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Title:
A Novel Technique for Wide-Field Polarimetry with a Radio Telescope Array
Authors:
McConnell, D.; Carretti, E.; Subrahmanyan, R.
Affiliation:
AA(Australia Telescope National Facility, CSIRO, Epping, NSW 1710, Australia), AB(INAF-Istituto di Astrofísica Spaziale e Fisica Cosmica Bologna, Via Gobetti 101, Bologna I-40129, Italy), AC(Australia Telescope National Facility, CSIRO, Narrabri, NSW 2390, Australia)
Publication:
The Astronomical Journal, Volume 131, Issue 1, pp. 648-653. (AJ Homepage)
Publication Date:
01/2006
Origin:
UCP
AJ Keywords:
Methods: Observational, Techniques: Polarimetric
DOI:
10.1086/498061
Bibliographic Code:
2006AJ....131..648M

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.
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