The coupling of a disk corona and a jet for the radio/X-ray correlation in black hole X-ray binaries

We interpret the radio/X-ray correlation of L _R ~ L _X ^~1.4 for L _X/L _Edd >~ 10^-3 with a detailed disk corona-jet model, in which the accretion flow and the jet are connected by a parameter, η, describing the fraction of the matter in the accretion flow ejected outward to form the jet. We calculate L _R and L _X at different Ṁ, adjusting η to fit the observed radio/X-ray correlation of the black hole X-ray transient H1743-322 for L _X/L _Edd > 10^-3. It is found that the value of η for this radio/X-ray correlation for L _X/L _Edd > 10^-3, is systematically less than that of the case for L _X/L _Edd < 10^-3, which is consistent with the general idea that the jet is often relatively suppressed at the high luminosity phase in black hole X-ray binaries.