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• W3102308844 abstract "We present analytical modelling of conical relativistic jets, in order to evaluate the role of the jet opening angle on certain key parameters that are inferred from very long baseline interferometry (VLBI) radio observations of blazar nuclear jets. The key parameters evaluated are the orientation angle (i.e. the viewing angle) of the jet and the apparent speed and Doppler factor of the radio knots on parsec scales. Quantitative comparisons are made of the influence of the jet opening angle on the above parameters of the radio knots, as would be estimated for two widely discussed variants of relativistic nuclear jets, namely, those having uniform bulk speed and those in which the bulk Lorentz factor of the flow decreases with distance from the jet axis (a ‘spine–sheath’ flow). Our analysis shows that for both types of jet velocity distributions, the expectation value of the jet orientation angle at first falls dramatically with increases in the (central) jet Lorentz factor, but it levels off at a fraction of the opening angle for extremely relativistic jets. We also find that the effective values of the apparent speeds and Doppler factors of the knots always decline substantially with increasing jet opening angle, but this effect is strongest for ultra-relativistic jets with uniform bulk speed. We suggest that the paucity of highly superluminal parsec-scale radio components in TeV blazars can be understood if their jets are highly relativistic and, being intrinsically weaker, somewhat less well collimated, in comparison to the jets in other blazars." @default.
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• W3102308844 date "2007-05-01" @default.
• W3102308844 modified "2023-09-23" @default.
• W3102308844 title "Influence of the jet opening angle on the derived kinematical parameters of blazar jets having uniform and stratified bulk motion" @default.
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• W3102308844 doi "https://doi.org/10.1111/j.1365-2966.2007.11633.x" @default.
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