Study On Quality, Polarization And Jet Characteristics Of Black Hole In Active Galaxy

In this paper, we study a series of main problems including the relation between polarization and beaming effects for blazars detected by Fermi Large Area Telescope(LAT), the relation between black hole mass, jet power and accretion of active galactic nuclei(AGNs), the model of flat-spectrum radio quasars(FSRQs) unify with FRII and BL Lacs unify with FRI.Fisrtly, we briefly introduce the basic features of AGNs, for example, the classification and unification of AGNs; the estimated method of black hole mass for AGNs; the polarization, jet and accretion for AGNs; and the space Telescope of Fermi gamma-ray. Subsequently, according to the blazars detected by the Fermi LAT, we study the characteristics of polarization and beaming effects for Fermi and non-Fermi blazars. The results are as following:(1) the blazars detected by Fermi LAT have higher average R and polarizations than those not detected by Fermi LAT.(2) Compared with BL Lacs, flat-spectrum radio quasars(FSRQs) have lower average R and the ratio of beamed luminosity to the unbeamed luminosity f.(3) In the diagram of polarization and Doppler factor relations, Fermi FSRQs may have p=α+3 and BL Lacs for p=α+2. These above results suggest that the polarization is correlated to the beaming effect. The difference in polarization and core-dominance parameters between FSRQs and BL Lacs are due to the difference in their beaming effects and jet model. Moreover, we study the relation between jet power and black hole mass and accretion ratiofor Fermi blazars and radio galaxy. The results are as following:(1) the jet power of flat-spectrum radio quasars(FSRQs) and the FRII high-excitation galaxy(HEG) depends on the black hole mass, which suggests that the FSRQs and FRII HEG are in the radiation-pressure dominated regime. The jet power of BL Lacs and the FRI low-excitation galaxy(LEG) depends on the accretion ratio, which suggests that the BL Lacs and FRI LEG are in the gas-pressure dominated regime.(2) We find that most of FSRQs and BL Lacs have, which suggests that the Blandford-Znajek mechanism is insufficient to explain the jet power of these objects.(3) The FSRQs are roughly separated from BL Lacs by Ledlow-Owen’s dividing line in the log Pjet-log M plane, which supports that the FSRQs unify with FRII and BL Lacs unify with FRI.(4) The FSRQs and BL Lacs have a clear division at Lbol/LEdd~0.01, and the distribution of Eddington ratios of BL Lacs and FSRQs exhibits a bimodal nature, which suggest that the accretion mode of FSRQs may be different from that of BL Lacs.Lastly, we study the relationship between jet power and accretion for Fermi and non-Fermi blazars. The results are as following:(1) the distributions of redshift, black hole mass and broad line luminosity have significant differences for Fermi and non-Fermi blazars.(2) Compared with non-Fermi blazars, Fermi blazars have a higher average core-dominance parameter, which suggests that Fermi blazars have a strong beaming effect.(3) We get that broad line luminosity and jet power have a significant correlation for Fermi and non-Fermi blazars, which suggests a direct tight connection between jet and accretion.(4) The accretion and black hole mass may have a different contribution to jet power for Fermi and non-Fermi blazars.