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Title:
The POlarised GLEAM Survey (POGS) I: First results from a low-frequency radio linear polarisation survey of the southern sky
Authors:
Riseley, C. J.; Lenc, E.; Van Eck, C. L.; Heald, G.; Gaensler, B. M.; Anderson, C. S.; Hancock, P. J.; Hurley-Walker, N.; Sridhar, S. S.; White, S. V.
Affiliation:
AA(CSIRO Astronomy and Space Science, PO Box 1130, Bentley, WA 6102, Australia 0000-0002-3369-1085), AB(CSIRO Astronomy and Space Science, PO Box 76, Epping, NSW 1710, Australia; School of Physics, Sydney Institute for Astronomy, The University of Sydney, NSW 2006, Australia 0000-0002-9994-1593), AC(Department of Physics and Astronomy, University of Calgary, Calgary, Alberta T2N 1N4, Canada; Dunlap Institute for Astronomy and Astrophysics, 50 St. George St, University of Toronto, ON M5S 3H4, Canada 0000-0002-7641-9946), AD(CSIRO Astronomy and Space Science, PO Box 1130, Bentley, WA 6102, Australia), AE(Dunlap Institute for Astronomy and Astrophysics, 50 St. George St, University of Toronto, ON M5S 3H4, Canada 0000-0002-3382-9558), AF(CSIRO Astronomy and Space Science, PO Box 1130, Bentley, WA 6102, Australia), AG(International Centre for Radio Astronomy Research, Curtin University, Bentley, WA 6102, Australia 0000-0002-4203-2946), AH(International Centre for Radio Astronomy Research, Curtin University, Bentley, WA 6102, Australia), AI(Netherlands Institute for Radio Astronomy (ASTRON), Postbus 2, 7990 AA, Dwingeloo, The Netherlands), AJ(International Centre for Radio Astronomy Research, Curtin University, Bentley, WA 6102, Australia 0000-0002-2340-8303)
Publication:
Publications of the Astronomical Society of Australia, Volume 35, pp. - (PASA Homepage)
Publication Date:
12/2018
Origin:
CUP
Astronomy Keywords:
galaxies: active, polarization, radio continuum: general, surveys
Abstract Copyright:
2018: Astronomical Society of Australia
DOI:
10.1017/pasa.2018.39
Bibliographic Code:
2018PASA...35...43R

Abstract

The low-frequency polarisation properties of radio sources are poorly studied, particularly in statistical samples. However, the new generation of low-frequency telescopes, such as the Murchison Widefield Array (the precursor for the low-frequency component of the Square Kilometre Array) offers an opportunity to probe the physics of radio sources at very low radio frequencies. In this paper, we present a catalogue of linearly polarised sources detected at 216 MHz, using data from the Galactic and Extragalactic All-sky Murchison Widefield Array survey. Our catalogue covers the Declination range -17° to -37° and 24 h in Right Ascension, at a resolution of around 3 arcminutes. We detect 81 sources (including both a known pulsar and a new pulsar candidate) with linearly polarised flux densities in excess of 18 mJy across a survey area of approximately 6 400 deg2, corresponding to a surface density of 1 source per 79 deg2. The level of Faraday rotation measured for our sources is broadly consistent with those recovered at higher frequencies, with typically more than an order of magnitude improvement in the uncertainty compared to higher-frequency measurements. However, our catalogue is likely incomplete at low Faraday rotation measures, due to our practice of excluding sources in the region where instrumental leakage appears. The majority of sources exhibit significant depolarisation compared to higher frequencies; however, a small sub-sample repolarise at 216 MHz. We also discuss the polarisation properties of four nearby, large-angular-scale radio galaxies, with a particular focus on the giant radio galaxy ESO 422-G028, in order to explain the striking differences in polarised morphology between 216 MHz and 1.4 GHz.
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