We present the results of a detailed correlation study among the radio, soft and hard X-ray emissions (obtained from NRAO-GBI, RXTE-ASM and CGRO-BATSE observations, respectively) of the persistent X-ray binary Cygnus X-3. In the low-hard state a pivotal behaviour in the X-ray spectra is present in the source, with the X-ray flux below the pivoting point strongly correlating with the radio emission. The harder X-ray flux, above the pivoting point, is anti-correlated to both the softer X-ray (below the pivot point) and radio emissions. The strong correlation between the softer X-ray and the radio emission suggests a close link between the accreting mechanism, the plasma cloud surrounding the compact object and the outflow mechanism (jet). We show that a similar behaviour is present in the well known blackhole candidate Cygnus X-1.
8th Asian-Pacific Regional Meeting, Volume II
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