Dissertation > Astronomy,Earth Sciences > Astronomy > Stellar astronomy,galactic astronomy,cosmology > Quasars, star-like radio sources

Study on the Jet Trajectory of the BL Lac Object 0735+178

Author ZhangJingWei
Tutor GongBiPing
School Huazhong University of Science and Technology
Course Theoretical Physics
Keywords Active Galactic Nuclei (AGN) BL Lac Astronomical Cascade Precession Apparent superluminal motion
CLC P158
Type Master's thesis
Year 2009
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BL Lac objects 0735178 jet in mid - 1992 presents a linear trajectory , however, was observed in the mid - 1995 to mid - 1998 jet has two obvious ninety bending away from the nuclear 2mas distance structure , and on the jet apparent superluminal motion . In this paper, a non - ballistic model better fit this interesting phenomenon , and by the model jet trajectory from 2000 to 2002 , will re- transformed into linear , of this 15.335GHZ and 15.365GHZ band the observational data are in good agreement . This work is mainly focused on the following aspects : First of all, the second chapter discusses the formation of active galactic nuclei jet as well as the radiation mechanism . Form a part of the jet stream , the main jet collimation and acceleration mechanism ; part of the jet radiation mechanism is introduced jet two important mechanisms of radiation - synchrotron radiation and inverse Compton scattering . Second, third chapter discusses the precession of jets in active galactic nuclei and apparent superluminal motion . This chapter first jet disk precession mechanism and the Lense-Thirring precession mechanism be briefly introduced ; apparent superluminal motion of active galactic nuclei jet stream hot research topic in This article detailed discussion of both ballistic and non - ballistic model and the two models do a comparison. Finally, the focus of this article , we use non - ballistic model fitted well with the changes in the BL Lac objects 0735178 jet trajectory and predict the trajectory of the jet in the future on the basis of non - ballistic model change , these need to be further observations to test .

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