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Title: Low frequency imagingof fields at high galactic latitude with the murchison widefield array 32 element prototype
Authors: Williams, Christopher L.
Hewitt, Jacqueline N
Levine, Alan M.
Oliveira-Costa, Angelica de
Bowman, Judd D.
Briggs, Frank H.
Gaensler, B.M.
Hernquist, Lars L.
Mitchell, D.A.
Morales, M.F.
Sethi, S.K.
Subrahmanyan, Ravi
Roshi, Anish D.
+44 Co-authors
Keywords: dark ages
first stars
data analysis
Issue Date: 10-Aug-2012
Publisher: IOP Publishing Ltd.
Citation: The Astrophysical journal, 2013, Vol.755, p47
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° diameter fields in the southern sky, covering a total of ~2700 deg2, 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 ~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.
Description: Restricted Access. An open-access version is available at (one of the alternative locations)
ISSN: 0004-637X
1538-4357 (Online)
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Copyright: 2012 IOP Publishing Ltd.
Appears in Collections:Research Papers (A&A)

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