Physics
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000immm.proc...93s&link_type=abstract
The interstellar medium in M31 and M33. Proceedings 232. WE-Heraeus Seminar, 22-25 May 2000, Bad Honnef, Germany. Edited by El
Physics
Scientific paper
We investigate the dynamics of a three-fluid plasma consisting of electrons, ions and charged dust particles. In our work the plasma is illuminated by a radiation field which, through absorption, accelerates these dust particles. By direct and Coulomb collisions the gained momentum is partially transmitted to electrons and ions. A steady state can be achieved by an external gravitational field acting against the radiation. After presenting the steady state flow, linear perturbations of dynamical variables with the wave vector perpendicular to the radiation flux are considered. It is demonstrated that when the drag force between ions and dust particles is a decreasing function of their relative velocity, the steady state is unstable against the formation of neighbouring regions with high and low relative flow velocities, ie. multiple current sheets or flux tubes. The results of multifluid simulations of the interstellar medium are shown to elucidate the relevance of this instability for the formation of the observed dust filaments in edge-on galaxies.
Schröer A.
Shchekinov Yu.
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