Theoretical studies of interstellar molecular shocks. I - General formulation and effects of the ion-molecule chemistry

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Gas-Ion Interactions, Interstellar Chemistry, Interstellar Gas, Magnetohydrodynamics, Molecular Clouds, Shock Wave Propagation, Conservation Equations, Differential Equations, Endothermic Reactions, Kinetic Energy, Plasma Interactions

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The authors present a formulation of the problem of magnetohydrodynamic shock propagation through an interstellar cloud in a form which is adapted to the inclusion of the ion-molecule chemistry. Continuous (C-type) shocks are considered and comparison is made with the earlier work of Draine (1980) and of Draine, Roberge and Dalgarno (1983), in which ion-molecule reactions were neglected. The authors find that the inclusion of endothermic ion-molecule reactions, driven by the relative streaming of the ionized and neutral fluids, has a profound effect on the shock structure. In particular, the width of the shock is greatly enhanced and the maximum temperature attained by the neutral gas is much reduced.

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