Research On Jet Radiation And Jet Generation Efficiency Of Blazars

The radiation of blazars is dominated by relativistic bunched jets with a small angle between the jets and the observer's line of sight.The relativistic jets dominated by their nucleus have fast,large optical variation and apparent superluminal motion.The variation in flare can increase by several orders of magnitude in a short period,ranging from days to months,and can be observed at all wavelengths,accompanied by dramatic polarization changes.Accretion is an important physical process of black hole systems.Many high-energy physical processes of active galactic nuclei are inseparable from the accretion of black holes.When the angle between the jets and the line of sight cannot distinguish between FSRQs and BL Lacs,the difference in the accreation model may be the reason for the classification of blazars into FSRQs and BL Lacs,so studying the accretion and other parameters of blazars is of great significance to reveal the difference between FSRQs and BL Lacs.In chapter 1,we introduce the characteristics of active galactic nuclei,the current classification and theoretical models of active galactic nuclei,and the characteristics and classification of blazars.In chapter 2,we introduce the model of particle radiation in blazar jets in detail,which can produce radio bands in synchrotron radiation and lepton models,and the high-energy band in inverse Comm Scope scattering and hadron models.In chapter 3,the discrete correlation function method was used to estimate the correlation between every two bands.The correlation between multi-bands was evaluated by discrete correlation function method.The results show that the correlation coefficient between gamma band and radio band is 0.53,and the time delay is about 90 days,a variation of the gamma band is about 90 days ahead of radio band;the correlation coefficient between radio band and optical V-band is 0.84,and the time delay is about-300 days,a variation of the optical V-band is about 300days ahead of radio band;There is no significant correlation between gamma and optical V-band.By these results,the optical band is dominated by synchrotron radiation,and the time delay between the radio band and the optical band can be explained as the radiation region of the optical band is upstream and the radio band is downstream.The gamma band and the radio band are homologous.The distribution of brightness temperature was used to calculate the Doppler factor of the celestial body's radio band.The averaged Doppler factor is 12.64,and it oscillates with the light curve.So the jet has obvious beaming effect,and the variation of radiation flux in radio band comes from the jet.In chapter 4,data of 168 blazars were collected.These blazars include 125 FSRQs and 43 BL Lacs.The characteristics of active galactic nuclei with jets can be measured by some basic parameters,such as jet power,accretion disk luminosity,black hole spin,accretion disk magnetic field,black hole(BH)mass,etc.The results show that these source jet power(logP_jet)is in the range of 44.33-47.83,the accretion disk luminosity(logL_disk)is in the range of 43-47.43,the black hole spin(j)is in the range of 0.033-0.912,and the magnetic field strength(log B)is in the range of 4.09-5.98,the black hole mass(log M M)is between6.51-9.8.We analyzed the relationship between these parameters and found that there are general correlations among these parameters,such as a significant positive correlation between jet power and accretion rate,and a significant negative correlation between black hole mass and magnetic field.There is also a significant positive correlation between the black hole spin and the radio luminosity,and there is a certain relationship between the black hole spin and the jet power,and it is found that the accretion rate and the magnetic field of the accretion disk of BL Lacs have a positive feedback effect,but FSRQs have the opposite effect.We found that the intrinsic?luminosity of BL Lacs is positively correlated with the magnetic field of the accretion disk,and the intrinsic?luminosity of FSRQs is negatively correlated with the magnetic field of the accretion disk.Our interpretation is that the occurrence of FSRQs is earlier than that of BL Lacs.Due to the significant relationship between intrinsic?-rays and black hole spins,we believe that the BZ model is more realistic than the BP model.Due to the significant correlation between the accretion rate and the magnetic field of the accretion disk,when the magnetic field of the accretion disk is considered in the multiple linear regression,there is no significant difference between the FSRQs and the BL Lacs.The contribution rate of the accretion rate to the generation of the jet is about 50%,and the contribution rate of the black hole mass is about 20%.