Spectral states of 1E1740.7-2942

Details Spectral states of 1E1740.7-2942 Spectral states of 1E1740.7-2942

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26as...97..173c&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 97, no. 1, p. 173-176.

Astronomy and Astrophysics

Astronomy

17

Astronomical Spectroscopy, Galactic Nuclei, Milky Way Galaxy, X Ray Sources, X Ray Spectra, Black Holes (Astronomy), Light Curve, Positron Annihilation, Spectral Bands, Spectrum Analysis

Scientific paper

1E1740.7-2942, the hardest bright source close to the dynamic center of our Galaxy has been systematically studied by GRANAT in 1990-1992. The 40-150 keV flux varies from the 130 mCrab level to less than 10 mCrab on time scales of months to years. In addition to a state in which the luminosity and the spectral shape resembles that of Cyg X-1, a 'low' state and two different hard states with excess at high energies were observed. These hard states are likely to be connected with the e(+)e(-) annihilation process.

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