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The radio/X-ray correlation is one of the most important pieces ofobservational evidence of the disk-jet connection in accreting compact objects.However, a growing number of X-ray binaries seem to present deviations from theuniversal radio/X-ray correlation and the origin of these outliers are stillvery much debated. In previous studies, the X-ray bolometric luminosity used inthe radio/X-ray correlation has been estimated using a narrow, soft X-ray band.We study how estimating the X-ray bolometric luminosity using broadbandobservations of X-ray binaries affects the radio/X-ray correlation. We foundthat the ratio between the broadband (3-200 keV) and narrowband (3-9 keV)luminosities varies between 5-10 in the hard X-ray state. Overall, theresulting radio/X-ray correlation slopes and normalizations did not present avery significant change suggesting that they are not affected greatly byobservational biases but are caused by real physical effects. We found that allsources that reach high enough luminosity change their correlation slopes fromthe universal slope to a much steeper one. In addition, sources in the steeperradio/X-ray track show a distinct cutoff in the high energy X-ray spectrum attens of keV. These results suggest that the accretion flow presents amorphological change at a certain critical luminosity during the outburst risefrom radiatively inefficient to radiatively efficient flow that is in turn moreefficient in cooling the hot accretion flow producing the hard X-ray emission.This change could also affect to the jet launching properties in these systems.

The radio/X-ray correlation in X-ray binaries - Insights from a hard X-ray perspective