Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...433l..21m&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 433, no. 1, p. L21-L23
Astronomy and Astrophysics
Astronomy
18
Black Holes (Astronomy), Gamma Ray Astronomy, Spaceborne Astronomy, Stellar Mass Accretion, Stellar Spectra, X Ray Astronomy, Astronomical Spectroscopy, Gamma Ray Telescopes, Proportional Counters, Rosat Mission, Spectrum Analysis, Stellar Models, X Ray Spectra
Scientific paper
We report the results of the first simultaneous observation of GRS 1758-258 at soft and hard X-ray energies. The data have been obtained with the ROSAT Position Sensitive Proportional Counter (PSPC) (0.1-2.4 keV) and with SIGMA/Granat coded mask telescope at energies greater than 40 keV. The ROSAT observation shows the presence of a soft spectral component above the low-energy extrapolation of the flat power law measured at high energies with SIGMA. This soft spectral component was weaker in 1990, when the hard X-ray flux from GRS 1758-58 was in its highest observed state. These characteristics, similar to those observed in black hole candidates such as Cyg X-1 and the ultrasoft X-ray transients, support the interpretation of GRS 1758-258 as an accreting black hole in a binary system.
Belloni Tomaso
Goldwurm Andréa
Mereghetti Sandro
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