Statistic Study For Superluminal Sources In Active Galactic Nucleis

Superluminal motion is the most prominent phenomenon in radio band of Active Galactic Nucleis(AGNs).Most AGNs with several components which appear to move apart in successive high-resolution(VLBI) images.When the apparent transverse velocity of separation exceeds the velocity of light(β_app=v/c>1),the motion,and the object,are called superluminal.In this paper,we collected a sample of objects with supeduminal motion and computed the apparent velocity(β_app) for 224 component in 123 sources(84 quasars,27 BL Lac objects and 12 galaxies) inΛ-CDM model, using the method of correlation analysis and so on,we analyzed the effect ofβ_app in different parameters,discussed the distribution of superluminal suorces in three type objects.Chapter 1 introduced the research history of superluminal motion and the significance of our research simply.Chapter 2 summarized the observation characteristics of superluminal sources and theoretical explanation.Along with the development of technology and more amelioration of the observed instrument,the monitor and search for supeduminal motion and supeduminal sources become more extensive in international,also abundant observed data have been got together.The general characteristics of the superluminal sources revealed so far are summarized in the first section of this chapter.Then the position of the superluminal in the classification frame of the AGN is discussed briefly.The theoretical models and investigations of superluminal sources,which are widely accepted by radio astronomers,are reviewed in the third part of the chapter.Chapter 3 we discussed some of correlation character and found that for the three subclasses,the proper motion increase from quasar to galaxy with BL Lac being in between them.Also due to the beaming effect,the relation between observed flux density and redshift have no correlation,so we make magnified.When we consideredδ～β_app,the correlation between the intrinsic(corrected) flux density and the redshift is much better than that for the observed flux density,and that the relativistic beaming boosting effect is,to some extend,the same thing with the superluminal motion.Chapter 4 reported the optical monitoring of BL Lac object OJ 287,which is spuerluminal source,also the typical object to explain the long-term periodical variation of AGN.This chapter we expatiated the result of the optical monitoring for OJ 287,which has been monitored at the She Shan station of the Shanghai Astronomical Observatory(ShAO) from 2001 to 2007,also we explored the possible period about it.