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

Citation

Williams, CL and Hewitt, JN and Levine, AM and de Oliveira-Costa, A and Bowman, JD and Briggs, FH and Gaensler, BM and Hernquist, LL and Mitchell, DA and Morales, MF and Sethi, SK and Subrahmanyan, R and Sadler, EM and Arcus, W and Barnes, DG and Bernardi, G and Bunton, JD and Cappallo, RC and Crosse, BW and Corey, BE and Deshpande, A and deSouza, L and Emrich, D and Goeke, RF and Greenhill, LJ and Hazelton, BJ and Herne, D and Kaplan, DL and Kasper, JC and Kincaid, BB and Koenig, R and Kratzenberg, E and Lonsdale, CJ and Lynch, MJ and McWhirter, SR and Morgan, EH and Oberoi, D and Ord, SM and Pathikulangara, J and Prabu, T and Remillard, RA and Rogers, AEE and Roshi, DA and Salah, JE and Sault, RJ and Shankar, NU and Srivani, KS and Stevens, JB and Tingay, SJ and Wayth, RB and Waterson, M and Webster, RL and Whitney, AR and Williams, AJ and Wyithe, JSB, Low-Frequency Imaging of Fields at High Galactic Latitude with the Murchison Widefield Array 32 Element Prototype, The Astrophysical Journal, 755, (1) Article 47. ISSN 0004-637X (2012) [Refereed Article]

Copyright Statement

Copyright 2012 The American Astronomical Society

DOI: doi:10.1088/0004-637X/755/1/47

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.

Item Details

Item Type:Refereed Article
Keywords:dark ages, reionization, first stars; instrumentation: interferometers; methods: data analysis; surveys
Research Division:Physical Sciences
Research Group:Astronomical and Space Sciences
Research Field:Galactic Astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Physical Sciences
Author:Stevens, JB (Dr Jamie Stevens)
ID Code:83100
Year Published:2012
Web of Science® Times Cited:23
Deposited By:Mathematics and Physics
Deposited On:2013-03-01
Last Modified:2013-07-05
Downloads:0

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