The Radio : X-ray Correlation of Cygnus X-3 and other Galactic Microquasars

Cygnus X-3, among the Galactic X-ray binaries, is one of the brightest radio sources. Radio image as well as spectral analysis shows the presence of outflow in the form of jets. The SED in the X-ray band shows a complicated structure and evolution. Here we review some recent results of the correlation of the long-term radio and X-ray emission, in the various states of the source, with emphasis on the low (hard) state. We compare the results with those of other common Galactic microquasars, and attempt to provide a consistent picture of the accretion-ejection mechanism in these types of binaries.