Journal of astrophysics and astronomy | |
Kinematical Diagrams for Conical Relativistic Jets | |
Pronoy Sircar23  Samir Dhurde32  Gopal-Krishna11  | |
[1] National Centre for Radio Astrophysics, Tata Institute of Fundamental Research, Pune University Campus, Post Bag No. 3, Pune 411 007, India.$$;Inter-University Centre for Astronomy & Astrophysics, Pune University Campus, Post Bag No. 4, Pune 411 007, India.$$;Department of Physics, Indian Institute of Technology, Kanpur, India.$$ | |
关键词: Blazars: general; galaxies: active; quasars; jets; nuclei; radio continuum.; | |
DOI : | |
学科分类:天文学(综合) | |
来源: Indian Academy of Sciences | |
【 摘 要 】
We present diagrams depicting the expected inter-dependences of two key kinematical parameters of radio knots in the parsec-scale jets of blazars, deduced from VLBI observations. The two parameters are the apparent speed (ð‘£app = cð›½app) and the effective Doppler boosting factor (ð›¿eff) of the relativistically moving radio knot. A novel aspect of these analytical computations of ð›½â€“𛿠diagrams is that they are made for parsecscale jets having a conical shape, with modest opening angles (𜔠up to 10°), in accord with the VLBI observations of the nuclei of the nearest radio galaxies. Another motivating factor is the recent finding that consideration of a conical geometry can have important implications for the interpretation of a variety of radio observations of blazar jets. In addition to uniform jet flows (i.e., those having a uniform bulk Lorentz factor, ð›¤), computational results are also presented for stratified jets where an ultra-relativistic central spine along the jet axis is surrounded by a slower moving sheath, possibly arising from a velocity shear.
【 授权许可】
Unknown
【 预 览 】
Files | Size | Format | View |
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RO201912040493462ZK.pdf | 1514KB | download |