The origin of intergalactic magnetic fields due to extragalactic jets

Astronomy and Astrophysics – Astronomy

Scientific paper

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Cosmic Plasma, Extragalactic Radio Sources, Galactic Clusters, Galactic Nuclei, Interstellar Magnetic Fields, Plasma Jets, Radio Jets (Astronomy), Active Galaxies, Astronomical Models, Cosmology, Density Distribution, Jet Flow, Lorentz Force

Scientific paper

The paper studies large-scale magnetization of intra- and intercluster media due to electric current-carrying extragalactic jets generated by active periods of galactic nuclei. The Lorentz force acting on the return current path has an expansive character which is responsible for the generation of a growing magnetic cocoon surrounding the associated jet. It is shown that such growing cocoons can be the source of intergalactic magnetization. The everlasting character of currents generated in the highly conductive protogalactic or generic intergalactic media provides the long-term action of such an electrodynamic expansion, and the large-scale character of this magnetization process. The model is specifically applied to Cygnus A, NGC 6251, 3C 465, and M84, where several peculiar features of magnetic nature have been observed; and to the formation of large-scale cells of intergalactic magnetic field. The model can account, both qualitatively and quantitatively, for several previously unsolved large-scale magnetic features.

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