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On the Propagation and Structure of Ionization Fronts

Published online by Cambridge University Press:  03 August 2017

F. A. Goldsworthy
F. A. Goldsworthy*
Affiliation:
Manchester University, Manchester, England

Extract

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The problem discussed here is that of determining the motion of a cloud of neutral atomic hydrogen gas, when it is subjected to ionizing radiation from a star embedded in it. Initially the gas is in gravitational equilibrium at a constant temperature of about 100°K. It is supposed that at time t=0 the star suddenly begins to radiate with a certain intensity, which remains constant thereafter. Part of the surrounding gas will be ionized and an ionization front (separating the ionized gas from the neutral gas) will move outwards into the neutral gas. A shock wave may also propagate ahead of the ionization front into the neutral gas. There will therefore be two regions to consider—a region of ionized gas (HII region) and a region of neutral gas (HI region) in which there may be a shock.

Type
Part VI: Conditions at the Ionization and Shock Fronts in Collisions of Gas Clouds
Information
Symposium - International Astronomical Union , Volume 8: Cosmical Gas Dynamics , July 1958 , pp. 1062 - 1068
Copyright
Copyright © American Physical Society 1958 

References

1 Kahn, F. D., Bull. Astron. Soc. Neth. No. 456, 197 (1956).Google Scholar