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Title:
The Challenges of Low-Frequency Radio Polarimetry: Lessons from the Murchison Widefield Array
Authors:
Lenc, E.; Anderson, C. S.; Barry, N.; Bowman, J. D.; Cairns, I. H.; Farnes, J. S.; Gaensler, B. M.; Heald, G.; Johnston-Hollitt, M.; Kaplan, D. L.; Lynch, C. R.; McCauley, P. I.; Mitchell, D. A.; Morgan, J.; Morales, M. F.; Murphy, Tara; Offringa, A. R.; Ord, S. M.; Pindor, B.; Riseley, C.; Sadler, E. M.; Sobey, C.; Sokolowski, M.; Sullivan, I. S.; O'Sullivan, S. P.; Sun, X. H.; Tremblay, S. E.; Trott, C. M.; Wayth, R. B.
Affiliation:
AA(School of Physics, Sydney Institute for Astronomy, The University of Sydney, NSW 2006, Australia; ARC Centre of Excellence for All-sky Astrophysics (CAASTRO) 0000-0002-9994-1593), AB(CSIRO Astronomy and Space Science (CASS), 26 Dick Perry Ave, Kensington, WA 6151, Australia), AC(Department of Physics, University of Washington, Seattle, WA 98195, USA), AD(School of Earth and Space Exploration, Arizona State University, Tempe, AZ 85287, USA), AE(School of Physics, The University of Sydney, NSW 2006, Australia), AF(Department of Astrophysics/IMAPP, Radboud University, PO Box 9010, NL-6500 GL Nijmegen, The Netherlands), AG(School of Physics, Sydney Institute for Astronomy, The University of Sydney, NSW 2006, Australia; ARC Centre of Excellence for All-sky Astrophysics (CAASTRO); Dunlap Institute for Astronomy and Astrophysics, University of Toronto, 50 St. George Street, Toronto, ON M5S 3H4, Canada 0000-0002-3382-9558), AH(CSIRO Astronomy and Space Science (CASS), 26 Dick Perry Ave, Kensington, WA 6151, Australia), AI(School of Chemical & Physical Sciences, Victoria University of Wellington, Wellington 6140, New Zealand; Peripety Scientific Ltd., PO Box 11355 Manners Street, Wellington 6142, New Zealand), AJ(Department of Physics, University of Wisconsin-Milwaukee, Milwaukee, WI 53201, USA 0000-0001-6295-2881), AK(School of Physics, Sydney Institute for Astronomy, The University of Sydney, NSW 2006, Australia; ARC Centre of Excellence for All-sky Astrophysics (CAASTRO)), AL(School of Physics, The University of Sydney, NSW 2006, Australia), AM(ARC Centre of Excellence for All-sky Astrophysics (CAASTRO); CSIRO Astronomy and Space Science (CASS), PO Box 76, Epping, NSW 1710, Australia), AN(ARC Centre of Excellence for All-sky Astrophysics (CAASTRO); International Centre for Radio Astronomy Research, Curtin University, Bentley, WA 6102, Australia), AO(Department of Physics, University of Washington, Seattle, WA 98195, USA), AP(School of Physics, Sydney Institute for Astronomy, The University of Sydney, NSW 2006, Australia; ARC Centre of Excellence for All-sky Astrophysics (CAASTRO)), AQ(ASTRON, The Netherlands Institute for Radio Astronomy, Postbus 2, 7990 AA, Dwingeloo, The Netherlands), AR(ARC Centre of Excellence for All-sky Astrophysics (CAASTRO); CSIRO Astronomy and Space Science (CASS), PO Box 76, Epping, NSW 1710, Australia), AS(ARC Centre of Excellence for All-sky Astrophysics (CAASTRO); School of Physics, The University of Melbourne, Parkville, VIC 3010, Australia), AT(CSIRO Astronomy and Space Science (CASS), 26 Dick Perry Ave, Kensington, WA 6151, Australia), AU(School of Physics, Sydney Institute for Astronomy, The University of Sydney, NSW 2006, Australia; ARC Centre of Excellence for All-sky Astrophysics (CAASTRO)), AV(CSIRO Astronomy and Space Science (CASS), 26 Dick Perry Ave, Kensington, WA 6151, Australia; International Centre for Radio Astronomy Research, Curtin University, Bentley, WA 6102, Australia), AW(ARC Centre of Excellence for All-sky Astrophysics (CAASTRO); International Centre for Radio Astronomy Research, Curtin University, Bentley, WA 6102, Australia 0000-0001-5772-338X), AX(Department of Physics, University of Washington, Seattle, WA 98195, USA), AY(Instituto de Astronomía, Universidad Nacional Autónoma de México (UNAM), A.P. 70-264, 04510 México, D.F., Mexico), AZ(School of Physics and Astronomy, Yunnan University, Kunming, 650500, China), BA(ARC Centre of Excellence for All-sky Astrophysics (CAASTRO); International Centre for Radio Astronomy Research, Curtin University, Bentley, WA 6102, Australia), BB(ARC Centre of Excellence for All-sky Astrophysics (CAASTRO); International Centre for Radio Astronomy Research, Curtin University, Bentley, WA 6102, Australia 0000-0001-6324-1766), BC(ARC Centre of Excellence for All-sky Astrophysics (CAASTRO); International Centre for Radio Astronomy Research, Curtin University, Bentley, WA 6102, Australia 0000-0002-6995-4131)
Publication:
Publications of the Astronomical Society of Australia, Volume 34, id.e040 17 pp. (PASA Homepage)
Publication Date:
09/2017
Origin:
CUP
Astronomy Keywords:
polarization, radio continuum: general, techniques: polarimetric
Abstract Copyright:
2017: Astronomical Society of Australia
DOI:
10.1017/pasa.2017.36
Bibliographic Code:
2017PASA...34...40L

Abstract

We present techniques developed to calibrate and correct Murchison Widefield Array low-frequency (72-300 MHz) radio observations for polarimetry. The extremely wide field-of-view, excellent instantaneous (u, v)-coverage and sensitivity to degree-scale structure that the Murchison Widefield Array provides enable instrumental calibration, removal of instrumental artefacts, and correction for ionospheric Faraday rotation through imaging techniques. With the demonstrated polarimetric capabilities of the Murchison Widefield Array, we discuss future directions for polarimetric science at low frequencies to answer outstanding questions relating to polarised source counts, source depolarisation, pulsar science, low-mass stars, exoplanets, the nature of the interstellar and intergalactic media, and the solar environment.
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