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The Murchison Widefield Array (MWA) is a new low-frequency, widefield-of-view radio interferometer under development at the MurchisonRadio-astronomy Observatory (MRO) in Western Australia. We have used a32-element MWA prototype interferometer (MWA-32T) to observe two 50-degreediameter fields in the southern sky in the 110 MHz to 200 MHz band in order toevaluate the performance of the MWA-32T, to develop techniques for epoch ofreionization experiments, and to make measurements of astronomical foregrounds.We developed a calibration and imaging pipeline for the MWA-32T, and used it toproduce ~15' angular resolution maps of the two fields. We perform a blindsource extraction using these confusion-limited images, and detect 655 sourcesat high significance with an additional 871 lower significance sourcecandidates. We compare these sources with existing low-frequency radio surveysin order to assess the MWA-32T system performance, wide field analysisalgorithms, and catalog quality. Our source catalog is found to agree well withexisting low-frequency surveys in these regions of the sky and with statisticaldistributions of point sources derived from Northern Hemisphere surveys; itrepresents one of the deepest surveys to date of this sky field in the 110 MHzto 200 MHz band.

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