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The Murchison Widefield Array Commissioning Survey: A Low-Frequency Catalogue of 14 110 Compact Radio Sources over 6 100 Square Degrees

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Authors
Hurley-Walker, Natasha
Morgan, John
Wayth, Randall
Hancock, Paul
Bell, M.
BERNARDI, G.
Bhat, Ramesh
Briggs, F.
Deshpande, A.
Ewall-Wice, A.
Feng, L.
Hazelton, B.
Hindson, L.
Jacobs, D.
KAPLAN, D.
Kudryavtseva, Nadia
Lenc, E.
McKinley, B.
Mitchell, D.
Pindor, B.
Procopio, P.
Oberoi, D.
Offringa, A.
Ord, Stephen
Riding, J.
Bowman, J.
Cappallo, R.
Corey, B.
Emrich, David
Gaensler, B.
Goeke, R.
Greenhill, L.
Hewitt, J.
Johnston-Hollitt, M.
Kasper, J.
Kratzenberg, E.
Lonsdale, C.
Lynch, Mervyn
McWhirter, R.
Morales, M.
Morgan, E.
Prabu, T.
Rogers, A.
Roshi, A.
Shankar, U.
Srivani, K.
Subrahmanyan, R.
Tingay, Steven
Waterson, Mark
Webster, R.
Whitney, A.
Williams, Andrew
Williams, C.
Date
2014
Type
Journal Article

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Citation
Hurley-Walker, N. and Morgan, J. and Wayth, R. and Hancock, P. and Bell, M. and BERNARDI, G. and Bhat, R. et al. 2014. The Murchison Widefield Array Commissioning Survey: A Low-Frequency Catalogue of 14 110 Compact Radio Sources over 6 100 Square Degrees. Publications of the Astronomical Society of Australia. 31.
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Publications of the Astronomical Society of Australia
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Curtin Institute of Radio Astronomy (Physics)
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Abstract

We present the results of an approximately 6 100 deg2 104–196 MHz radio sky survey performed with the Murchison Widefield Array during instrument commissioning between 2012 September and 2012 December: theMWACS. The data were taken as meridian drift scans with two different 32-antenna sub-arrays that were available during the commissioning period. The survey covers approximately 20.5 h< RA < 8.5 h, −58◦ < Dec < −14◦over three frequency bands centredon 119, 150 and 180 MHz, with image resolutions of 6–3 arcmin. The catalogue has 3 arcmin angular resolution and a typical noise level of 40 mJy beam−1, with reduced sensitivity near the field boundaries and bright sources. We describe the data reduction strategy, based upon mosaicked snapshots, flux density calibration, and source-finding method. We present a catalogue of flux density and spectral index measurements for 14 110 sources, extracted from the mosaic, 1 247 of which are sub-components of complexes of sources.