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Radiation-magnetohydrodynamic simulations of the photoionisation of magnetised globules
Stockholm University, Faculty of Science, Department of Astronomy. Stockholm University, Faculty of Science, Department of Astronomy.
2008 (English)Other (Other academic)
Abstract [en]

We present the first three-dimensional radiation-magnetohydrodynamic simulations of the photoionisation of a dense, magnetised molecular globule by an external source of ultraviolet radiation. We find that, for the case of a strong ionising field, significant deviations from the non-magnetic evolution are only seen when the initial magnetic field threading the globule has an associated magnetic pressure that is greater than one hundred times the gas pressure. In such a strong-field case, the photoevaporating globule will adopt a flattened or "curled up" shape, depending on the initial field orientation, and magnetic confinement of the ionised photoevaporation flow can lead to recombination and subsequent fragmentation during advanced stages of the globule evolution. We find suggestive evidence that such magnetic effects may be important in the formation of bright, bar-like emission features in H II regions.

Place, publisher, year, pages
2008.
Series
Arxiv, 0810.1531
Identifiers
URN: urn:nbn:se:su:diva-17595OAI: oai:DiVA.org:su-17595DiVA: diva2:184116
Available from: 2009-01-19 Created: 2009-01-19Bibliographically approved

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http://arxiv.org/abs/0810.1531
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