Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007japa...28...29g&link_type=abstract
Journal of Astrophysics & Astronomy, vol. 28, no. 1, p. 29-40
Astronomy and Astrophysics
Astrophysics
1
Blazars: General, Galaxies: Active, Quasars, Jets, Nuclei, Radio Continuum.
Scientific paper
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 (υapp = cβapp) and the effective Doppler boosting factor (δeff ) of the relativistically moving radio knot. A novel aspect of these analytical computations of β-δ diagrams is that they are made for parsecscale jets having a conical shape, with modest opening angles (ω 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, Γ), 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.
Dhurde Samir
Gopal-Krishna
Sircar Pronoy
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