The Influence of Gamma-Ray Point Sources on OSSE Positron Annihilation Studies

Details The Influence of Gamma-Ray Point Sources on OSSE Positron Annihilation Studies The Influence of Gamma-Ray Point Sources on OSSE Positron Annihilation Studies

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..aprb17071m&link_type=abstract

American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As

Astronomy and Astrophysics

Astrophysics

Scientific paper

Nine years of observations with the CGRO/OSSE instrument have allowed the first maps of positron annihilation radiation. The extraction of annihilation radiation from a complex spectrum composed of both compact and diffuse sources depends upon the unique spectral signatures of 511 keV line and positronium continuum emissions. Nonetheless, a detailed study of individual observations has revealed that the flaring of hard gamma-ray sources might generate erroneous estimates of annihilation radiation. We present preliminary results from simulated spectral fits combined with a detailed analysis of actual OSSE spectra, which study whether ``anomalous" features in positron annihilation maps (such as the annihilation fountain) appear to be real or artifacts of gamma-ray point sources.

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