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We calculate the jet power of the classical Blandford-Znajek(BZ) model andhybrid model developed by Meier based on the global solutions of advectiondominated accretion flows (ADAFs) surrounding Kerr black holes. We find thatthe jet power of the hybrid model is larger than that of the pure BZ model. Thejet power will dominate over the accretion power, and the objects will enterinto "jet-power-dominated advective systems", when the accretion rate is lessthan a critical value mdot_c=Mdot_c/Mdot_Edd, where 3*10^-4 < mdot_c < 5*10^-3is a function of black hole spin parameter. The accretion power will bedominant when mdot<mdot_c and the objects will enter into"accretion-power-dominated advective systems." This is roughly consistent withthat constrained from the low/hard-state black hole X-ray binaries (e.g.,Fender et al.). We calculate the maximal jet power as a function of black holemass with the hybrid jet formation model, and find it can roughly reproduce thedividing line of the Ledlow-Owen relation for FR I/FR II dichotomy in the jetpower-black hole(BH) mass plane (Q_jet-M_BH) if the dimensionless accretionrate mdot~0.01 and BH spin parameter j~0.9-0.99 are adopted. This accretionrate mdot~0.01 is consistent with that of the critical accretion rate for theaccretion mode transition of a standard disk to an ADAF constrained from thestate transition of X-ray binaries. Our results imply that most FR I galaxiesmay be in the ADAF accretion mode similar to the low/hard-state XRBs.

Jet power extracted from ADAF and the applications to X-ray binaries and radio galaxy FR dichotomy