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Infrared properties of ultracompact H II regions in the Galaxy and the LMC

Published online by Cambridge University Press:  01 August 2006

Marta Sewiło ,
Ed Churchwell  and
Barbara Whitney
Marta Sewiło
Affiliation:
Space Science Institute, 4750 Walnut Street, Suite 205, Boulder, CO 80301, USA email: sewilo@astro.wisc.edu
Ed Churchwell
Affiliation:
University of Wisconsin – Madison, 475 N. Charter Street, Madison, WI 53706, USA
Barbara Whitney
Affiliation:
Space Science Institute, 4750 Walnut Street, Suite 205, Boulder, CO 80301, USA email: sewilo@astro.wisc.edu
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Abstract

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We report the preliminary results of the study on the infrared properties of ultracompact (UC) H II regions in our Galaxy and in the Large Magellanic Cloud (LMC) based on the GLIMPSE (the Galactic Legacy Infrared Mid-Plane Survey Extraordinaire) and SAGE (Surveying the Agents of a Galaxy's Evolution) data, respectively. We found that ~60% of the Galactic UC H II regions do not have IR counterparts. Large extinction and very strong stellar winds evacuating H II regions from dust may explain this result. The same effect is observed in the LMC. One of the goals of this research is to develop a means of identifying UC H IIs based on their mid-IR properties, e.g. positions on color-color and color-magnitude plots and/or shape of spectral energy distributions. GLIMPSE showed that bow shocks, protostellar jets/outflows, and bubbles are common phenomena in massive star formation regions (MSFRs).

Keywords

stars: formationISM: HII regionsinfrared: stars
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S237: Triggered Star Formation in a Turbulent ISM , August 2006 , pp. 472
Copyright
Copyright © International Astronomical Union 2007