On the Magnetogravitational Instability of a Ferromagnetic Dust Cloud in the Presence of Nonuniform Rotation. (16th August 2012)

• Record Type: Journal Article
• Authors: Dhiman, Joginder S.; Dadwal, Rekha
• Other Names: Bogovalov S. Academic Editor.; Engelbracht C. W. Academic Editor.; Hawkes R. Academic Editor.
• Is Part Of: ISRN astronomy and astrophysics. Volume 2012(2012)
• Publication Date: 2012-08-16
• Subjects: Astronomy -- Periodicals; Astrophysics -- Periodicals; Astronomy; Astrophysics; Electronic journals; Periodicals; Electronic journals; 520
• DOI: 10.5402/2012/104941
• Languages: English
• ISSNs: 2090-4738

Abstract

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.