Polarization and energy content of parsec scale AGN jets

Details Polarization and energy content of parsec scale AGN jets Polarization and energy content of parsec scale AGN jets

2004-11-15

arxiv.org/abs/astro-ph/0411402v1

Astronomy and Astrophysics

Astrophysics

4 pages, Proceedings of the workshop "Multiband Approach to AGN", Max-Planck-Institut fur Radioastronomie, Bonn September 30 -

Scientific paper

Most of energy carried by relativistic AGN jets remains undetected until hundreds of kiloparsecs where interaction with intergalactic medium produces hot spots. The jet's hidden energy is only partially dissipated at smaller scales, from parsecs to kiloparsecs. Several media may play the role of the ``prime mover'': ions, pairs or large scale magnetic fields. Analyzing VLBI polarization structures of relativistic parsec scale jets we conclude that large-scale magnetic fields can explain the salient polarization properties of parsec-scale AGN jets. This implies that large-scale magnetic fields carry a non-negligible fraction of jet luminosity. We also discuss the possibility that relativistic AGN jets may be electromagnetically (Poynting flux) dominated. In this case, dissipation of the toroidal magnetic field (and not fluid shocks) may be responsible for particle acceleration.

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