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Issue A&A
Volume 442, Number 2, November I 2005
Page(s) L7 - L10
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:200500175



A&A 442, L7-L10 (2005)
DOI: 10.1051/0004-6361:200500175

Letter

Magnetic collimation of the relativistic jet in M 87

J. Gracia1, K. Tsinganos1 and S. V. Bogovalov2

1  IASA and Section of Astrophysics, Astronomy and Mechanics, Department of Physics, University of Athens, Panepistimiopolis, 157 84 Zografos, Athens, Greece
    e-mail: jgracia@phys.uoa.gr
2  Moscow Engineering Physics Institute (State University), Kashirskoje shosse 31, 115409 Moscow, Russia

(Received 5 August 2005 / Accepted 27 August 2005 )

Abstract
We apply a two-zone MHD model to the jet of M 87. The model consists of an inner relativistic outflow, which is surrounded by a non-relativistic outer disk-wind. The outer disk-wind collimates very well through magnetic self-collimation and confines the inner relativistic jet into a narrow region around the rotation axis. Further, we show by example, that such models reproduce very accurately the observed opening angle of the M 87 jet over a large range from the kiloparsec scale down to the sub-parsec scale.


Key words: MHD -- methods: numerical -- galaxies: jets -- galaxies: individual: M 87

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© ESO 2005


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