Rotational Stabilization of Magnetically Collimated Jets

Abstract

We investigate the launching and stability of extragalactic jets through nonlinear magnetohydrodynamic (MHD) simulation and linear eigenmode analysis. In the simulations of jet evolution, a small-scale equilibrium magnetic arcade is twisted by a differentially rotating accretion disk. These simulations produce a collimated outflow which is unstable to the current driven m=1 kink mode for low rotational velocities of the accretion disk relative to the Alfven speed of the coronal plasma. The growth rate of the kink mode in the jet is shown to be inversely related to the rotation rate of the disk, and the jet is stable for high rotation rates. Linear MHD calculations investigate the effect of rigid rotation on the kink mode in a cylindrical plasma. These calculations show that the Coriolis force distorts the m=1 kink eigenmode and stabilizes it at rotation frequencies such that the rotation period is longer than a few Alfven times.

17 pages, 21 figures, final published version, updated to include a discussion of the effect of rotation on increasing magnetic pitch equilibria

References in corpus (3)

• Kink instabilities in jets from rotating magnetic fields
• The inner jet of radio galaxy NGC 315 as observed with Chandra and the VLA
• Sheared Flow As A Stabilizing Mechanism In Astrophysical Jets

Cited by in corpus (7)

• Spatial Growth of the Current-Driven Instability in Relativistic Jets
• Three-Dimensional Relativistic Magnetohydrodynamic Simulations of Current-Driven Instability with A Sub-Alfvenic Jet: Temporal Properties
• Linear stability analysis of magnetized relativistic rotating jets
• Linear stability analysis of magnetized jets: the rotating case
• Linear and nonlinear evolution of current-carrying highly magnetized jets
• Enhanced toroidal flow stabilization of edge localized modes with increased plasma density
• Modeling the Parker instability in a rotating plasma screw pinch