Study On The Radiation Mechanism Of The Blazar Jet

It is generally believed that there is a supermassive black hole at the center of the AGNs.Therefore,studying the properties of the AGNs can help us understand black holes.As the most extreme subclass of AGNs,blazars have attracted the attention of many researchers naturally.In this thesis,we mainly discuss the radiation mechanisms of blazars,connection of jet and accretion disk,estimators of the bolometric luminosity.The first chapter of this thesis introduces the characteristics of AGNs and blazars,and briefly describes the broadband spectral energy distribution and radiation models of blazars.The second chapter mainly introduces the physical process related to the jet of blazars,including the acceleration of particles and radiation mechanisms.For the radiation mechanisms,we mainly discuss the synchrotron,inverse Compton scattering and the radiation process of hadron.In the third chapter,a two-zone cylindrical lepton model is applied to the Mrk 421,and it successfully explain the low frequency flat radio spectra,i.e.,a characteristic of most blazars.In chapter four,We collect a sample of blazars with broad line region(BLR)data and the quasi-simultaneous multi-wave band data.By analyzing the correlations between luminosity in radio,optical,X-ray and gamma-ray band,and the correlations of multi-wave band luminosity and BLR luminosity,we provide a new support to the theory of the relationship between the jet and the accretion disk,and find the restrictions of radiation mechanisms in different bands.In chapter five,we get a best estimation method for the bolometric luminosity by analyzing a large samples.For the flat-spectrum radio quasar,it is most appropriate to use gamma-ray luminosity to estimate its bolometric luminosity.