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    GLEAM: The GaLactic and Extragalactic All-Sky MWA Survey

    Access Status
    Open access via publisher
    Authors
    Wayth, Randall
    Lenc, E.
    Bell, M.
    Callingham, J.
    Dwarakanath, K.
    Franzen, T.
    For, B.
    Gaensler, B.
    Hancock, P.
    Hindson, L.
    Hurley-Walker, N.
    Jackson, C.
    Johnston-Hollitt, M.
    Kapinska, A.
    McKinley, B.
    Morgan, J.
    Offringa, A.
    Procopio, P.
    Staveley-Smith, L.
    Wu, C.
    Zheng, Q.
    Trott, C.
    Bernardi, G.
    Bowman, J.
    Briggs, F.
    Cappallo, R.
    Corey, B.
    Deshpande, A.
    Emrich, D.
    Goeke, R.
    Greenhill, L.
    Hazelton, B.
    Kaplan, D.
    Kasper, J.
    Kratzenberg, E.
    Lonsdale, C.
    Lynch, Mervyn
    McWhirter, S.
    Mitchell, D.
    Morales, M.
    Morgan, E.
    Oberoi, D.
    Ord, S.
    Prabu, T.
    Rogers, A.
    Roshi, A.
    Shankar, N.
    Srivani, K.
    Subrahmanyan, R.
    Tingay, Steven
    Waterson, M.
    Webster, R.
    Whitney, A.
    Williams, A.
    Williams, C.
    Date
    2015
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Wayth, R. and Lenc, E. and Bell, M. and Callingham, J. and Dwarakanath, K. and Franzen, T. and For, B. et al. 2015. GLEAM: The GaLactic and Extragalactic All-Sky MWA Survey. Publications of the Astronomical Society of Australia. 32: Article ID e025.
    Source Title
    Publications of the Astronomical Society of Australia
    DOI
    10.1017/pasa.2015.26
    ISSN
    1323-3580
    School
    Department of Electrical and Computer Engineering
    URI
    http://hdl.handle.net/20.500.11937/43657
    Collection
    • Curtin Research Publications
    Abstract

    GLEAM, the GaLactic and Extragalactic All-sky MWA survey, is a survey of the entire radio sky south of declination + 25° at frequencies between 72 and 231 MHz, made with the MWA using a drift scan method that makes efficient use of the MWA’s very large field-of-view. We present the observation details, imaging strategies, and theoretical sensitivity for GLEAM. The survey ran for two years, the first year using 40-kHz frequency resolution and 0.5-s time resolution; the second year using 10-kHz frequency resolution and 2 s time resolution. The resulting image resolution and sensitivity depends on observing frequency, sky pointing, and image weighting scheme. At 154 MHz, the image resolution is approximately 2.5 × 2.2/cos (δ + 26.7°) arcmin with sensitivity to structures up to ~ 10° in angular size. We provide tables to calculate the expected thermal noise for GLEAM mosaics depending on pointing and frequency and discuss limitations to achieving theoretical noise in Stokes I images. We discuss challenges, and their solutions, that arise for GLEAM including ionospheric effects on source positions and linearly polarised emission, and the instrumental polarisation effects inherent to the MWA’s primary beam.

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