The heating of cloud-hot phase interface regions by the dissipation of hydromagnetic waves

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Cosmic Plasma, Interstellar Matter, Magnetohydrodynamic Waves, Molecular Clouds, Wave Attenuation, Gas Heating, Gas Ionization, Mass Transfer, Rates (Per Time), Wave Equations

Scientific paper

Several processes occurring at the interfaces of molecular clouds and hot interstellar gas are characterized in terms of their effects on the resulting temperature and ionization structures. A pure conduction front is assumed and attention is given to Alfven waves propagating into a region possessing a temperature structure controlled by radiative losses and conduction. The discussion is constrained to a 100 K cloud embedded in a 500,000 K medium heated by soft X-rays and UV photons. It is shown that dissipation of the waves may lead to cloud evaporation. Cloud formation, however, would continue from the injection of new matter swept up by supernova shocks.

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