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    Robust statistics towards detection of the 21 cm signal from the Epoch of Reionization

    80271.pdf (11.17Mb)
    Access Status
    Open access
    Authors
    Trott, Cathryn
    Fu, Shih Ching
    Murray, Steven
    Jordan, Chris
    Line, Jack
    Barry, N.
    Byrne, R.
    Hazelton, B.J.
    Hasegawa, K.
    Joseph, R.
    Kaneuji, T.
    Kubota, K.
    Li, W.
    Lynch, Christene
    McKinley, Ben
    Mitchell, D.A.
    Morales, M.F.
    Pindor, B.
    Pober, J.C.
    Rahimi, M.
    Takahashi, K.
    Tingay, Steven
    Wayth, Randall
    Webster, R.L.
    Wilensky, M.
    Wyithe, J.S.B.
    Yoshiura, S.
    Zheng, Q.
    Walker, Mia
    Date
    2019
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Trott, C.M. and Fu, S.C. and Murray, S.G. and Jordan, C.H. and Line, J.L.B. and Barry, N. and Byrne, R. et al. 2019. Robust statistics towards detection of the 21 cm signal from the Epoch of Reionization. Monthly Notices of the Royal Astronomical Society. 486 (4): pp. 5766-5784.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1093/mnras/stz1207
    ISSN
    0035-8711
    Faculty
    Faculty of Science and Engineering
    School
    School of Elec Eng, Comp and Math Sci (EECMS)
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/CE170100013
    http://purl.org/au-research/grants/arc/LE160100031
    Remarks

    This is a pre-copyedited, author-produced version of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record Trott, C.M. and Fu, S.C. and Murray, S.G. and Jordan, C.H. and Line, J.L.B. and Barry, N. and Byrne, R. et al. 2019. Robust statistics towards detection of the 21 cm signal from the Epoch of Reionization. Monthly Notices of the Royal Astronomical Society. 486 (4): pp. 5766-5784, is available online at: https://doi.org/10.1093/mnras/stz1207.

    URI
    http://hdl.handle.net/20.500.11937/80189
    Collection
    • Curtin Research Publications
    Abstract

    © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. We explore methods for robust estimation of the 21 cm signal from the Epoch of Reionization (EoR). A Kernel Density Estimator (KDE) is introduced for measuring the spatial temperature fluctuation power spectrum from the EoR. The KDE estimates the underlying probability distribution function of fluctuations as a function of spatial scale, and contains different systematic biases and errors to the typical approach to estimating the fluctuation power spectrum. Extraction of histograms of visibilities allows moments analysis to be used to discriminate foregrounds from 21 cm signal and thermal noise. We use the information available in the histograms, along with the statistical dis-similarity of foregrounds from two independent observing fields, to robustly separate foregrounds from cosmological signal, while making no assumptions about the Gaussianity of the signal. Using two independent observing fields to robustly discriminate signal from foregrounds is crucial for the analysis presented in this paper. We apply the techniques to 13 h of Murchison Widefield Array EoR data over two observing fields. We compare the output to that obtained with a comparative power spectrum estimation method, and demonstrate the reduced foreground contamination using this approach. Using the second moment obtained directly from the KDE distribution functions yields a factor of 2-3 improvement in power for k < 0.3 h Mpc-1 compared with a matched delay space power estimator, while weighting data by additional statistics does not offer significant improvement beyond that available for thermal noise-only weights.

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