Observations of black hole candidates with GRANAT

Details Observations of black hole candidates with GRANAT Observations of black hole candidates with GRANAT

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26as...97..281g&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 97, no. 1, p. 281-287.

Astronomy and Astrophysics

Astronomy

68

Black Holes (Astronomy), Spaceborne Astronomy, X Ray Spectra, Astronomical Spectroscopy, Gamma Ray Spectra, Light Curve, Power Spectra, Variability

Scientific paper

During 1990-1992 the spectral and temporal behavior of several black hole candidates was investigated with the ART-P and SIGMA telescopes aboard GRANAT in the broad energy band of 3-1300 keV. Among these candidates there were Cyg X-1, GX339-4, GRS1758-258, GRS1124-68, 1E1740.7-2942 etc. The most of time the sources were in the low (hard) spectral state exhibiting hard Comptonized X-ray spectrum with an energy index of about 0.6 and an exponential cutoff at not less than 100 keV energies. All the three known X-ray states of GX339-4 (low, high and off) were observed. During the low state 0.8 Hz quasi-periodic oscillations of its X-ray flux were discovered. In September 1991 the GRANAT instruments observed the source transition from the hard spectral state to the soft one.

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