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    Low-Frequency Imaging of Fields at High Galactic Latitude with the Murchison Widefield Array 32 Element Prototype

    189884_73075_71825_____0004-637X_755_1_47.pdf (1.980Mb)
    Access Status
    Open access
    Authors
    Williams, C.
    Hewitt, J.
    Levine, A.
    de Oliveira-Costa, A.
    Bowman, Judd
    Briggs, Frank
    Gaensler, B.
    Hernquist, Lars
    Mitchell, D.
    Morales, Miguel
    Sethi, S.
    Subrahmanyan, R.
    Sadler, E.
    Arcus, Wayne
    Barnes, David
    Bernardi, G.
    Bunton, John
    Cappallo, Roger
    Crosse, B.
    Corey, Brian.
    Deshpande, Avinash
    DeSouza, Ludi
    Emrich, D.
    Goeke, Robert
    Greenhill, L.
    Hazelton, Bryna
    Herne, David
    Kaplan, D.
    Kasper, Justin
    Kincaid, Barton
    Koenig, R.
    Kratzenberg, Eric
    Lonsdale, Colin
    Lynch, Mervyn
    McWhirter, S.
    Morgan, Edward
    Oberoi, Divya
    Ord, Stephen
    Pathikulangara, Joseph
    Prabu, T.
    Remillard, Ron
    Rogers, Alan
    Roshi, Anish
    Salah, J.
    Sault, R.
    Shankar, N Udaya
    Srivani, K.
    Stevens, J.
    Tingay, Steven
    Wayth, Randall
    Waterson, Mark
    Webster, Rachel
    Whitney, Alan
    Williams, A.
    Wyithe, J.
    Date
    2012
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Williams, C and Hewitt, Jacqueline and Levine, A and de Oliveira-Costa, A and Bowman, Judd and Briggs, Frank and Gaensler, B. et al. 2012. Low-Frequency Imaging of Fields at High Galactic Latitude with the Murchison Widefield Array 32 Element Prototype. The Astrophysical Journal 755 (1): 47.
    Source Title
    The Astrophysical Journal
    DOI
    10.1088/0004-637X/755/1/47
    ISSN
    0004637X
    URI
    http://hdl.handle.net/20.500.11937/30696
    Collection
    • Curtin Research Publications
    Abstract

    The Murchison Widefield Array (MWA) is a new low-frequency, wide-field-of-view radio interferometer under development at the Murchison Radio-astronomy Observatory in Western Australia. We have used a 32 element MWA prototype interferometer (MWA-32T) to observe two 50 degrees diameter fields in the southern sky, covering a total of similar to 2700 deg(2), in order to evaluate the performance of the MWA-32T, to develop techniques for epoch of reionization experiments, and to make measurements of astronomical foregrounds. We developed a calibration and imaging pipeline for the MWA-32T, and used it to produce similar to 15' angular resolution maps of the two fields in the 110-200 MHz band. We perform a blind source extraction using these confusion-limited images, and detect 655 sources at high significance with an additional 871 lower significance source candidates. We compare these sources with existing low-frequency radio surveys in order to assess the MWA-32T system performance, wide-field analysis algorithms, and catalog quality. Our source catalog is found to agree well with existing low-frequency surveys in these regions of the sky and with statistical distributions of point sources derived from Northern Hemisphere surveys; it represents one of the deepest surveys to date of this sky field in the 110-200 MHz band.

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