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 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983aipc..101..230r&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

6

Galactic Nuclei, Gamma Ray Spectra, Heao 3, Positron Annihilation, Spectrum Analysis, Galactic Radiation, Gamma Ray Astronomy, Gamma Ray Spectrometers

Scientific paper

The HEAO-3 High Resolution Gamma-Ray Spectrometer observed the Galactic center region in fall 1979 and in the spring of 1980. Variation of the positron annihilation line at 511 keV has been reported previously. The fall 1979 observations show a significant high-energy continuum at energies above 511 keV. The intensity of a possible positronium triplet-state continuum is found to be less than that expected for direct positron annihilation and positronium decay in an ionized, warm (T approximately equal to or less than 10 to the 5th K) plasma. Depending on assumption for the shape of the high-energy continuum spectrum, positronium fractions between 0.0 and 0.75 (at 90 percent statistical confidence level) are consistent with the observations.

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