Studying On The Multi-wavelength Radiation Mechanism And Physical Characteristics Of TeV Fermi Blazars

As distant and bright sources,the multi-wavelength energy spectral distribution(SEDs)of Fermi TeV blazars can be used to study the astrophysical problems such as the jet of blazars,extragalactic background light(EBL)and intergalactic magnetic field(IGMF),etc.The observations of Fermi-LAT and Atmospheric Cherenkov Telescope provide experimental support for the mechanism of high-energy radiation in the blazars jets.In this paper,the basic characteristics of active galactic nuclei(AGN)and blazars and the spectral energy distribution(SED)of blazars are introduced.According to the uniform Synchrotron-Self-Compton(SSC)model approximated by? function,the multi-wavelength radiation SED is analyzed by using a fitting algorithm based on log-parabolic(LP)modeling,and the relevant results are obtained.Then,the physical parameters and electron distribution in the jet radiation region are reverse deduced.The average state multi-wavelength data of the Fermi TeV blazars were collected,the model parameters were calculated,and the radiation mechanism and physical properties were studied.The specific research works is as follows:in this thesis,the average state multi-band data of 69 Fermi TeV blazars samples were collected,and the distribution of energy spectrum was fitted with a log-parabolic model to obtain the relevant physical parameters.The paper conducts statistical analysis on three physical parameters,namely,spectral index,peak frequency of energy spectrum and energy spectrum curvature,and the results are as follows:(1)the spectral index distributions of HBLs,IBLs,LBLs and FSRQs are different,and the spectral index sizes of different bands show the distribution law of HBLs<IBLs<LBLs,except the radio bands for Fermi TeV BL Lac objects.(2)there was a positive linear correlation between the peak frequency of the synchrotron radiation energy spectrum of BL Lac objects and the peak frequency of the inverse Compton scattering energy spectrum.(3)through cluster analysis of the curvature of bump distribution range of the given four types of samples of HBLs,IBLs,LBLs and FSRQs.(4)the peak frequency of the synchrotron radiation energy spectrum and the inverse Compton scattering energy spectrum have a strong negative correlation with the spectrum index of the infrared,optical,ultraviolet and soft X-ray bands,while the curvature of the synchrotron radiation energy spectrum has a positive correlation with the spectrum index of all bands except the radio band.(5)there is a strong negative correlation between the peak frequency of the synchrotron radiation energy spectrum and the curvature of the synchrotron bump.In addition,the average state multi-wavelength observations of 64 Fermi TeV blazars with redshift are collected.Based on the analysis results of the LP model,the physical parameters of the jet radiation region are reverse deduced,and the correlation between the intrinsic radiation parameters is analyzed.The Doppler factor(D),magnetic field strength(B),radiative region radius(R)of the jet and the peak Lorentz factor(?p)of the non-thermal electron of the TeV HBLs are estimated.The following conclusions are obtained:(1)The inverse Compton scattering(ICs)of TeV HBLs occurs in the Klein Nishina(KN)scattering region;(2)The Compton dominant parameter<AC>of TeV HBLs is very small,and the peak frequencies of intrinsic synchrotron and intrinsic ICs has positive linear correlation,indicating that the radiation energy of TeV HBLs is in well agreement with SSC model.AC?10 for FSRQs,indicating that it is more consistent with External Compton(EC)model;(3)There is a strong linear positive correlation between the reciprocal of the curvature at the peak and the intrinsic peak frequency of the synchrotron bump,and a weak negative correlation between the reciprocal of the curvature at the peak and the intrinsic peak frequency of ICs bump.(4)There is a strong linear positive correlation between intrinsic ICs peak luminosity and intrinsic ?-ray luminosity and between intrinsic ICs peak frequency and peak Lorentz factor.(5)There is a strong negative linear correlation between log B and log ?p.(6)There is no correlation between log R and log ?p.