Observations of diffuse galactic positron annihilation radiation

Details Observations of diffuse galactic positron annihilation radiation Observations of diffuse galactic positron annihilation radiation

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993adspr..13..709b&link_type=abstract

Advances in Space Research (ISSN 0273-1177), vol. 13, no. 12, p. (12)709-(12)713

Astronomy and Astrophysics

Astronomy

Astronomical Maps, Astronomical Models, Gamma Ray Astronomy, Gamma Ray Spectra, Milky Way Galaxy, Positron Annihilation, Cesium Iodides, Curve Fitting, Data Reduction, Goodness Of Fit, Heao 1, Radiation Counters, Sodium Iodides

Scientific paper

The Galactic plane was scanned nearly three times by the University of California, San Diego/Massachusetts Inst. of Tech. (UCSD/MIT) Hard X-ray and Low Energy Gamma-Ray Experiment on HEAO-1 from August 1977 through September 1978. Its Medium Energy Detectors were of the NaI/CsI phoswich type and operated over the 100 keV to 2 MeV range, with a 17 deg Full Width at Half Maximum (FWHM) field of view and a 9% energy resolution at 511 keV. Sky maps for each epoch of observation were constructed in several energy bands. After subtraction of known point sources, a component associated with the galactic plane remains, whose spectrum is consistent with a power law and a positron annihilation spectrum. In the 333 to 583 keV energy band the flux is concentrated within +/- 35 deg of the galactic center, and the ratio of lux/radian (anticenter) is high, with a 2 sigma lower limit of 13. The parameters of the galactic center region's annihilation spectrum are positronium fraction of 0.9 +/- 0.1 and 511 keV flux of (2.0 +/- 0.7) x 10-3 photons/((sq cm(s)(rad)).

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