Spectral states of galactic black hole candidates: results of observations with ART-P/Granat

Details Spectral states of galactic black hole candidates: results of observations with ART-P/Granat Spectral states of galactic black hole candidates: results of observations with ART-P/Granat

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997adspr..19...15g&link_type=abstract

Advances in Space Research, Volume 19, Issue 1, p. 15-23.

Physics

8

Scientific paper

Observations of Galactic black hole candidates performed with the ART-P telescope aboard Granat in 1990-1992 focused our attention on the problem of studying spectral variability of these sources as a function of the accretion rate. We show that in contrast with the current models of disk accretion onto a black hole the hard spectral state of the sources in which they exhibit a Cyg X-1 type hard X-ray spectrum always occurs at smaller accretion rate than the soft state. The arguments that hard X-rays detected during the ``very high'' and ``low'' states of black hole candidates have a distinct origin are presented.

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