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Unification of Radio Galaxies and their Accretion Jet Properties |
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| Authors: | Qingwen Wu Ya-Di Xu Xinwu Cao |
| Institution: | 1. Physics Department, Huazhong University of Science and Technology, Wuhan, China 2. Physics Department, Shanghai Jiao Tong University, Shanghai, China 3. Shanghai Astronomical Observatory, CAS, Shanghai, China |
| Abstract: | We investigate the relation between black hole mass, M bh, and jet power, Q jet, for a sample of BL Lacs and radio quasars. We find that BL Lacs are separated from radio quasars by the FR I/II dividing line in M bh–Q jet plane, which strongly supports the unification scheme of FR I/BL Lac and FR II/radio quasar. The Eddington ratio distribution of BL Lacs and radio quasars exhibits a bimodal nature with a rough division at L bol/L Edd~0.01, which imply that they may have different accretion modes. We calculate the jet power extracted from advection-dominated accretion flow (ADAF), and find that it requires dimensionless angular momentum of black hole j???0.9???0.99 to reproduce the dividing line between FR I/II or BL Lac/radio quasar if dimensionless accretion rate $\dot{m}=0.01$ is adopted, which is required by the above bimodal distribution of Eddington ratios. Our results suggest that black holes in radio galaxies are rapidly spinning. |
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