Magnetohydrodynamic wave propagation in one-dimensional nonhomogeneous, self-gravitating clouds

Details Magnetohydrodynamic wave propagation in one-dimensional nonhomogeneous, self-gravitating clouds Magnetohydrodynamic wave propagation in one-dimensional nonhomogeneous, self-gravitating clouds

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...412..146f&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 412, no. 1, p. 146-159.

Statistics

Computation

26

Computational Astrophysics, Gravitational Effects, Magnetohydrodynamic Waves, Star Formation, Wave Propagation, Interstellar Magnetic Fields, Magnetoacoustics, Molecular Clouds

Scientific paper

We study the propagation of magnetohydrodynamic (MHD) waves through nonhomogeneous, selfgravitating, magnetic media representative of molecular cloud environments and focus on the issues of cloud support and line profiles. Since the general treatment of this topic is burdened by a complex mathematical formalism, we consider simplifying geometries which yield analytical solutions in the linear wave limit. In particular, we study both magnetoacoustic and Alfven wave propagation along the density gradient in a one-imensional slab. Of specific relevance to molecular clouds, we find that the back reaction of the Alfven waves can provide a pressure along the direction of the magnetic field lines; this pressure can help support a density enhancement against gravitational collapse. Furthermore, we find that the velocity amplitudes of these waves increase as the density decreases, in rough agreement with observational estimates of line width versus density relations.

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