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    A survey for transients and variables with the Murchison Widefield Array 32-tile prototype at 154 MHz

    193848_193848.pdf (887.1Kb)
    Access Status
    Open access
    Authors
    Trott, Cathryn
    Hurley-Walker, Natasha
    Wayth, Randall
    Macquart, Jean-Pierre
    Arcus, Wayne
    Emrich, David
    Herne, David
    Lynch, Mervyn
    Ord, Stephen
    Tingay, Steven
    Waterson, Mark
    Williams, Andrew
    Bell, M.
    Murphy, T.
    Kaplan, D.
    Hancock, P.
    Gaensler, B.
    Banyer, J.
    Bannister, K.
    Barnes, D.
    Bernardi, G.
    Bowman, J.
    Briggs, F.
    Bunton, J.
    Cappallo, R.
    Corey, B.
    Deshpande, A.
    deSouza, L.
    Goeke, R.
    Greenhill, L.
    Hazelton, B.
    Hewitt, J.
    Johnston-Hollitt, M.
    Kasper, J.
    Kincaid, B.
    Koenig, R.
    Kratzenberg, E.
    Lonsdale, C.
    McWhirter, S.
    Mitchell, D.
    Morales, M.
    Morgan, E.
    Oberoi, D.
    Pathikulangara, J.
    Prabu, T.
    Remillard, R.
    Rogers, A.
    Roshi, A.
    Salah, J.
    Sault, R.
    Udaya Shankar, N.
    Srivani, K.
    Stevens, J.
    Subrahmanyan, R.
    Webster, R.
    Whitney, A.
    Williams, C.
    Wyithe, J.
    Date
    2013
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Bell, M.E. and Murphy, T. and Kaplan, D.L. and Hancock, P. and Gaensler, B.M. and Banyer, J. and Bannister, K. et al. 2013. A survey for transients and variables with the Murchison Widefield Array 32-tile prototype at 154 MHz. Monthly Notices of the Royal Astronomical Society. 438 (1): pp. 352-367.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1093/mnras/stt2200
    ISSN
    0035-8711
    Remarks

    Copyright © 2013 The Authors. Published by Oxford University Press on behalf of Royal Astronomical Society. All rights reserved.

    URI
    http://hdl.handle.net/20.500.11937/35596
    Collection
    • Curtin Research Publications
    Abstract

    We present a search for transient and variable radio sources at 154 MHz with the Murchison Widefield Array 32-tile prototype. Fifty-one images were obtained that cover a field of view of 1430 deg2 centred on Hydra A. The observations were obtained over three days in 2010 March and three days in 2011 April and May. The mean cadence of the observations was 26 minutes and there was additional temporal information on day and year timescales. We explore the variability of a sample of 105 low frequency radio sources within the field. Four bright (S > 6 Jy) candidate variable radio sources were identified that displayed low levels of short timescale variability (26 minutes). We conclude that this variability is likely caused by simplifications in the calibration strategy or ionospheric effects. On the timescale of one year we find two sources that show significant variability. We attribute this variability to either refractive scintillation or intrinsic variability. No radio transients were identified and we place an upper limit on the surface density of sources p < 7.5 × 10-5 deg-2 with flux densities > 5.5 Jy, and characteristic timescales of both 26 minutes and one year.

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