Sigma discovery of variable e(+)-e(-) annihilation radiation from the near Galactic center variable compact source 1E 1740.7 - 2942

Details Sigma discovery of variable e(+)-e(-) annihilation radiation from the near Galactic center variable compact source 1E 1740.7 - 2942 Sigma discovery of variable e(+)-e(-) annihilation radiation from the near Galactic center variable compact source 1E 1740.7 - 2942

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...383l..45b&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 383, Dec. 20, 1991, p. L45-L48.

Astronomy and Astrophysics

Astronomy

166

Black Holes (Astronomy), Galactic Nuclei, Galactic Radiation, Gamma Rays, Milky Way Galaxy, Positron Annihilation, Emission Spectra, Gamma Ray Astronomy, Spaceborne Astronomy, Spaceborne Telescopes, X Ray Astronomy

Scientific paper

A series of observations of the Galactic center have been performed by the hard X-ray and low-energy gamma-ray coded imaging telescope SIGMA, aboard the GRANAT space observatory, in March, April, September, and October 1990, in the energy range 35 keV-1.3 MeV. The emission of the close nucleus center region above 35 keV was found to be dominated up to 300 keV by the previously observed X-ray source 1E 1740.7 - 2942, situated about 48 arcmin away from the radio source Sgr A. During the October 13, 1990, observation, it was discovered that the source was exhibiting a remarkable feature in its emission spectrum (E is greater than 300 keV), which appears as a bump, reaching a maximum intensity around 500 keV, followed by an approximately 700-keV cutoff. In an observation performed the day after, this feature was absent, showing that the source had recovered its nominal state in a very short time.

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