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    Parametrizing Epoch of Reionization foregrounds: A deep survey of low-frequency point-source spectra with the Murchison Widefield Array

    240131_240131.pdf (3.986Mb)
    Access Status
    Open access
    Authors
    Offringa, A.
    Trott, C.
    Hurley-Walker, N.
    Johnston-Hollitt, M.
    McKinley, B.
    Barry, N.
    Beardsley, A.
    Bowman, J.
    Briggs, F.
    Carroll, P.
    Dillon, J.
    Ewall-Wice, A.
    Feng, L.
    Gaensler, B.
    Greenhill, L.
    Hazelton, B.
    Hewitt, J.
    Jacobs, D.
    Kim, H.
    Kittiwisit, P.
    Lenc, E.
    Line, J.
    Loeb, A.
    Mitchell, D.
    Morales, M.
    Neben, A.
    Paul, S.
    Pindor, B.
    Pober, J.
    Procopio, P.
    Procopio, J.
    Sethi, S.
    Shankar, N.
    Subrahmanyan, R.
    Sullivan, I.
    Tegmark, M.
    Thyagarajan, N.
    Tingay, Steven
    Wayth, Randall
    Webster, R.
    Wyithe, J.
    Date
    2016
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Offringa, A. and Trott, C. and Hurley-Walker, N. and Johnston-Hollitt, M. and McKinley, B. and Barry, N. and Beardsley, A. et al. 2016. Parametrizing Epoch of Reionization foregrounds: A deep survey of low-frequency point-source spectra with the Murchison Widefield Array. Monthly Notices of the Royal Astronomical Society. 458 (1): pp. 1057-1070.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1093/mnras/stw310
    ISSN
    0035-8711
    School
    Curtin Institute of Radio Astronomy (Physics)
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/DE140100316
    Remarks

    This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society, ©: 2015 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

    URI
    http://hdl.handle.net/20.500.11937/13150
    Collection
    • Curtin Research Publications
    Abstract

    © 2016 The Authors. Experiments that pursue detection of signals from the Epoch of Reionization (EoR) are relying on spectral smoothness of source spectra at low frequencies. This article empirically explores the effect of foreground spectra on EoR experiments by measuring high-resolution full-polarization spectra for the 586 brightest unresolved sources in one of the Murchison Widefield Array (MWA) EoR fields using 45 h of observation. A novel peeling scheme is used to subtract 2500 sources from the visibilities with ionospheric and beam corrections, resulting in the deepest, confusion-limited MWA image so far. The resulting spectra are found to be affected by instrumental effects, which limit the constraints that can be set on source-intrinsic spectral structure. The sensitivity and power-spectrum of the spectra are analysed, and it is found that the spectra of residuals are dominated by point spread function sidelobes from nearby undeconvolved sources. We release a catalogue describing the spectral parameters for each measured source.

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