On the Magnetic Field in Quasar and FR II Large-Scale Jets

Details On the Magnetic Field in Quasar and FR II Large-Scale Jets On the Magnetic Field in Quasar and FR II Large-Scale Jets

2005-01-27

arxiv.org/abs/astro-ph/0501610v1

Astronomy and Astrophysics

Astrophysics

4 pages, 6 figures included. Proceedings of the Workshop `22nd Texas Symposium on Relativistic Astrophysics', Palo Alto, Dec.

Scientific paper

Here we report systematic comparison of the spectral properties of large-scale jets, hotspots and extended lobes in quasars and FR II radio galaxies recently observed with Chandra and ASCA. We argue that if the strong X-ray emission of the jet knots in these objects results from comptonisation of the CMB photons, as usually considered, the powerful large-scale jets are most likely far from the minimum-power condition in the sense that the magnetic field thereby is below equipartition. We also show that the X-ray emission of the hot-spots and lobes in the compiled dataset agrees with the minimum-power condition. In this context, we point out the need for substantial amplification of the magnetic field within the terminal shocks of powerful large-scale jets of quasars and FR II sources.

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