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Abstract: The synchrotron self-Compton SSC models and External Compton EC models ofAGN jets with continually longitudinal and transverse bulk velocity structuresare constructed. The observed spectra show complex and interesting patterns indifferent velocity structures and viewing angles. These models are used tocalculate the synchrotron and inverse Compton spectra of two typical BL Lacobjects BLO Mrk 421 and 0716+714 and one Flat Spectrum Radio QuasarsFSRQs 3c 279, and to discuss the implications of jet bulk velocitystructures in unification of the BLO and FR I radio galaxies FRI. Bycalculating the synchrotron spectra and SSC spectra of BL Lac object jets withcontinually bulk velocity structures, we find that the spectra are muchdifferent from ones in jets with uniform velocity structure under the increaseof viewing angles. The unification of BLO and FRI is less constrained byviewing angles and would be imprinted by velocity structures intrinsic to thejet themselves. By considering the jets with bulk velocity structuresconstrained by apparent speed, we discuss the velocity structures imprinted onthe observed spectra for different viewing angles. We find that the spectra aregreatly impacted by longitudinal velocity structures, becasue the volumeelements are compressed or expanded. Finally, we present the EC spectra ofFSRQs and FR II radio galaxies FRII and find that they are weakly affected byvelocity structures compared to synchrotron and SSC spectra.



Author: Jianping Yang, Jiancheng Wang, Benzhong Dai, Xiaoyan Gao

Source: https://arxiv.org/







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