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    BIGHORNS - Broadband Instrument for Global HydrOgen ReioNisation Signal

    Access Status
    Open access via publisher
    Authors
    Sokolowski, M.
    Tremblay, S.
    Wayth, Randall
    Tingay, Steven
    Clarke, N.
    Roberts, P.
    Waterson, M.
    Ekers, R.
    Hall, Peter
    Lewis, M.
    Mossammaparast, M.
    Padhi, S.
    Schlagenhaufer, F.
    Sutinjo, Adrian
    Tickner, J.
    Date
    2015
    Type
    Journal Article
    
    Metadata
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    Citation
    Sokolowski, M. and Tremblay, S. and Wayth, R. and Tingay, S. and Clarke, N. and Roberts, P. and Waterson, M. et al. 2015. BIGHORNS - Broadband Instrument for Global HydrOgen ReioNisation Signal. Publications of the Astronomical Society of Australia. 32: Article ID e004.
    Source Title
    Publications of the Astronomical Society of Australia
    DOI
    10.1017/pasa.2015.3
    ISSN
    1323-3580
    School
    Department of Electrical and Computer Engineering
    URI
    http://hdl.handle.net/20.500.11937/32053
    Collection
    • Curtin Research Publications
    Abstract

    The redshifted 21cm line of neutral hydrogen (Hi), potentially observable at low radio frequencies (~50-200 MHz), should be a powerful probe of the physical conditions of the inter-galactic medium during Cosmic Dawn and the Epoch of Reionisation (EoR). The sky-averaged Hi signal is expected to be extremely weak (~100 mK) in comparison to the foreground of up to 104 K at the lowest frequencies of interest. The detection of such a weak signal requires an extremely stable, well characterised system and a good understanding of the foregrounds. Development of a nearly perfectly (~mK accuracy) calibrated total power radiometer system is essential for this type of experiment. We present the BIGHORNS (Broadband Instrument for Global HydrOgen ReioNisation Signal) experiment which was designed and built to detect the sky-averaged Hi signal from the EoR at low radio frequencies. The BIGHORNS system is a mobile total power radiometer, which can be deployed in any remote location in order to collect radio frequency interference (RFI) free data. The system was deployed in remote, radio quiet locations in Western Australia and low RFI sky data have been collected. We present a description of the system, its characteristics, details of data analysis, and calibration. We have identified multiple challenges to achieving the required measurement precision, which triggered two major improvements for the future system.

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