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Survey of the Magellanic Clouds at 4.8 and 8.64 GHz

Published online by Cambridge University Press:  01 July 2008

John Dickel ,
Robert A. Gruendl ,
Vincent McIntyre ,
Shaun Amy  and
Douglas Milne
John Dickel
Affiliation:
Physics and Astronomy Bldng., MSC07-4220, U. New Mexico, Albuquerque NM 87131, USA email: [email protected]
Robert A. Gruendl
Affiliation:
UI Astronomy Bldng, 1002 West Green St, Urbana IL 61801, USA email: [email protected]
Vincent McIntyre
Affiliation:
ATNF-CSIRO Box 76. Epping NSW 1710, Australia email: [email protected], [email protected], [email protected]
Shaun Amy
Affiliation:
ATNF-CSIRO Box 76. Epping NSW 1710, Australia email: [email protected], [email protected], [email protected]
Douglas Milne
Affiliation:
ATNF-CSIRO Box 76. Epping NSW 1710, Australia email: [email protected], [email protected], [email protected]
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Abstract

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Detailed 4.8 and 8.64 GHz radio images of the entire Large and Small Magellanic Clouds with half-power beamwidths of 35″ at 4.8 GHz and 22″ at 8.64 GHz have been obtained using the Australia Telescope Compact Array. Full polarimetric observations were made. Several thousand mosaic positions were used to cover an area of 6° on a side for the LMC and 4.5° for the SMC. These images have sufficient spatial resolution (~ 8 and 5 pc, respectively) and sensitivity (3σ of 1.5 mJy beam−1) to identify most of the individual supernova remnants and H ii regions and also, in combination with available data from the Parkes 64-m telescope, the structure of the smooth emission in these galaxies. We have recently revised the early data analysis (Dickel et al. 2005) by increasing the CLEAN cutoff limit to recover more intermediate-spacing data and thus present more accurate brightnesses for extended sources. In addition, limited data using the sixth antenna at 4.5 – 6 km baselines are available to distinguish bright point sources (< 3″ and 2″, respectively) and to help estimate sizes of individual sources smaller than the resolution of the full survey. The resulting database will be valuable for statistical studies and comparisons with X-ray, optical, and infrared surveys of the LMC with similar resolution.

Keywords

instrumentation: interferometerssurveysISM: generalMagellanic Clouds
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S256: The Magellanic System: Stars, Gas, and Galaxies , July 2008 , pp. 14 - 19
Copyright
Copyright © International Astronomical Union 2009

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