Magnetic Curtailment of the Shock-Induced Thermal Instability

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

Effect of magnetic field on the thermal instability is studied in the radiatively cooling region behind an interstellarshock of moderate propagation velocity (~10 km/sec). It is shown that the presence of interstellar magnetic field of a few micro gause is very effective in preventing the thermal instability from building-up density concentration. In the absence of magnetic field, the shock-induced thermal instability amplifies preshock density inhomogeneity bye more than an order of magnitude. However, in the presence of magnetic field, the amplified density contrast is shown to be only a factor 2.

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