Study On The High-energy Gamma-ray Radiation Characteristics Of Blazar Jets

Blazars are Radio-Loud Active Galactic Nucleus(AGNs)with extreme radiative properties in extragalactic gamma-ray sources.BL Lacs,subclass of the blazars,because of their simplicity,these objects are particularly attractive because they do not show any radiation from the accretion disk of a black hole,and have no or only weak emission lines,are ideal objects for studying jet physics.In this paper,the turbulent acceleration of plasma in BL Lac jet and the resulting particle distribution are studied,and a Synchro-Self-Compton model based on anisotropic particle distribution is established.Our model assumes that the turbulent plasma cascade is the main dissipation mechanism of the jet magnetic energy,and the particles accelerate along the background magnetic field at the initial moment.In the highly magnetized plasma region,the particle-wave resonance interaction leads to the uniform momentum distribution of the low-energy particles,but the mechanism is invalid for the high-energy particles,so the high-energy particles accelerate with a small helical angle.The smaller spiral angle causes the synchrotron radiation to weaken.In order to produce a certain intensity of radiation,it is necessary to increase the magnetic field,so as to satisfy the energy equipartition relationship.The model is applied to three typical BL Lac objects,and the results show that the energy density of electron and magnetic field in the jet dissipation region can satisfy the energy equalization relationship assumed by the Synchrotron-Self-Compton(SSC)model.In addition,based on the Fourth Fermi Catalog we study the Log-Parabolic(LP)and Power-Law(PL)blazar’s some parameters.We selected 1462 high-confidence blazars with redshift values from The Fourth Catalog of Active Galactic Nuclei Detected by the Fermi Large Area Telescope(4LAC),including 1130 Power-Law(PL)and 332 Log-Parabolic(LP)blazars.The four parameters of redshift,gamma-ray energy flux,luminosity and light variation index of two different spectral types of blazars are analyzed statistically.The results show that the distribution of energy flux,light variation index and luminosity all show obvious bimodal structure.We believe that the different gamma-ray spectra of the two blazars are intrinsic,and that the reason for the two different spectra is not the low number of photons detected,but the actual physical processes and radiation mechanisms of the blazar.