Cosmic ray moderation of the thermal instability

Wagner, A.Y., Falle, S.A.E.G., Hartquist, T.W. and Pittard, J.M. (2005) Cosmic ray moderation of the thermal instability. Astronomy and Astrophysics, 430 (2). pp. 567-569. ISSN 0004-6361

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Abstract

We apply the Hermite-Bieler theorem in the analysis of the effect of cosmic rays on the thermal stability of an initially uniform, static background. The cosmic rays were treated in a fluid approximation and the diffusion coefficient was assumed to be constant in time and space. The inclusion of cosmic rays does not alter the criterion for the thermal stability of a medium subjected to isobaric perturbations. It does alter the criteria for the stability of a medium perturbed by small amplitude sound waves. In the limit of a high background cosmic ray pressure to thermal pressure ratio, the instability in response to high frequency sound waves is suppressed.

Item Type:	Article
Copyright, Publisher and Additional Information:	© ESO 2005
Keywords:	ISM, kinematics, dynamics, cosmic rays, hydrodynamics, instabilities
Academic Units:	The University of Leeds > Faculty of Maths and Physical Sciences (Leeds) > School of Physics and Astronomy (Leeds) The University of Leeds > Faculty of Maths and Physical Sciences (Leeds) > School of Mathematics (Leeds) > Applied Mathematics (Leeds)
Depositing User:	Repository Assistant
Date Deposited:	02 Jun 2006
Last Modified:	08 Feb 2013 17:02
Published Version:	http://www.edpsciences.org/articles/aa/abs/2005/05...
Status:	Published
Publisher:	EDP Sciences
Refereed:	Yes
Identification Number:	10.1051/0004-6361:20042138
URI:	http://eprints.whiterose.ac.uk/id/eprint/1250

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