Physics
Scientific paper
Nov 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..dppqp1008t&link_type=abstract
American Physical Society, 44th Annual Meeting of the Division of Plasma , abstract #QP1.008
Physics
Scientific paper
Radio-loud active galactic nuclei (AGN) is known to harbor a super-massive black hole of the order 10^8 solar mass. Gravitational energy on the order of 1 solar mass per year is thought to be released through accretion. A persisting theoretical challenge is to explain the spectacular radio-jet extended on the order of 100 kpc along the axis of accretion. Differential rotation of the accretion disk can efficiently inject both magnetic energy and magnetic helicity perpendicular to the disk by running mostly parallel current along the poloidal magnetic field anchored on the disk surface. The difficulty was shown by Lynden-Bell that a quasi-static force-free plasma is inconsistent with a collimated jet. Collimation can be achieved if the force-free assumption is weakly violated by introducing an ambient gas pressure far away from the disk. The magnetic field can also undergo dynamically self-collimation without pressure gradient by the pinching effect of the toroidal curvature of the strong toroidal field. This is shown to depend on the ratio of the disk rotation speed and the poloidal Alfvén speed. For super-Alfvén disk differential rotation, the twist of the field line can not be redistributed fast enough by the poloidal Alfvén dynamics that curvature force of strong toroidal field near the axis of accretion is sufficiently to pinch the jet. For sub-Alfvén disk rotation, differential twist of the field line is adequately relaxed that Lynden-Bell's force-free solution is recovered.
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