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Resolving the Transition from Molecular to Atomic at 1/5 Solar Metallicity in the Small Magellanic Cloud

Part of: IAU Issue 315 - From Interstellar Clouds...

Published online by Cambridge University Press:  12 September 2016

Katherine E. Jameson ,
Alberto D. Bolatto ,
Mark Wolfire ,
Monica Rubio ,
Rodrigo Herrera Camus  and
the HS Collaboration
Katherine E. Jameson
Affiliation:
Astronomy Department and Laboratory for Millimeter-wave Astronomy, University of Maryland, College Park, MD, 20742, USA email: kjameson@astro.umd.edu
Alberto D. Bolatto
Affiliation:
Astronomy Department and Laboratory for Millimeter-wave Astronomy, University of Maryland, College Park, MD, 20742, USA email: kjameson@astro.umd.edu
Mark Wolfire
Affiliation:
Astronomy Department and Laboratory for Millimeter-wave Astronomy, University of Maryland, College Park, MD, 20742, USA email: kjameson@astro.umd.edu
Monica Rubio
Affiliation:
Departamento de Astronomía, Universidad de Chile, Camino El Observatorio 1515, Casilla 36-D, Santiago, Chile
Rodrigo Herrera Camus
Affiliation:
Astronomy Department and Laboratory for Millimeter-wave Astronomy, University of Maryland, College Park, MD, 20742, USA email: kjameson@astro.umd.edu Max-Planck-Institut für Extraterrestrische Physik, Giessenbachstrasse, D-85748 Garching, Germany
the HS Collaboration
Affiliation:
Max-Planck-Institut für Extraterrestrische Physik, Giessenbachstrasse, D-85748 Garching, Germany
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Abstract

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At a distance of 61 kpc, the Small Magellanic Cloud (SMC) affords an absolutely unique view of the low metallicity star-forming interstellar medium, providing the nearest laboratory to study processes relevant to star formation at high redshifts. We present new ALMA 7m-array maps of CO and 12CO (2-1) for one of the four observed regions in the Southwest Bar of the SMC. These maps are the first high-resolution (~6″ ~ 1.7 pc) images of CO in a molecular cloud at 1/5 Solar metallicity. We show the structure of photodissociation regions for the first time at 1/5 Solar metallicity by combining the new ALMA data with Herschel maps of [C ii] and [O i]. We present preliminary evidence that there is extended, faint 12CO (2-1) emission near where we expect the Hi-to-H2 transition. We also compare our data to the low metallicity 3D simulations by Glover & Mac Low (2011) and Shetty et al. (2011).

Keywords

ISM: cloudsISM: structuregalaxies: ISMMagellanic Clouds
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S315: From Interstellar Clouds to Star-Forming Galaxies: Universal Processes? , August 2015 , pp. 13 - 16
Copyright
Copyright © International Astronomical Union 2016 

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