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    A search for long-time-scale, low-frequency radio transients

    251467.pdf (3.006Mb)
    Access Status
    Open access
    Authors
    Murphy, T.
    Kaplan, D.
    Croft, S.
    Lynch, C.
    Callingham, J.
    Bannister, K.
    Bell, M.
    Hurley-Walker, Natasha
    Hancock, Paul
    Line, J.
    Rowlinson, A.
    Lenc, E.
    Intema, H.
    Jagannathan, P.
    Ekers, Ronald
    Tingay, Steven
    Yuan, F.
    Wolf, C.
    Onken, C.
    Dwarakanath, K.
    For, B.
    Gaensler, B.
    Hindson, L.
    Johnston-Hollitt, M.
    Kapinska, A.
    McKinley, B.
    Morgan, J.
    Offringa, A.
    Procopio, P.
    Staveley-Smith, L.
    Wayth, Randall
    Wu, C.
    Zheng, Q.
    Date
    2017
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Murphy, T. and Kaplan, D. and Croft, S. and Lynch, C. and Callingham, J. and Bannister, K. and Bell, M. et al. 2017. A search for long-time-scale, low-frequency radio transients. Monthly Notices of the Royal Astronomical Society. 466 (2): pp. 1944-1953.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1093/mnras/stw3087
    ISSN
    0035-8711
    School
    Curtin Institute of Radio Astronomy (Physics)
    Remarks

    This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

    URI
    http://hdl.handle.net/20.500.11937/52622
    Collection
    • Curtin Research Publications
    Abstract

    We present a search for transient and highly variable sources at low radio frequencies (150-200 MHz) that explores long timescales of 1-3 years. We conducted this search by comparing the TIFR GMRT Sky Survey Alternative Data Release 1 (TGSS ADR1) and the GaLactic and Extragalactic All-sky Murchison Widefield Array (GLEAM) survey catalogues. To account for the different completeness thresholds in the individual surveys, we searched for compact GLEAM sources above a flux density limit of 100 mJy that were not present in the TGSS ADR1; and also for compact TGSS ADR1 sources above a flux density limit of 200 mJy that had no counterpart in GLEAM. From a total sample of 234 333 GLEAM sources and 275 612 TGSS ADR1 sources in the overlap region between the two surveys, there were 99658 GLEAM sources and 38 978 TGSS ADR sources that passed our flux density cutoff and compactness criteria. Analysis of these sources resulted in three candidate transient sources. Further analysis ruled out two candidates as imaging artefacts. We analyse the third candidate and show it is likely to be real, with a flux density of 182 +/- 26 mJy at 147.5 MHz. This gives a transient surface density of rho = (6.2 +/- 6) x 10-5 deg-2 . We present initial follow-up observations and discuss possible causes for this candidate. The small number of spurious sources from this search demonstrates the high reliability of these two new low-frequency radio catalogues.

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