Table of Contents
ISRN Astronomy and Astrophysics
Volume 2012, Article ID 104941, 6 pages
http://dx.doi.org/10.5402/2012/104941
Research Article

On the Magnetogravitational Instability of a Ferromagnetic Dust Cloud in the Presence of Nonuniform Rotation

Department of Mathematics, Himachal Pradesh University, Summer Hill, Shimla 171005, India

Received 10 April 2012; Accepted 6 June 2012

Academic Editors: S. Bogovalov, C. W. Engelbracht, and R. Hawkes

Copyright © 2012 Joginder S. Dhiman and Rekha Dadwal. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The effect of a nonuniform magnetic field on the gravitational instability of a nonuniformly rotating infinitely extending axisymmetric cylinder in a homogenous ferromagnetic medium has been studied. The propagation of the wave is allowed along radial direction. A general dispersion relation, using the normal mode analysis method on the perturbation equations of the problem, is obtained. It is found that Bel and Schatzman criterion determines the gravitational instability of this general problem. Thus, it appears that the effect of non-uniform magnetic field on the gravitational instability as discussed by (Dhiman and Dadwal, 2010) is marginalized by the magnetic polarizability of ferrofluid.