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Gravitational stability of a cylindrical plasma with an azimuthal and an axial magnetic field

McLeman, J. A. and Wang, C. H. -T. and Bingham, R. (2012) Gravitational stability of a cylindrical plasma with an azimuthal and an axial magnetic field. Astrophysical Journal, 756 (2). ISSN 0004-637X

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Abstract

We consider the gravitational stability of a current-carrying filamentary cloud in the presence of both axial and azimuthal magnetic fields using a simple analytic model. The azimuthal magnetic field is shown to give rise to a new contribution, dictated by Ampere's law, in the corresponding virial equation for magnetohydrodynamic equilibrium. From this we obtain a computationally inexpensive guidance on the gravitational stability of current-carrying filamentary clouds. The approach not only provides a fresh insight into the essential physical mechanisms involved but also demonstrates clearly that, for sufficiently large and yet astronomically realistic currents, the azimuthal magnetic field can cause filamentary clouds to undergo instability.

Item type: Article
ID code: 42255
Keywords: magnetic fields, star formation, plasma, Physics, Astronomy and Astrophysics, Space and Planetary Science
Subjects: Science > Physics
Department: Faculty of Science > Physics
Related URLs:
Depositing user: Pure Administrator
Date Deposited: 04 Dec 2012 16:58
Last modified: 27 Mar 2014 10:44
URI: http://strathprints.strath.ac.uk/id/eprint/42255

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