Formation of a gas condensation in a perturbed shock

Astronomy and Astrophysics – Astronomy

Scientific paper

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Interstellar Gas, Molecular Clouds, Shock Discontinuity, Shock Fronts, Star Formation, Hydrodynamic Equations, Oblique Shock Waves, Two Dimensional Models

Scientific paper

Results of two-dimensional hydrodynamical simulations are presented of formation of gas condensations in the compressed gas behind a disturbed shock front. A plane standing shock wave in a quasi-steady state is considered as an unperturbed state, and a perturbation is applied to this state that slightly distorts and displaces the shock front from the unperturbed position. The responses of the gas flow to the perturbation are followed numerically with special attention to formation of gas condensations behind the shock front. The formation of gas condensations behind a disturbed shock front naturally explains observed clumpiness of shock-compressed regions of molecular gas clouds and would play an important role in formation of stars triggered by shock waves.

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