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Properties Of The Hard X-ray Emission From The Black Hole Candidates: Cygnus X-1 And 1E1740.7-2942 | | S.Kuznetsov
; M.Gilfanov
; E.Churazov
; R.Sunyaev
; I.Korel
; N.Khavenson
; A.Dyachkov
; B.Novikov
; J.Ballet
; P.Laurent
; M.Vargas
; A.Goldwurm
; J.P.Roques
; E.Jourdain
; L.Bouchet
; V.Borrel
; | | Date: |
28 Apr 1997 | | Journal: | ESA SP-382, p. 213-216 | | Subject: | astro-ph | | Abstract: | The entire dataset of the GRANAT/SIGMA observations of Cyg X-1 and 1E1740.7-2942 in 1990-1994 was analyzed in order to search for correlations between primary observational characteristics of the hard X-ray (40-200 keV) emission - hard X-ray luminosity, hardness of the spectrum (quantified in terms of the best-fit thermal bremsstrahlung temperature kT) and the RMS of short-term flux variations. Although no strict point-to-point correlations were detected certain general tendencies are evident. It was found that for Cyg X-1 the spectral hardness is in general positively correlated with relative amplitude of short-term variability. The correlation of similar kind was found for X-ray transient GRO J0422+32 (X-ray Nova Persei 1992) and recently for GX339-4. For both sources approximate correlation between kT and L_X was found. At low hard X-ray luminosity - below 10E37 erg/sec - the kT increases with increase of L_X. At higher luminosity the spectral hardness depends weaker or does not depend at all on the hard X-ray luminosity. The low luminosity end of these approximate correlations (low kT and low RMS) corresponds to extended episodes of very low hard X-ray flux occurred for both sources during SIGMA observations. | | Source: | arXiv, astro-ph/9704266 | | Services: | Forum | Review | PDF | Favorites | |
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