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Radiative Feedback in Galaxies

Published online by Cambridge University Press:  01 December 2007

M. S. Oey ,
E. S. Voges ,
R. A. M. Walterbos ,
G. R. Meurer ,
S. Yelda  and
E. Furst
M. S. Oey
Affiliation:
Department of Astronomy, 830 Dennison Building, University of Michigan, Ann Arbor, MI 48109-1042, U.S.A.
E. S. Voges
Affiliation:
Department of Astronomy, MSC 4500, New Mexico State University, P.O. Box 30001, Las Cruces, NM 88003, U.S.A.
R. A. M. Walterbos
Affiliation:
Department of Astronomy, MSC 4500, New Mexico State University, P.O. Box 30001, Las Cruces, NM 88003, U.S.A.
G. R. Meurer
Affiliation:
Johns Hopkins University, Department of Physics and Astronomy, 3400 North Charles Street, Baltimore, MD 21218-2686, U.S.A.
S. Yelda
Affiliation:
University of California, Department of Physics and Astronomy, P.O. Box 951547, Los Angeles, CA 90095-1547, U.S.A.
E. Furst
Affiliation:
344 Greenlow Road, Catonsville, MD 21228, U.S.A.
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Abstract

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We examine the fate of ionizing radiation from massive stars on global scales. First, we compare the observed Hα luminosities of LMC Hii regions with those predicted by the latest generation of stellar atmosphere models. Our results imply that classical Hii regions are on average radiation-bounded, rather than density-bounded, as we found a decade ago. This is likely to necessitate an additional ionizing source for the diffuse, warm ionized medium (WIM) in galaxies. Secondly, we present new results from the SINGG Hα galaxy survey, showing that starburst galaxies have a lower fraction of WIM emission than normal star-forming galaxies. The most intriguing and consequential possible cause for this effect is the escape of ionizing radiation from starbursts. We show that the observations are also consistent with our predictions for the escape of ionizing radiation. Nevertheless, other observations do not necessarily support this scenario and other possible explanations must be considered.

Keywords

stars: atmospheres – stars: early-type – galaxies: evolution – galaxies: ISM – galaxies: starburst – Hii regions – intergalactic medium – Magellanic Clouds
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S250: Massive Stars as Cosmic Engines , December 2007 , pp. 385 - 390
Copyright
Copyright © International Astronomical Union 2008

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