Study On 3C 454.3 Optical Variability And Spectral Energy Of Blazar

Blazars is one of the most popular research fields in AGNs because of its extremely fast light variation,high redshift and multi band high energy radiation.The discussion of the blazar black hole model is also the main direction of modern astrophysics.Because of its unique observational properties,the bright variety has formed a special kind of object among many subclasses of AGN.Light variation is one of the few but very violent observation phenomena that can be observed by the blazars.It is widely considered that it is due to the directional effect of the jet pointing to the earth observer.Therefore,by studying the light variation of the blazars,we can obtain the information of the blazars,and then we can study its internal structure,radiation mechanism and analyze the special observation phenomena of the blazars.The multi band energy spectrum of the blazars also shows a unique bimodal structure.The study shows that the bimodal position of the blazars is obviously related to the synchronous peak position.It is very helpful to study the light variation and energy spectrum characteristics of the blazars to reveal the relationship between the radiation origin of the blazars and the central supermassive black hole.In Chapter 1,the basic definition,classification and physical model of AGNs are introduced;In Chapter 2,based on the observation characteristics,the energy spectrum characteristics and the theoretical model of multi band radiation,the basic information of the blazars is introduced and described in detail to strengthen the understanding of the blazars.In Chapter 3,we introduce the physical model of blazar,and introduce that there are three types of light variation of blazar: short time scale(within a day or even a few seconds),medium time scale and long time scale;In Chapter 4,the infrared and optical historical data in SMARTS database are introduced to study the period of 3C 454.3;In Chapter 5,we collect the third and fourth stages of Fermi satellite data to analyze the spectral characteristics of a certain number of blazars,and analyze the relationship between its red shift and spectral index.