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Search for High-Extinction Regions in the Small Magellanic Cloud

Published online by Cambridge University Press:  21 October 2010

M.-Y. Lee ,
S. Stanimirović ,
J. Ott ,
J. Th. van Loon ,
A. D. Bolatto ,
P. A. Jones ,
M. R. Cunningham ,
K. E. Devine  and
J. M. Oliveira
M.-Y. Lee
Affiliation:
Department of Astronomy, University of Wisconsin-Madison, USA email: lee@astro.wisc.edu
S. Stanimirović
Affiliation:
Department of Astronomy, University of Wisconsin-Madison, USA email: lee@astro.wisc.edu
J. Ott
Affiliation:
National Radio Astronomy Observatory
J. Th. van Loon
Affiliation:
Astrophysics Group, Keele University
A. D. Bolatto
Affiliation:
Department of Astronomy, University of Maryland
P. A. Jones
Affiliation:
School of Physics, University of New South Wales Departamento de Astronomia, Universidad de Chile
M. R. Cunningham
Affiliation:
School of Physics, University of New South Wales
K. E. Devine
Affiliation:
Department of Astronomy, University of Wisconsin-Madison, USA email: lee@astro.wisc.edu
J. M. Oliveira
Affiliation:
Astrophysics Group, Keele University
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We have applied the unsharp-masking technique to the 24 μm image of the SMC, obtained with the Spitzer, to search for high-extinction regions. Fifty-five candidate regions of high-extincion (namely high-contrast regions, HCRs) have been identified from the decremental contrast image. HCRs have a size of 8 - 14 pc and a peak contrast at 24 μm of 2 - 2.5%. To constrain physical properties of HCRs, we have performed observations of NH3, N2H+, HNC, HCO+, and HCN toward one of the HCRs, HCR LIRS36–east, using the ATCA and the Mopra telescope. No molecular line emission detected, but upper limits to column densities of molecular species suggest that HCRs are moderately dense with n ~ 103 cm−3. Two interesting properties of HCRs are shown below.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Highlights H15: Highlights of Astronomy , November 2009 , pp. 412
Copyright
Copyright © International Astronomical Union 2010

References

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