Sigma observations of the galactic center at 511 keV

Details Sigma observations of the galactic center at 511 keV Sigma observations of the galactic center at 511 keV

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...444..222m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 444, no. 1, p. 222-225

Astronomy and Astrophysics

Astronomy

12

Galactic Nuclei, Gamma Ray Astronomy, Milky Way Galaxy, X Ray Astronomy, Emission Spectra, Energy Spectra, Galactic Radiation, Radiation Sources

Scientific paper

The SIGMA experiment on board the Granat satellite has carried out numerous observations of the Galactic center region during the past four years, totalling more than 1200 hr of data. After a careful study of an correction for the systematic errors, we derive a 2 sigma upper limit of 2.3 x 10-4 gamma/sq cm s for the narrow 511 keV emission from 1E 1740.7-2942, suggested as the most likely candidate for the variable 511 keV line emission. No compact narrow 511 keV radiation source has been detected within a radius of approximately 2 deg around this object.

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