Generation of the magnetic field in jets

Details Generation of the magnetic field in jets Generation of the magnetic field in jets

2006-05-22

arxiv.org/abs/astro-ph/0605562v1

Astronomy and Astrophysics

Astrophysics

7 pages, accepted for publication in A&A

Scientific paper

10.1051/0004-6361:20064863

We consider dynamo action under the combined influence of turbulence and large-scale shear in sheared jets. Shear can stretch turbulent magnetic field lines in such a way that even turbulent motions showing mirror symmetry become suitable for generation of a large-scale magnetic field. We derive the integral induction equation governing the behaviour of the mean field in jets. The main result is that sheared jets may generate a large-scale magnetic field if shear is sufficiently strong. The generated mean field is mainly concentrated in a magnetic sheath surrounding the central region of a jet, and it exhibits sign reversals in the direction of the jet axis. Typically, the magnetic field in a sheath is dominated by the component along the jet that can reach equipartition with the kinetic energy of particles, The field in the central region of jets has a more disordered structure.

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