Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-11-17
Mon.Not.Roy.Astron.Soc.366:1465-1474,2006
Astronomy and Astrophysics
Astrophysics
10 pages, 3 figures. v2 accepted by MNRAS with no changes from v1, but updated to add a citation to a recent paper
Scientific paper
10.1111/j.1365-2966.2005.09923.x
By considering a small sample of core-dominated radio-loud quasars with X-ray jets, I show, as has been argued previously by others, that the observations require bulk jet deceleration if all of the X-ray emission is to be explained using the widely adopted beamed inverse-Compton model, and argue that jets even in these powerful objects must have velocity structure in order to reconcile their radio and X-ray properties. I then argue that the deceleration model has several serious weaknesses, and discuss the viability of alternative models for the decline in X-ray/radio ratio as a function of position. Although inverse-Compton scattering from the jets is a required process and must come to dominate at high redshifts, adopting an alternative model for the X-ray emission of some nearby, well-studied objects can greatly alleviate some of the problems posed by these observations for the beamed inverse-Compton model.
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