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The cometary HII regions of DR 21 : bow shocks or champagne flows or both?

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Cyganowski_2014_A_A_Cometary.pdf (5.096Mb)
Date
03/2014
Author
Immer, K.
Cyganowski, Claudia Jane
Reid, M. J.
Menten, K. M.
Keywords
astro-ph.GA
HII regions
Stars: formation
ISM: Individual objects: DR21
ISM: kinematics and dynamics
Radio lines: ISM
QB Astronomy
QC Physics
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Abstract
We present deep Very Large Array H66α radio recombination line (RRL) observations of the two cometary H II regions in DR 21. With these sensitive data, we test the “hybrid” bow shock/champagne flow model previously proposed for the DR 21 H II regions. The ionized gas down the tail of the southern H II region is redshifted by up to ~30 km s-1 with respect to the ambient molecular gas, as expected in the hybrid scenario. The RRL velocity structure, however, reveals the presence of two velocity components in both the northern and southern H II regions. This suggests that the ionized gas is flowing along cone-like shells, swept-up by stellar winds. The observed velocity structure of the well-resolved southern H II region is most consistent with a picture that combines a stellar wind with stellar motion (as in bow shock models) along a density gradient (as in champagne flow models). The direction of the implied density gradient is consistent with that suggested by maps of dust continuum and molecular line emission in the DR 21 region.
Citation
Immer , K , Cyganowski , C J , Reid , M J & Menten , K M 2014 , ' The cometary HII regions of DR 21 : bow shocks or champagne flows or both? ' , Astronomy & Astrophysics , vol. 563 , A39 . https://doi.org/10.1051/0004-6361/201321736
Publication
Astronomy & Astrophysics
Status
Peer reviewed
DOI
https://doi.org/10.1051/0004-6361/201321736
ISSN
0004-6361
Type
Journal article
Rights
Reproduced with permission from Astronomy & Astrophysics, © ESO
Description
C.J.C. is supported by an NSF Astronomy and Astrophysics Postdoctoral Fellowship under award AST-1003134.
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/5926

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