Assessing the Role of Several Stellar Feedback Mechanisms in the Giant HII Region 30 Doradus

Details Assessing the Role of Several Stellar Feedback Mechanisms in the Giant HII Region 30 Doradus Assessing the Role of Several Stellar Feedback Mechanisms in the Giant HII Region 30 Doradus

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21541502l&link_type=abstract

American Astronomical Society, AAS Meeting #215, #415.02; Bulletin of the American Astronomical Society, Vol. 42, p.261

Astronomy and Astrophysics

Astronomy

1

Scientific paper

Observational data suggests that star formation is an inefficient and slow process, and the cause may be the injection of energy and momentum by stellar processes that prevents free-fall collapse of molecular clouds. The mechanism of this stellar feedback is currently debated: potential sources of pressure include the classical HII region gas, the hot gas generated by shocked stellar winds, the direct radiation of stars, and the dust-processed infrared (IR) radiation field trapped inside the HII shell. In this presentation, we assess observationally the role of these different modes of stellar feedback within the giant HII region 30 Doradus in the Large Magellanic Cloud. We analyze images at many wavelengths (radio, IR, optical, UV, and X-ray) of 30 Dor to measure the dominant pressures as a function of position within 30 Doradus. Based on the hot gas and IR radiation pressures and luminosities, we determine how effectively these components are trapped inside or leak outside the expanding bubble, an issue that is uncertain theoretically. These calculations are a first step to probe systematically the individual mechanisms of stellar feedback and their ability to regulate the dynamics of star-forming regions.

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