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    Limits on Fast Radio Bursts and other transient sources at 182 MHz using the Murchison Widefield Array

    240428_240428.pdf (3.443Mb)
    Access Status
    Open access
    Authors
    Rowlinson, A.
    Bell, M.
    Murphy, T.
    Trott, C.
    Hurley-Walker, N.
    Johnston, S.
    Tingay, Steven
    Kaplan, D.
    Carbone, D.
    Hancock, P.
    Feng, L.
    Offringa, A.
    Bernardi, G.
    Bowman, J.
    Briggs, F.
    Cappallo, R.
    Deshpande, A.
    Gaensler, B.
    Greenhill, L.
    Hazelton, B.
    Johnston-Hollitt, M.
    Lonsdale, C.
    McWhirter, S.
    Mitchell, D.
    Morales, M.
    Morgan, E.
    Oberoi, D.
    Ord, S.
    Prabu, T.
    Udaya Shankar, N.
    Srivani, K.
    Subrahmanyan, R.
    Wayth, Randall
    Webster, R.
    Williams, A.
    Williams, C.
    Date
    2016
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Rowlinson, A. and Bell, M. and Murphy, T. and Trott, C. and Hurley-Walker, N. and Johnston, S. and Tingay, S. et al. 2016. Limits on Fast Radio Bursts and other transient sources at 182 MHz using the Murchison Widefield Array. Monthly Notices of the Royal Astronomical Society. 458 (4): pp. 3506-3522.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1093/mnras/stw451
    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/20.500.11937/3622
    Collection
    • Curtin Research Publications
    Abstract

    We present a survey for transient and variable sources, on time-scales from 28 s to ~1 yr, using the Murchison Widefield Array (MWA) at 182 MHz. Down to a detection threshold of 0.285 Jy, no transient candidates were identified, making this the most constraining low-frequency survey to date and placing a limit on the surface density of transients of <4.1 × 10-7 deg-2 for the shortest time-scale considered. At these frequencies, emission from Fast Radio Bursts (FRBs) is expected to be detectable in the shortest time-scale images without any corrections for interstellar or intergalactic dispersion. At an FRB limiting flux density of 7980 Jy, we find a rate of <82 FRBs per sky per day for dispersion measures <700 pc cm-3. Assuming a cosmological population of standard candles, our rate limits are consistent with the FRB rates obtained by Thornton et al. if they have a flat spectral slope. Finally, we conduct an initial variability survey of sources in the field with flux densities = 0.5 Jy and identify no sources with significant variability in their light curves. However, we note that substantial further work is required to fully characterize both the short-term and low-level variability within this field.

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