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    DIRECTION-DEPENDENT POLARIZED PRIMARY BEAMS IN WIDE-FIELD SYNTHESIS IMAGING

    Access Status
    Fulltext not available
    Authors
    Mitchell, D.
    Wayth, Randall
    Bernardi, G.
    Greenhill, L.
    Ord, S.
    Date
    2012
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Mitchell, D. and Wayth, R. and Bernardi, G. and Greenhill, L. and Ord, S. 2012. DIRECTION-DEPENDENT POLARIZED PRIMARY BEAMS IN WIDE-FIELD SYNTHESIS IMAGING. JOURNAL OF ASTRONOMICAL INSTRUMENTATION. 1 (1).
    Source Title
    JOURNAL OF ASTRONOMICAL INSTRUMENTATION
    DOI
    10.1142/S2251171712500031
    ISSN
    2251-1717
    School
    Department of Electrical and Computer Engineering
    URI
    http://hdl.handle.net/20.500.11937/58558
    Collection
    • Curtin Research Publications
    Abstract

    The process of wide-field synthesis imaging is explored, with the aim of understanding the implications of variable, polarised primary beams for forthcoming Epoch of Reionisation experiments. These experiments seek to detect weak signatures from redshifted 21cm emission in deep residual datasets, after suppression and subtraction of foreground emission. Many subtraction algorithms benefit from low side-lobes and polarisation leakage at the outset, and both of these are intimately linked to how the polarised primary beams are handled. Building on previous contributions from a number of authors, in which direction-dependent corrections are incorporated into visibility gridding kernels, we consider the special characteristics of arrays of fixed dipole antennas operating around 100-200 MHz, looking towards instruments such as the Square Kilometre Array (SKA) and the Hydrogen Epoch of Reionization Arrays (HERA). We show that integrating snapshots in the image domain can help to produce compact gridding kernels, and also reduce the need to make complicated polarised leakage corrections during gridding. We also investigate an alternative form for the gridding kernel that can suppress variations in the direction-dependent weighting of gridded visibilities by 10s of dB, while maintaining compact support.

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