Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...326..717s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 326, March 15, 1988, p. 717-732.
Astronomy and Astrophysics
Astronomy
70
Galactic Radiation, Gamma Ray Astronomy, Milky Way Galaxy, Positron Annihilation, Solar Maximum Mission, Diffuse Radiation, Galactic Nuclei, Nuclear Fusion, Positrons, Temporal Distribution, Variability
Scientific paper
The γ-ray spectrometer on NASA's Solar Maximum Mission satellite (SMM) has recorded a significant increase in the measured intensity of 511 keV line radiation in each of 5 yr as the Galactic center region passed through its 130° aperture. The overall statistical significance of the detection is in excess of 30σ. Earth occultation and low-backgrond data sets are utilized to demonstrate that this annual increase is due to a celestial source. The time-averaged flux, if attributed to a point source at the Galactic center, is (2.1±0.4)×10-3γ cm-2s-1. However, it is argued that the bulk of the measured radiation arises from an extended region, and may be correlated with the Galactic distribution of interstellar matter. Possible contributors to an interstellar concentration of positrons are discussed.
Chupp Edward L.
Forrest David J.
Kinzer Robert L.
Kurfess James D.
Messina Daniel C.
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