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The Spitzer spectroscopic survey of the Small Magellanic Cloud: polycyclic aromatic hydrocarbon emission from SMC star-forming regions

Published online by Cambridge University Press:  01 July 2008

Karin M. Sandstrom ,
Alberto D. Bolatto ,
Snežana Stanimirović ,
J. D. T. Smith ,
Jacco Th. van Loon  and
Adam K. Leroy
Karin M. Sandstrom
Affiliation:
Dept. of Astronomy, University of California, Berkeley, 601 Campbell Hall, Berkeley CA 94720USA email: karin@astro.berkeley.edu
Alberto D. Bolatto
Affiliation:
Dept. of Astronomy & Laboratory for Millimeter-wave Astronomy, University of Maryland, College Park, College Park, MD 20742USA
Snežana Stanimirović
Affiliation:
Dept. of Astronomy, University of Wisconsin, Madison, Madison, WI 53706USA
J. D. T. Smith
Affiliation:
Ritter Astrophysical Research Center, University of Toledo, Toledo, OH 43603USA
Jacco Th. van Loon
Affiliation:
Astrophysics Group, Lennard-Jones Laboratories, Keele University, Staffordshire ST5 5BG, UK
Adam K. Leroy
Affiliation:
Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany
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Abstract

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Because of its proximity, the Small Magellanic Cloud provides a unique opportunity to map the polycyclic aromatic hydrocarbon (PAH) emission from photo-dissociation regions (PDRs) in a low-metallicity (12 + log(O/H) ~ 8) galaxy at high spatial resolution in order to learn about their abundance and physical state. We present mid-IR spectral mapping observations of star-forming regions in the Small Magellanic Cloud obtained as part of the Spitzer Spectroscopic Survey of the SMC (S4MC) project. These observations allow us to map the distribution of PAH emission in these regions and the measure the variation of PAH band strengths with local physical conditions. In these proceedings we discuss preliminary results on the physical state of the PAHs, in particular their ionization fraction.

Keywords

dustextinctionHII regionsISM: moleculesgalaxies: individual (SMC)Magellanic Cloudsinfrared: ISM
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S256: The Magellanic System: Stars, Gas, and Galaxies , July 2008 , pp. 160 - 165
Copyright
Copyright © International Astronomical Union 2009

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