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    Gridded and direct Epoch of Reionisation bispectrum estimates using the Murchison Widefield Array

    Access Status
    Fulltext not available
    Authors
    Trott, Cathryn
    Watkinson, C.A.
    Jordan, Chris
    Yoshiura, S.
    Majumdar, S.
    Barry, Nichole
    Byrne, R.
    Hazelton, B.J.
    Hasegawa, K.
    Joseph, R.
    Kaneuji, T.
    Kubota, K.
    Li, W.
    Line, Jack
    Lynch, Christene
    McKinley, Ben
    Mitchell, D.A.
    Morales, M.F.
    Murray, Steven
    Pindor, B.
    Pober, J.C.
    Rahimi, M.
    Riding, J.
    Takahashi, K.
    Tingay, Steven
    Wayth, Randall
    Webster, R.L.
    Wilensky, M.
    Wyithe, J.S.B.
    Zheng, Q.
    Emrich, David
    Beardsley, A.P.
    Booler, Tom
    Crosse, B.
    Franzen, Thomas
    Horsley, L.
    Johnston-Hollitt, Melanie
    Kaplan, D.L.
    Kenney, David
    Pallot, D.
    Sleap, G.
    Steele, K.
    Walker, Mia
    Williams, Andrew
    Wu, C.
    Date
    2019
    Type
    Journal Article
    
    Metadata
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    Citation
    Trott, C.M. and Watkinson, C.A. and Jordan, C.H. and Yoshiura, S. and Majumdar, S. and Barry, N. and Byrne, R. et al. 2019. Gridded and direct Epoch of Reionisation bispectrum estimates using the Murchison Widefield Array. Publications of the Astronomical Society of Australia. 36: PII S1323358019000158.
    Source Title
    Publications of the Astronomical Society of Australia
    DOI
    10.1017/pasa.2019.15
    Additional URLs
    https://arxiv.org/abs/1905.07161
    ISSN
    1323-3580
    Faculty
    Faculty of Science and Engineering
    School
    School of Elec Eng, Comp and Math Sci (EECMS)
    Department of Physics and Astronomy
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/CE170100013
    http://purl.org/au-research/grants/arc/FT180100196
    http://purl.org/au-research/grants/arc/LE160100031
    URI
    http://hdl.handle.net/20.500.11937/91578
    Collection
    • Curtin Research Publications
    Abstract

    We apply two methods to estimate the 21-cm bispectrum from data taken within the Epoch of Reionisation (EoR) project of the Murchison Widefield Array (MWA). Using data acquired with the Phase II compact array allows a direct bispectrum estimate to be undertaken on the multiple redundantly spaced triangles of antenna tiles, as well as an estimate based on data gridded to the uv-plane. The direct and gridded bispectrum estimators are applied to 21 h of high-band (167-197 MHz; z = 6.2-7.5) data from the 2016 and 2017 observing seasons. Analytic predictions for the bispectrum bias and variance for point-source foregrounds are derived. We compare the output of these approaches, the foreground contribution to the signal, and future prospects for measuring the bispectra with redundant and non-redundant arrays. We find that some triangle configurations yield bispectrum estimates that are consistent with the expected noise level after 10 h, while equilateral configurations are strongly foreground-dominated. Careful choice of triangle configurations may be made to reduce foreground bias that hinders power spectrum estimators, and the 21-cm bispectrum may be accessible in less time than the 21-cm power spectrum for some wave modes, with detections in hundreds of hours.

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