GRIS Detections of the Galactic Center 511 keV Line in 1992

Details GRIS Detections of the Galactic Center 511 keV Line in 1992 GRIS Detections of the Galactic Center 511 keV Line in 1992

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...18110901t&link_type=abstract

American Astronomical Society, 181st AAS Meeting, #109.01; Bulletin of the American Astronomical Society, Vol. 24, p.1295

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Scientific paper

The Gamma-Ray Imaging Spectrometer (GRIS) was flown on balloons over Alice Springs, Australia on 1992 April 26 and May 7. A full Galactic Center transit ( ~ 10 hours) was achieved on both flights with the instrument working normally. The electron/positron annihilation line was detected on both flights. The line fluxes and line widths were (7.7 +/- 1.2) times 10(-4) and (8.9 +/- 1.1) times 10(-4) photons cm(-2) s(-1) and 1.3 +/- 0.7 and 3.6 +/- 1.0 keV respectively. These results will be compared to each other and to earlier (1988) GRIS results to produce suggestive evidence for source variability. Nearly contemporaneous GRO/OSSE Galactic Center observations indicate that the GRIS results cannot be due solely to a single point source like 1E1740.7-2942 within a few degrees of the Galactic Center. The GRIS 1992 results represent the first time that successive high resolution balloon measurements have been achieved on a time scale of days.

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