THE UNIVERSAL TIME-EVOLUTION OF AN EXPANDING HII REGION
We present new models for the expansion of an HII region into a uniform environment. With a thin-shell model and with full, gasdynamic (+radiative transfer), spherically symmetric simulations, we demonstrate that observed HII regions are in a parameter regime for which there is a universal, dimensio...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2012 |
| País: | México |
| Institución: | Universidad Nacional Autónoma de México |
| Repositorio: | Redalyc-UNAM |
| OAI Identifier: | oai:redalyc.org:57124416011 |
| Acceso en línea: | https://www.redalyc.org/articulo.oa?id=57124416011 |
| Access Level: | acceso abierto |
| Palabra clave: | Física, Astronomía y Matemáticas HII regions ISM: evolution stars: formation ISM: kinematics and dynamics |
| Sumario: | We present new models for the expansion of an HII region into a uniform environment. With a thin-shell model and with full, gasdynamic (+radiative transfer), spherically symmetric simulations, we demonstrate that observed HII regions are in a parameter regime for which there is a universal, dimensionless expansion law. This universal expansion solution is derived from the thin shell model and fromthe numerical simulations. A comparison between the two types of model shows that the thin shell formalism is valid only for the early phases of the HII region expansion. Finally, we tabulate the "universal law" (derived from the spherically symmetric simulations) and give an analytic approximation to this law, which can be scaled to obtain the radius vs. time of any observed HII region. |
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