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HII radiative transfer revealed by ionization parameter mapping

Published online by Cambridge University Press:  05 March 2015

M. S. Oey ,
E. W. Pellegrini ,
P. F. Winkler ,
S. D. Points ,
R. C. Smith ,
A. E. Jaskot  and
J. Zastrow
M. S. Oey
Affiliation:
Astronomy Department, University of Michigan, Ann Arbor, MI 48109-1042, USA
E. W. Pellegrini*
Affiliation:
Astronomy Department, University of Michigan, Ann Arbor, MI 48109-1042, USA
P. F. Winkler
Affiliation:
Department of Physics, Middlebury College, Middlebury, VT 05753, USA
S. D. Points
Affiliation:
Cerro Tololo Inter-American Observatory, Casilla 603, La Serena, Chile
R. C. Smith
Affiliation:
Cerro Tololo Inter-American Observatory, Casilla 603, La Serena, Chile
A. E. Jaskot
Affiliation:
Astronomy Department, University of Michigan, Ann Arbor, MI 48109-1042, USA
J. Zastrow
Affiliation:
Astronomy Department, University of Michigan, Ann Arbor, MI 48109-1042, USA
*
†Present address: Dept of Physics & Astronomy, University of Toledo, Toledo, OH 43606-3390
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Abstract

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We develop the technique of ionization parameter mapping (IPM) to probe the optical depth of Hii regions, applying our method to the Magellanic Clouds. Our results dramatically clarify the radiative transfer in these galaxies. Based on Sii, Oiii, and Hα imaging from the Magellanic Clouds Emission Line Survey, we find that the frequency of optically thin objects correlates strongly with Hα luminosity and correlates inversely with Hi column density. The aggregate escape fraction for the Lyman continuum is sufficient to ionize the diffuse, warm ionized medium, but the galactic escape fraction is dominated by the few largest Hii regions. The quantitative trends are similar in both the LMC and SMC in spite of their different star formation and Hi properties.

Keywords

radiative transferstars: early-typeHii regionsgalaxies: ISM
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Highlights H16: Highlights of Astronomy , August 2012 , pp. 587 - 589
Copyright
Copyright © International Astronomical Union 2015 

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