Integral observation of Cyg X-1 in an intermediate state
J. Malzac, P. O. Petrucci, E. Jourdain, P. Sizun, M. Cadolle, G. Pooley, C. Cabanac, S. Chaty, T. Belloni, J. Rodriguez, J. P. Roques, P. Durouchoux, A. Goldwurm, P. Laurent
Abstract
We present preliminary results of an observation of Cygnus X-1 with INTEGRAL performed on June 7-11 2003. Both spectral and variability properties of the source indicate that Cygnus X-1 was in an intermediate state. As expected during state transitions, we find an anticorrelation between the 3-10 keV and the 15 GHz radio fluxes and a strong correlation between the 3-200 keV hardness and radio flux.
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