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Astron. Astrophys. 360, 290-296 (2000)
Models of wave supported clumps in giant molecular clouds
R.F. Coker,
J.G.L. Rae and
T.W. Hartquist
University of Leeds, Department of Physics and Astronomy, Leeds LS2 9JT, UK (robc@ast.leeds.ac.uk; jglr@ast.leeds.ac.uk; twh@ast.leeds.ac.uk)
Received 29 February 2000 / Accepted 24 May 2000
Abstract
We present plane-parallel equilibrium models of molecular clumps that are supported by Alfvén waves damped by the linear process of ion-neutral friction. We used a WKB approximation to treat the inward propagation of waves and adopted a realistic ionization structure influenced by dissociation and ionization due to photons of external origin. The model clumps contain central condensations surrounded by lower density envelopes and are more condensed than those obtained for an assumed ionization structure, used in some previous studies, that is more appropriate for dark regions. In some parameter regimes the structures of clumps depend sensitively on the assumed depletions of Sulphur and metals.
Key words: ISM:
clouds 
ISM: magnetic
fields
turbulence
waves
Send offprint requests to: R.F. Coker
Contents
- 1. Introduction
- 2. Equations of wave propagation and static equilibrium
- 3. Calculations of the ionization structure
- 4. Details of the models
- 5. Results and conclusions
- Acknowledgements
- Appendix: two-fluid linear treatment of Alfvén waves
- References
© European Southern Observatory (ESO) 2000
Online publication: July 27, 2000
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