Research And Discussion On The Brightness Temperature Of Blazars And Jet Energy

Active galactic nuclei(AGNs)have become a hot and frontier research topic in the field of contemporary astrophysics due to their special observation characteristics.As one of the most active subclasses of AGNs,Blazarss are characterized by high lightness,high polarization,rapid and large light variation,observation phenomena and physical characteristics,which all reflect their structure and physical process.Blazars can be divided into two categories: flat-spectrum radio quasars(FSRQs)have strong emission lines,and the rest frame equivalent width(EW)of their broad emission lines is larger than 5?;the BL Lacs have no or weaker emission line.In this paper,the correlation between the brightness temperature of the blazars and the energy of the black hole jet is studied.This article is divided into four chapters.The first chapter is the introduction of active galactic nuclei,mainly introduces the basic characteristics of active galactic nuclei,classification,model and the estimation method of black hole mass.The second chapter is the radiation characteristics and mechanism of blazars,mainly introduces the radiation characteristics of optical band and high energy band of blazars and five types of radiation mechanism of blazars.The third chapter is the optical variability of Blazars.It mainly introduces three types of optical variability time scales,photometric observations and optical variability models.In chapter 4,we calculate 53 flare source samples,including 22 BL Lac objects and 31 FSRQs.The distribution of the brightness temperature of the sample and the black hole jet energy is studied,and the correlation between the brightness temperature and the black hole jet energy in its subclasses is discussed.The results show that:(1)The brightness temperature of BL Lac and FSRQs is significantly different from the distribution of jet energy of black holes,which may be related to the difference in the intrinsic properties of BL Lac and FSRQs,(2)The correlation between the brightness temperature of the BL Lac object and the jet energy of the black hole is strong.The brightness temperature can describe the jet energy of the black hole of the BL Lac object to a certain extent,and the jets of BL Lac with greater brightness temperature also carry more energy.(3)The correlation between the brightness temperature of the FSRQs and the black hole jet energy is small,and the brightness temperature in FSRQs cannot clearly describe the energy of the black hole jet,and the energy of the black hole jet is less affected by the brightness temperature.The energy of black hole jets in FSRQs may be affected by other factors.