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Title:
Physical Conditions in the Ionized Gas of 30 Doradus
Authors:
Indebetouw, R.; de Messières, G. E.; Madden, S.; Engelbracht, C.; Smith, J. D.; Meixner, M.; Brandl, B.; Smith, L. J.; Boulanger, F.; Galliano, F.; Gordon, K.; Hora, J. L.; Sewilo, M.; Tielens, A. G. G. M.; Werner, M.; Wolfire, M. G.
Affiliation:
AA(Department of Astronomy, University of Virginia, P.O. Box 3818, Charlottesville, VA 22903, USA ; National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903, USA ; ), AB(Department of Astronomy, University of Virginia, P.O. Box 3818, Charlottesville, VA 22903, USA ), AC(Service d'Astrophysique CEA, Saclay, 91191 Gif Sur Yvette Cedex, France ), AD(Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85719, USA ), AE(Department of Physics and Astronomy, Mail Drop 111, University of Toledo, 2801 West Bancroft Street, Toledo, OH 43606, USA ), AF(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA ), AG(Leiden Observatory, Leiden University, P.O. Box 9513, 2300 RA Leiden, Netherlands ), AH(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA ; Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK ), AI(Astrophysique de Paris, Institute (IAP), CNRS UPR 341, 98bis, Boulevard Arago, Paris F-75014, France ), AJ(Department of Astronomy, University of Maryland, College Park, MD 20742, USA ), AK(Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85719, USA ), AL(Center for Astrophysics, 60 Garden Street, MS 67, Harvard University, Cambridge, MA 02138, USA ), AM(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA ), AN(NASA Ames Research Center, SOFIA Office, MS 211-3, Moffet Field, CA 94035, USA ), AO(Jet Propulsion Lab, 4800 Oak Grove Dr., MS 264-767, Pasadena, CA 91109, USA), AP(Department of Astronomy, University of Maryland, College Park, MD 20742, USA )
Publication:
The Astrophysical Journal, Volume 694, Issue 1, pp. 84-106 (2009). (ApJ Homepage)
Publication Date:
03/2009
Origin:
IOP
ApJ Keywords:
H II regions, infrared: ISM, ISM: individual: 30 Doradus, Magellanic Clouds
DOI:
10.1088/0004-637X/694/1/84
Bibliographic Code:
2009ApJ...694...84I

Abstract

We present a mid-infrared spectroscopic data cube of the central part of 30 Doradus, observed with Spitzer's Infrared Spectrograph and Multiband Imaging Photometer for Spitzer/spectral energy distribution mode. Aromatic dust emission features and emission lines from molecular and atomic hydrogen are detected but they are not particularly strong. The dominant spectral features are emission lines from moderately ionized species of argon, neon, and sulfur, which are used to determine the physical conditions in the ionized gas. The ionized gas excitation shows strong variations on parsec scales, some of which can plausibly be associated with individual hot stars. We fit the ionic line strengths with photoionization and shock models, and find that photoionization dominates in the region. The ionization parameter U traces the rim of the central bubble, as well as highlighting isolated sources of ionization, and at least one quiescent clump. The hardness of the ionizing radiation field T rad reveals several "hot spots" that are either the result of individual very hot stars or trace the propagation of the diffuse ionizing field through the surrounding neutral cloud. Consistent with other measurements of giant H II regions, log(U) ranges between -3 and -0.75, and T rad between 30,000 and 85,000 K.
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