The Jet Power, Radio Loudness, and Black Hole Mass in Radio‐loud Active Galactic Nuclei

The jet formation is thought to be closely connected with the mass of centralsupermassive black hole in Active Galactic Nuclei. The radio luminositycommonly used in investigating this issue is merely an indirect measure of theenergy transported through the jets from the central engine, and severelyDoppler boosted in core-dominated radio quasars. In this work, we investigatethe relationship between the jet power and black hole mass, by estimating thejet power using extrapolated extended 151 MHz flux density from the VLA 5 GHzextended radio emission, for a sample of 146 radio loud quasars complied fromliterature. After removing the effect of relativistic beaming in the radio andoptical emission, we find a significant intrinsic correlation between the jetpower and black hole mass. It strongly implies that the jet power, so as jetformation, is closely connected with the black hole mass.To eliminate thebeaming effect in the conventional radio loudness, we define a new radioloudness as the ratio of the radio extended luminosity to the opticalluminosity estimated from the broad line luminosity.In a tentatively combinedsample of radio quiet with our radio loud quasars, the apparent gap around theconventional radio loudness R=10 is not prominent for the new-defined radioloudness. In this combined sample, we find a significant correlation betweenthe black hole mass and new-defined radio loudness.Comment: 35 pages, 10 figures. accepted by Ap