Stability and Nonlinear Time Evolution of Cool Condensations

Details Stability and Nonlinear Time Evolution of Cool Condensations Stability and Nonlinear Time Evolution of Cool Condensations

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pcim.conf..148i&link_type=abstract

The Physics and Chemistry of the Interstellar Medium, Proceedings of the 3rd Cologne-Zermatt Symposium, held in Zermatt, Septemb

Physics

1

Scientific paper

Conditions for stability of cool condensations imbedded in hot optically thin plasmas are analyzed. The gas is assumed to be cooled by the standard cooling function for plasmas with solar abundances and the interphase (hot/cool) sustained by electron non-saturated heat diffusion. Expanding and imploding cool spherical structures with radius R, particle density n, and temperature T, are analyzed by a zero order approximation. The phase trajectories are represented on the plane (nR, T) for different initial and boundary conditions, relevant to the Interstellar Medium, as well as different physical conditions of the surrounding hot gas. In particular, it is found that if the density of the hot gas scales as r^{-ω }, the dynamical evolution of the cool structure sensitively depends on ω. For well defined values of the relevant parameters, there are quasi- isothermal expanding cool structures.

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