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Evolution of H II regions in hierarchically structured molecular clouds


Shabala, SS and Ellingsen, SP and Kurtz, SE and Forbes, LK, Evolution of H II regions in hierarchically structured molecular clouds, Monthly Notices of the Royal Astronomical Society, 372, (1) pp. 457-466. ISSN 0035-8711 (2006) [Refereed Article]

DOI: doi:10.1111/j.1365-2966.2006.10883.x


We present observations of the H91α recombination line emission towards a sample of nine H II regions associated with 6.7-GHz methanol masers, and report arcsecond-scale emission around compact cores. We derive physical parameters for our sources, and find that although simple hydrostatic models of region evolution reproduce the observed region sizes, they significantly underestimate emission measures. We argue that these findings are consistent with young source ages in our sample, and can be explained by existence of density gradients in the ionized gas. © 2006 RAS.

Item Details

Item Type:Refereed Article
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Galactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Shabala, SS (Associate Professor Stas Shabala)
UTAS Author:Ellingsen, SP (Professor Simon Ellingsen)
UTAS Author:Forbes, LK (Professor Larry Forbes)
ID Code:40618
Year Published:2006
Funding Support:Australian Research Council (DP0342478)
Web of Science® Times Cited:4
Deposited By:Physics
Deposited On:2006-08-01
Last Modified:2007-03-21

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