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    A pilot survey for transients and variables with the Australian Square Kilometre Array Pathfinder

    272051.pdf (5.487Mb)
    Access Status
    Open access
    Authors
    Bhandari, S.
    Bannister, K.
    Murphy, T.
    Bell, M.
    Raja, W.
    Marvil, J.
    Hancock, Paul
    Whiting, M.
    Flynn, C.
    Collier, J.
    Kaplan, D.
    Allison, J.
    Anderson, C.
    Heywood, I.
    Hotan, A.
    Hunstead, R.
    Lee-Waddell, K.
    Madrid, J.
    McConnell, D.
    Popping, A.
    Rhee, J.
    Sadler, E.
    Voronkov, M.
    Date
    2018
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Bhandari, S. and Bannister, K. and Murphy, T. and Bell, M. and Raja, W. and Marvil, J. and Hancock, P. et al. 2018. A pilot survey for transients and variables with the Australian Square Kilometre Array Pathfinder. Monthly Notices of the Royal Astronomical Society. 478 (2): pp. 1784-1794.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1093/mnras/sty1157
    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 ©: 2018 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

    URI
    http://hdl.handle.net/20.500.11937/72045
    Collection
    • Curtin Research Publications
    Abstract

    We present a pilot search for variable and transient sources at 1.4 GHz with the Australian Square Kilometre Array Pathfinder (ASKAP). The search was performed in a 30 deg2 area centred on the NGC 7232 galaxy group over eight epochs and observed with a near-daily cadence. The search yielded nine potential variable sources, rejecting the null hypothesis that the flux densities of these sources do not change with 99.9 per cent confidence. These nine sources displayed flux density variations with modulation indices m = 0.1 above our flux density limit of ~1.5mJy. They are identified to be compact active galactic nucleus (AGN)/quasars or galaxies hosting an AGN, whose variability is consistent with refractive interstellar scintillation.We also detect a highly variable source with modulation index m > 0.5 over a time interval of a decade between the SydneyUniversity Molonglo Sky Survey (SUMSS) and our latest ASKAP observations. We find the source to be consistent with the properties of long-term variability of a quasar. No transients were detected on time-scales of days and we place an upper limit ?t < 0.01 deg-2 with 95 per cent confidence for non-detections on near-daily time-scales. The future VAST-Wide survey with 36-ASKAP dishes will probe the transient phase space with similar cadence to our pilot survey, but better sensitivity, and will detect and monitor rarer brighter events.

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