Broad-band spectra of Cyg X-1 and correlations between spectral characteristics

Askar Ibragimov, Juri Poutanen, Marat Gilfanov +2

We present the results of spectral analysis of 42 simultaneous broad-band Ginga--OSSE and RXTE--OSSE observations of Cyg X-1 carried out in 1991 and 1996--1999. The hardest spectra…