Interaction of a nonstationary ionization-shock front with an inhomogeneous interstellar medium |
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| Authors: | K V Krasnobaev |
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| Institution: | (1) Moscow State University, Vorob’evy gory, Moscow, 119899, Russia |
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| Abstract: | We consider the interaction of an ionization-shock front with isothermal waves in an H I region. Based on a two-front model in the linear approximation, we have detected a significant (approximately by an order of magnitude) periodic amplification of perturbations as they penetrate from the interstellar medium into an H II region. Numerical simulations have revealed that even when the shock-and ionization-front velocities differ and the relative density perturbations in the interstellar medium are ～10?1, the variations in gas parameters near the ionization front are comparable to those observed at the boundaries of H II regions. |
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| Keywords: | interstellar medium shock waves ionization fronts instabilities H II regions |
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