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    The POlarised GLEAM Survey (POGS) I : First results from a low-frequency radio linear polarisation survey of the southern sky

    74372.pdf (24.43Mb)
    Access Status
    Open access
    Authors
    Riseley, C.
    Lenc, E.
    Van Eck, C.
    Heald, G.
    Gaensler, B.
    Anderson, C.
    Hancock, Paul
    Hurley-Walker, Natasha
    Sridhar, S.
    White, S.
    Date
    2018
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Riseley, C. and Lenc, E. and Van Eck, C. and Heald, G. and Gaensler, B. and Anderson, C. and Hancock, P. et al. 2018. The POlarised GLEAM Survey (POGS) I : First results from a low-frequency radio linear polarisation survey of the southern sky. Publications of the Astronomical Society of Australia. 35: Article ID e043.
    Source Title
    Publications of the Astronomical Society of Australia
    DOI
    10.1017/pasa.2018.39
    ISSN
    1323-3580
    School
    Curtin Institute of Radio Astronomy (Physics)
    URI
    http://hdl.handle.net/20.500.11937/74087
    Collection
    • Curtin Research Publications
    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 (MWA; 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 MWA (GLEAM) survey. Our catalogue covers the Declination range $-17^{\circ}$ to $-37^{\circ}$ and 24 hours in Right Ascension, at a resolution of around 3 arcminutes. We detect 81 sources (including both a known pulsar and new pulsar candidate) with linearly-polarised flux densities in excess of 18 mJy across a survey area of approximately 6400 square degrees, corresponding to a surface density of 1 source per 79 square degrees. 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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