Two-year monitoring of persistent point sources in the Galactic center region at soft gamma-ray energies with SIGMA

Details Two-year monitoring of persistent point sources in the Galactic center region at soft gamma-ray energies with SIGMA Two-year monitoring of persistent point sources in the Galactic center region at soft gamma-ray energies with SIGMA

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26as...97..177c&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 97, no. 1, p. 177-180.

Astronomy and Astrophysics

Astronomy

11

Galactic Nuclei, Gamma Ray Astronomy, Gamma Ray Telescopes, Milky Way Galaxy, Point Sources, Black Holes (Astronomy), Emission Spectra, Spaceborne Astronomy

Scientific paper

After more than two years of successful in-orbit operations, the coded-aperture SIGMA telescope has accumulated 710 hours of live-time observations of the Galactic Center region. In addition to few transients, three persistent yet strongly variable point-sources have been detected in the soft gamma-ray regime. The long-term behavior of the soft gamma-ray emission of the three persistent sources is presented, as well as the long-term spectral properties of the two harder ones.

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