Self-gravitational instability of rotating anisotropic heat-conducting plasma

Details Self-gravitational instability of rotating anisotropic heat-conducting plasma Self-gravitational instability of rotating anisotropic heat-conducting plasma

Jan 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008phpl...15a2107p&link_type=abstract

Physics of Plasmas, Volume 15, Issue 1, pp. 012107-012107-8 (2008).

Physics

4

Magnetohydrodynamics And Plasmas, Interstellar Medium And Nebulae In External Galaxies, Characteristics And Properties Of External Galaxies And Extragalactic Objects

Scientific paper

The self-gravitational instability of rotating anisotropic heat-conducting plasma with modified Chew-Goldberger-Low equations is investigated. The general dispersion relation is obtained using normal mode analysis by constructing the linearized set of equations. This dispersion relation is further reduced for propagation parallel and perpendicular to the direction of magnetic field. These conditions are discussed for axis of rotation along and perpendicular to the magnetic field. It is found that the heat flux vector does not influence the transverse mode of propagation for both cases of rotation and Jeans condition remains unchanged. In case of propagation parallel to the magnetic field with axis of rotation perpendicular to the magnetic field, we get the dispersion relation, which shows the joint effect of rotation and heat flux vector. The two separate modes of propagation are obtained in terms of rotation and heat flux vector for rotation parallel to the magnetic field. It is demonstrated that the Alfvén wave and the associated firehose instability are not affected by the presence of heat flux corrections and rotation also. The numerical analysis is performed to show the effect of rotation, pressure anisotropy, and heat flux parameter on the condition of instability in the spiral arms of galaxy. The Jeans condition of gravitational instability is obtained for both the cases of propagation.

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