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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
A 189 MHz, 2400 deg2 polarization survey with the murchison widefield array 32-element prototype
Astrophysical Journal, Volume 771, No. 2, Article 105, Year 2013
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Description
We present a Stokes I, Q and U survey at 189 MHz with the Murchison Widefield Array 32 element prototype covering 2400 deg2. The survey has a 15.6 arcmin angular resolution and achieves a noise level of 15 mJy beam-1. We demonstrate a novel interferometric data analysis that involves calibration of drift scan data, integration through the co-addition of warped snapshot images, and deconvolution of the point-spread function through forward modeling. We present a point source catalog down to a flux limit of 4 Jy. We detect polarization from only one of the sources, PMN J0351-2744, at a level of 1.8% ± 0.4%, whereas the remaining sources have a polarization fraction below 2%. Compared to a reported average value of 7% at 1.4 GHz, the polarization fraction of compact sources significantly decreases at low frequencies. We find a wealth of diffuse polarized emission across a large area of the survey with a maximum peak of 13 K, primarily with positive rotation measure values smaller than +10 rad m-2. The small values observed indicate that the emission is likely to have a local origin (closer than a few hundred parsecs). There is a large sky area at α ≥ 2h30 m where the diffuse polarized emission rms is fainter than 1 K. Within this area of low Galactic polarization we characterize the foreground properties in a cold sky patch at (α, δ) = (4h, -27.°6) in terms of three-dimensional power spectra. © 2013. The American Astronomical Society. All rights reserved.
Authors & Co-Authors
Bernardi, Gianni
United States, Cambridge
Harvard-smithsonian Center for Astrophysics
Greenhill, Lincoln J.
United States, Cambridge
Harvard-smithsonian Center for Astrophysics
Mitchell, Daniel A.
Australia, Melbourne
University of Melbourne
Australia, Sydney
Arc Centre of Excellence for All-sky Astrophysics
Ord, Stephen M.
Australia, Perth
International Centre for Radio Astronomy Research
Hazelton, Bryna J.
United States, Seattle
University of Washington
Gaensler, B. M.
Australia, Sydney
Arc Centre of Excellence for All-sky Astrophysics
Australia, Sydney
The University of Sydney
de Oliveira-Costa, Angélica
United States, Cambridge
Harvard-smithsonian Center for Astrophysics
Morales, Miguel F.
United States, Seattle
University of Washington
Udaya-Shankar, N.
India, Bengaluru
Raman Research Institute
Subrahmanyan, Ravi
Australia, Sydney
Arc Centre of Excellence for All-sky Astrophysics
India, Bengaluru
Raman Research Institute
Wayth, Randall B.
Australia, Sydney
Arc Centre of Excellence for All-sky Astrophysics
Australia, Perth
International Centre for Radio Astronomy Research
Lenc, Emil
Australia, Sydney
Arc Centre of Excellence for All-sky Astrophysics
Australia, Sydney
The University of Sydney
Williams, Christopherl L.M.
United States, Cambridge
Mit Kavli Institute for Astrophysics and Space Research
Arcus, Wayne R.
Australia, Perth
International Centre for Radio Astronomy Research
Arora, Balwinder Singh
Australia, Perth
International Centre for Radio Astronomy Research
Barnes, David G.
Australia, Hawthorn
Swinburne University of Technology
Bowman, Judd D.
United States, Tempe
Arizona State University
Briggs, Franklin H.
Australia, Sydney
Arc Centre of Excellence for All-sky Astrophysics
Australia, Canberra
The Australian National University
Bunton, John D.
Australia, Canberra
Commonwealth Scientific and Industrial Research Organisation
Cappallo, Roger J.
United States, Westford
Mit Haystack Observatory
Corey, Brian E.
United States, Westford
Mit Haystack Observatory
Deshpande, Avinash A.
India, Bengaluru
Raman Research Institute
DeSouza, Ludi
Australia, Sydney
The University of Sydney
Australia, Canberra
Commonwealth Scientific and Industrial Research Organisation
Emrich, David
Australia, Perth
International Centre for Radio Astronomy Research
Goeke, Robert F.
United States, Cambridge
Mit Kavli Institute for Astrophysics and Space Research
Herne, David E.
Australia, Perth
International Centre for Radio Astronomy Research
Hewitt, Jacqueline N.
United States, Cambridge
Mit Kavli Institute for Astrophysics and Space Research
Johnston-Hollitt, Melanie
New Zealand, Wellington
Victoria University of Wellington
Kaplan, David L.A.
United States, Milwaukee
University of Wisconsin-milwaukee
Kasper, Justin C.
United States, Cambridge
Harvard-smithsonian Center for Astrophysics
Kincaid, Barton B.
United States, Westford
Mit Haystack Observatory
Koenig, Ronald
Australia, Canberra
Commonwealth Scientific and Industrial Research Organisation
Kratzenberg, Eric
United States, Westford
Mit Haystack Observatory
Lonsdale, Colin J.
United States, Westford
Mit Haystack Observatory
Lynch, Mervyn J.
Australia, Perth
International Centre for Radio Astronomy Research
McWhirter, Stephen Russell
United States, Westford
Mit Haystack Observatory
Morgan, Edward H.
United States, Cambridge
Mit Kavli Institute for Astrophysics and Space Research
Oberoi, Divya
India, Mumbai
Tata Institute of Fundamental Research, Mumbai
Pathikulangara, Joseph
Australia, Canberra
Commonwealth Scientific and Industrial Research Organisation
Prabu, Thiagaraj
India, Bengaluru
Raman Research Institute
Remillard, Ronald A.
United States, Cambridge
Mit Kavli Institute for Astrophysics and Space Research
Rogers, Alan E.E.
United States, Westford
Mit Haystack Observatory
Roshi, Anish A.
India, Bengaluru
Raman Research Institute
Salah, Joseph E.
United States, Westford
Mit Haystack Observatory
Sault, Robert J.
Australia, Melbourne
University of Melbourne
Srivani, K. S.
India, Bengaluru
Raman Research Institute
Stevens, Jamie B.
Australia, Hobart
University of Tasmania
Tingay, Steven John
Australia, Sydney
Arc Centre of Excellence for All-sky Astrophysics
Australia, Perth
International Centre for Radio Astronomy Research
Waterson, Mark F.
Australia, Perth
International Centre for Radio Astronomy Research
Australia, Canberra
The Australian National University
Webster, Rachel L.
Australia, Melbourne
University of Melbourne
Australia, Sydney
Arc Centre of Excellence for All-sky Astrophysics
Whitney, Alan R.
United States, Westford
Mit Haystack Observatory
Williams, Andrew J.
Australia, Perth
The University of Western Australia
Wyithe, J. S.B.
Australia, Melbourne
University of Melbourne
Australia, Sydney
Arc Centre of Excellence for All-sky Astrophysics
Statistics
Citations: 87
Authors: 53
Affiliations: 18
Identifiers
Doi:
10.1088/0004-637X/771/2/105
ISSN:
0004637X
Research Areas
Environmental
Study Design
Cross Sectional Study
Study Approach
Quantitative