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Title: Novel technique for wide-field polarimetry with a radio telescope array
Authors: McConnell, D.
Carretti, E.
Subrahmanyan, Ravi
Keywords: Methods: Observational
Techniques: Polarimetric
Issue Date: Jan-2006
Publisher: The University of Chicago Press for the American Astronomical Society
Citation: Astrophysical Journal, 2006, Vol.131, p648
Abstract: We report the use of the Australia Telescope Compact Array (ATCA) to conduct polarimetric observations of the sky at 5 GHz. The ATCA is normally operated as an interferometer array, but these observations were conducted in a split-array mode in which the antenna elements were used as single dishes with their beams staggered to simultaneously cover a wide area of sky with a resolution of 10'. The linearly polarized sky radiation was fully characterized from measurements, made over a range of parallactic angles, of the cross-correlated signals from the orthogonal linear feeds. We describe the technique and present a polarimetric image of the Vela supernova remnant made as a test of the method. The development of the technique was motivated by the need for wide-field imaging of the foreground contamination of the polarized component of the cosmic microwave background signal.
Description: Restricted Access.
ISSN: 0004-637X
1538-4357 (Online)
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Copyright: 2006 American Astronomical Society
Appears in Collections:Research Papers (A&A)

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