Relativistic Beaming Effect For Blazar

Numerous astronomers are attracted to conduct the researches on Active GalacticNuclei (AGNs), for the reason of violent activities and extremely physical conditions.Blazar is one subclass of AGNs, with high luminosity, rapid and large amplitude variabil-ity, high and variable polarization, compact radio radiation and apparent superluminalmotion. The jet as a structure of AGNs is a huge energy carrier moving with relativisticvelocity and collimation to large distance. Astronomers are very interested in this physicalproperties with extreme conditions.Astronomers did a lot of works from the beaming indicators about relativistic beam-ing efect for Blazar. For example, Ghisellini discuss the evidence for relativistic bulkmotion of the emitting plasma in1993. He discovered the Doppler factor and otherbeaming indicators, such as the value of the expansion velocity and the ratio of the coreto the extended radio flux, support the simple kinematic model of ballistic motion of knotsin a jet. Furthermore, he also discovered the mean values of the bulk Lorentz factor andviewing angle derived for the superluminal sources are consistent with those found fromthe attempts to unify BL Lacertae objects and radio-loud quasars with Fanarof-RileyTypes I and II radio galaxies, respectively. Wills et al discussed the relationship of core-dominance parameter, polarization and redshift in1992. And he got a conclusion thathigh optical polarization quasars and flat-spectrum core-dominant quasars are essentiallythe same objects. Fan also discussed the relationship of core-dominance parameter andpolarization in2002and2003. In2009, Fan obtained a result: The radio luminosity isfound to be correlated with the radio Doppler factor. These reflect the relativistic beam-ing efect for Blazar. This paper not only describes he relativistic beaming efect but alsodiscusses the relationship among the spectral index, polarization and the core-dominanceparameter.The dissertation involves five chapters, whose details can be expanded as follows:ⅰ) In the chapter1of this paper, we outline mainly the basic properties, the taxonomyand the unified model of active galactic nuclei;ⅱ) In the chapter2we introduce basically relevant properties, relativistic beaming modeland relativistic beaming efect in jet;ⅲ) In the chapter3, we discuss the spectral index and polarization with the core-dominance parameter, respectively. We can illustrate the observation data whichwe obtained with the relativistic beaming efect. We find the spectral index(αt) associated with the core-dominance parameter(R). And using the two-componentbeaming model can explain this correlation reasonably. In addition we also find thepolarization (P)associated with the core-dominance parameter (R). The greater R,the greater P. But the polarization will almost unchanged until a certain time;ⅳ) In the chapter4, we make a comparison for two subclasses of Blazar (BL Lac andFSRQ) from the emission line properties, polarization, the luminosity, the core-dominance parameter and the central black hole quality, There are strong emissionlines in FSRQ, but there are no emission lines in BL Lac,or the emission lines in BLLac are weak. FSRQ are more luminous and lowly polarized than BL Lac. FSRQhave a smaller value of the core-dominance parameter than BL Lac. The centralblack hole masses have no much diference between FSRQ and BL Lac. So in otherwords,it seems that there is a continuous property as XBLs, RBLs and FSRQ in theSED discussions. The diference between XBLs and FSRQ is very clear, while RBLsare the bridge between XBLs and FSRQ;ⅴ) The chapter5is the summary and expectation.