Breaking the sound barrier in recombination fronts

Details Breaking the sound barrier in recombination fronts Breaking the sound barrier in recombination fronts

1995-12-18

arxiv.org/abs/astro-ph/9512116v1

Astronomy and Astrophysics

Astrophysics

Accepted for publication in MNRAS. LaTeX, 7 pages, 6 Postscript figures. Also available at http://axp2.ast.man.ac.uk:8000/Prep

Scientific paper

We exploit a generic instability in the integration of steady, sonic, near-isothermal flows to find the complete transition diagram for recombination fronts (for a model system of equations). The instability requires the integration of the flow equations for speeds between the isothermal and adiabatic sound speeds to be performed with particular care. As a result of this, the previous work of Newman & Axford on the structure of recombination fronts neglected an important class of solution, that of transonic fronts; our method is readily extensible to a more complete treatment of the ionization structure. Future papers will apply these results in models of the structure of ultracompact HII regions.

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