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28 March 2024
 
  » arxiv » 1410.0790

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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
Natasha Hurley-Walker ; John Morgan ; Randall B. Wayth ; Paul J. Hancock ; Martin E. Bell ; Gianni Bernardi ; Ramesh Bhat ; Frank Briggs ; Avinash A. Deshpande ; Aaron Ewall-Wice ; Lu Feng ; Bryna J. Hazelton ; Luke Hindson ; Daniel C. Jacobs ; David L. Kaplan Nadia Kudryavtseva ; Emil Lenc ; Benjamin McKinley ; Daniel Mitchell ; Bart Pindor ; Pietro Procopio ; Divya Oberoi ; André Offringa ; Stephen Ord ; Jennifer Riding ; Judd D. Bowman ; Roger Cappallo ; Brian Corey ; David Emrich ; B. M. Gaensler ; Robert Goeke ; Lincoln Greenhill ; Jacqueline Hewitt ; Melanie Johnston-Hollitt ; Justin Kasper ; Eric Kratzenberg ; Colin Lonsdale ; Mervyn Lynch ; Russell McWhirter ; Miguel F. Morales ; Edward Morgan ; Thiagaraj Prabu ; Alan Rogers ; Anish Roshi ; Udaya Shankar ; K. Srivani ; Ravi Subrahmanyan ; Steven Tingay ; Mark Waterson ; Rachel Webster ; Alan Whitney ; Andrew Williams ; Chris Williams ;
Date 3 Oct 2014
AbstractWe present the results of an approximately 6,100 square degree 104--196MHz radio sky survey performed with the Murchison Widefield Array during instrument commissioning between 2012 September and 2012 December: the Murchison Widefield Array Commissioning Survey (MWACS). 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 < Right Ascension (RA) < 8.5 h, -58 deg < Declination (Dec) < -14 deg over three frequency bands centred on 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, with reduced sensitivity near the field boundaries and bright sources. We describe the data reduction strategy, based upon mosaiced 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.
Source arXiv, 1410.0790
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