The Dynamics of Radiation Pressure-Dominated HII Regions

Details The Dynamics of Radiation Pressure-Dominated HII Regions The Dynamics of Radiation Pressure-Dominated HII Regions

2009-06-23

arxiv.org/abs/0906.4343v4

Astrophys.J.703:1352-1362,2009

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

11 pages, 3 figures, emulateapj format, accepted to ApJ; minor arithmetic error in previous version corrected

Scientific paper

10.1088/0004-637X/703/2/1352

We evaluate the role of radiation pressure in the dynamics of HII regions. We first determine under what conditions radiation pressure is significant in comparison to gas pressure and show that, while radiation pressure is generally unimportant for HII regions driven by a handful of massive stars, it is dominant for the larger HII regions produced by the massive star clusters found near the Galactic center and in starburst environments. We then provide a solution for the problem of how HII regions expand when radiation pressure influences their behavior. Finally, we compare radiation-dominated HII regions to other sources of stellar feedback, and argue that HII regions are probably the primary mechanism for regulating the formation of massive star clusters.

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