1980. Between these epochs there was observed (1) a statistically significant decrease in the high-energy (511 keV to about 3 MeV) luminosity, (2) a decrease in the positron annihilation line intensity, reported previousy, and (3) a low positronium annihilation fraction f = 0.38 + or 0.19 during the fall of 1979. If positrons are generated by photon-photon collisions of high-energy photons, then the absence of a detected flux above 511 keV in the spring of 1980 may indicate a time delay between positron production and annihilation.

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