Other
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...18311606s&link_type=abstract
American Astronomical Society, 183rd AAS Meeting, #116.06; Bulletin of the American Astronomical Society, Vol. 25, p.1467
Other
Scientific paper
An emission feature near 170 keV, interpreted as Compton-backscattered positron annihilation radiation, has been observed twice by balloon-borne germanium spectrometers from within ~ 15deg of the Galactic Center (Leventhal et al. 1978, ApJ 225,L11; Smith et al. 1993, ApJ 414,165). Upper limits on this feature set by HEAO-3 (Mahoney et al. 1993, A&AS 97,159) and other instruments indicate that it must be transient. A transient backscatter feature, along with unscattered annihilation radiation, was observed from Nova Muscae by SIGMA (Goldwurm et al. 1992, ApJ 389,L79), with a duration of a few hours. The Oriented Scintillation Spectrometer Experiment (OSSE) on the Compton Gamma Ray Observatory is particularly well-suited to search for such a feature. Since its launch in 1991, the OSSE instrument has observed the Galactic center region for ~ 160 days. Its energy resolution at 170 keV ( ~ 24 keV) is comparable to the reported widths of the backscatter peak (12-24 keV), and its 3 sigma sensitivity, ~ 3times 10(-4) photons/cm(2) /s at 170 keV for a 40000 s observation, would easily allow detection of the ~ 1times 10(-3) photon/cm(2) /s fluxes reported by the balloon instruments. We present the results of a day-by-day search of the available data and discuss the statistical compatibility between the OSSE data and the balloon observations.
Johnson Neil W.
Jung Georges
Kinzer Robert L.
Kurfess James D.
Leventhal Marvin
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