Hydrodynamic Instability of Ionization Front in HII Regions: From Linear to Nonlinear Evolution

Details Hydrodynamic Instability of Ionization Front in HII Regions: From Linear to Nonlinear Evolution Hydrodynamic Instability of Ionization Front in HII Regions: From Linear to Nonlinear Evolution

Jul 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005ap%26ss.298..197m&link_type=abstract

Astrophysics and Space Science, Volume 298, Issue 1-2, pp. 197-202

Astronomy and Astrophysics

Astrophysics

5

Hii Region, Molecular Cloud, Hydrodynamic Instability, Numerically

Scientific paper

We investigate hydrodynamic instabilities at an ionization front in a radiatively driven molecular cloud, using two-dimensional hydrodynamic simulations, including absorption of UV radiation from OB stars, recombination in HII gas, and radiative molecular cooling. We find a strong stabilization mechanism, if the initial perturbation is small, whereas column like structures can emerge, if the perturbation is large. Recombination plays a key role in the observed stabilization mechanism. When recombination is turned off in the simulations, the stabilization disappears, and the perturbation grows at a growth rate consistent with the classical Rayleigh Taylor instability.

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