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2006MNRAS.369.1167L - Mon. Not. R. Astron. Soc., 369, 1167-1188 (2006/July-1)
Magnetic jets from swirling discs.
LYNDEN-BELL D.
Abstract (from CDS):
In a constant pressure environment, the magnetically dominated cavity is highly collimated and advances along the axis at a constant speed closely related to the maximum circular velocity of the accretion disc. Even within the cavity the field is strongly concentrated towards the axis. The twist in the jet field <Bφ>/<|Bz|> is close to and the width of the jet decreases upwards. By contrast, when the background pressure falls off with height with powers approaching z–4, the head of the jet accelerates strongly and the twist of the jet is much smaller. The width increases to give an almost conical magnetic cavity with apex at the source. Such a regime may be responsible for some of the longest strongly collimated jets. When the background pressure falls off faster than z–4, there are no quasi-static configurations of well-twisted fields and the pressure confinement is replaced by a dynamic effective pressure or a relativistic expansion. In the regimes with rapid acceleration, the outgoing and incoming fields linking the twist back to the source are almost anti-parallel so there is a possibility that magnetic reconnections may break up the jet into a series of magnetic `smoke-rings' travelling out along the axis.
Abstract Copyright: 2006 The Author. Journal compilation © 2006 RAS
Journal keyword(s): acceleration of particles - MHD - ISM: Herbig - Haro objects - galaxies: jets
CDS comments: In Chap 1.2 : IRG 10011 is a misprint for IRC +10011.
Simbad objects: 9
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