Studying On The High-energy Emission Mechanism Of BL Lacs

Blazar is a special class objects of redio-loud Active Galactic Nucleus with extreme observational characteristics,whose relativistic jet direction is roughly aligned to the observer’s sight.For a subclass of blazar,it is difficult to adopt the traditional signal–zone Synchrotron-self-Compton model（SSC）to explain the partly spectral energy distribution（SED）of extreme high-energy peaked BL Lacs（EHBLs）.Therefore,exploring the possible emission mechanism is essential.The paper further study the radiation mechanism base on the systematically summary of observational and emission model.This paper adopts the two components model to explain the multi-wavelength SED of EHBLs.In this model,we consider the synchrotron emission and inverse Compton（IC）scattering of relativistic electrons in the jet,meanwhile,we also consider the interaction of protons with the cosmic microwave background（CMB）photons（pγ process）in intergalactic space which produces the high-energy gamma-ray SED.pγ process produces the Bethe–Heitler pair which scatters the CMB photons to higher energy and then produces the harder SED of gamma-ray.We apply this model to eight EHBLs and obtain the SED of multi-wavelength.Through the analysis of the SED and parameters,we get the following conclusions: 1)Predicting that the Large High Altitude Air Shower Observatory（LHAASO）may collect the high energy data about 1ES 0347-121、1ES 1218+304、1ES 1959+650、1ES 2344+514 and RGB J0710+591 by comparing the SED of eight EHBLs with the LHAASO;2)Discussing the effect of the intergalactic magnetic fields（IGMFs）on the SED and the range 18 145 10 G5 10 G of IGMFs in under the hypothesis that LHAASO can detect them.The pγ process mainly contains three sub-processes: 1)the synchrotron emission and IC scattering of Bethe-Heitler pairs;2)the decay of 0 generates the gamma-rays;3)the decay of is related to the neutrino.The paper adopts the electromagnetic cascade process generated by the interaction of protons with the synchrotron photons in the jet to predict the neutrino emission of TXS 0506+056,which obtains the following conclusions: 1)the model can reproduce the multi-wavelength SED of TXS 0506+056;2)the power-law distribution of protons related to the magnetic field and shock;3)the interaction of the protons with the soft photons in the jet and the freedom parameters is reasonable.The above results indicate the neutrino event Ice Cube-170922 A may originates from the pγ process in the jet of TXE 0506+056.