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Title:
The Murchison Widefield Array Commissioning Survey: A Low-Frequency Catalogue of 14 110 Compact Radio Sources over 6 100 Square Degrees
Authors:
Hurley-Walker, Natasha; Morgan, John; Wayth, Randall B.; Hancock, Paul J.; Bell, Martin E.; Bernardi, Gianni; Bhat, Ramesh; Briggs, Frank; Deshpande, Avinash A.; Ewall-Wice, Aaron; Feng, Lu; Hazelton, Bryna J.; Hindson, Luke; Jacobs, Daniel C.; Kaplan, David L.; Kudryavtseva, Nadia; Lenc, Emil; McKinley, Benjamin; Mitchell, Daniel; Pindor, Bart; Procopio, Pietro; Oberoi, Divya; Offringa, André; Ord, Stephen; Riding, Jennifer; Bowman, Judd D.; Cappallo, Roger; Corey, Brian; Emrich, David; Gaensler, B. M.; Goeke, Robert; Greenhill, Lincoln; Hewitt, Jacqueline; Johnston-Hollitt, Melanie; Kasper, Justin; Kratzenberg, Eric; Lonsdale, Colin; Lynch, Mervyn; McWhirter, Russell; Morales, Miguel F.; Morgan, Edward; Prabu, Thiagaraj; Rogers, Alan; Roshi, Anish; Shankar, Udaya; Srivani, K.; Subrahmanyan, Ravi; Tingay, Steven; Waterson, Mark; Webster, Rachel; Whitney, Alan; Williams, Andrew; Williams, Chris
Affiliation:
AA(International Centre for Radio Astronomy Research (ICRAR), Curtin University, Perth, Australia), AB(International Centre for Radio Astronomy Research (ICRAR), Curtin University, Perth, Australia), AC(International Centre for Radio Astronomy Research (ICRAR), Curtin University, Perth, Australia; ARC Centre of Excellence for All-sky Astrophysics (CAASTRO), Redfern, NSW, Australia), AD(International Centre for Radio Astronomy Research (ICRAR), Curtin University, Perth, Australia), AE(ARC Centre of Excellence for All-sky Astrophysics (CAASTRO), Redfern, NSW, Australia; Sydney Institute for Astronomy (SIfA), School of Physics, The University of Sydney, Sydney, NSW 2006, Australia), AF(SKA SA, 3rd Floor, The Park, Park Road, Pinelands, 7405, South Africa; Department of Physics and Electronics, Rhodes University, PO Box 94, Grahamstown, 6140, South Africa; Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, 02138, USA), AG(International Centre for Radio Astronomy Research (ICRAR), Curtin University, Perth, Australia), AH(ARC Centre of Excellence for All-sky Astrophysics (CAASTRO), Redfern, NSW, Australia; Research School of Astronomy & Astrophysics, Mount Stromlo Observatory, Australian National University, Weston Creek ACT 2611, Australia), AI(Raman Research Institute, Bangalore, India), AJ(MIT Kavli Institute for Astrophysics and Space Research, Cambridge, MA, USA), AK(MIT Kavli Institute for Astrophysics and Space Research, Cambridge, MA, USA), AL(Physics Department, University of Washington, Seattle, WA, USA), AM(School of Chemical and Physical Sciences, Victoria University of Wellington, Wellington, New Zealand), AN(School of Earth and Space Exploration, Arizona State University, Tempe, AZ, USA), AO(Physics Department, University of Wisconsin-Milwaukee, Milwaukee, WI, USA), AP(International Centre for Radio Astronomy Research (ICRAR), Curtin University, Perth, Australia), AQ(ARC Centre of Excellence for All-sky Astrophysics (CAASTRO), Redfern, NSW, Australia; Sydney Institute for Astronomy (SIfA), School of Physics, The University of Sydney, Sydney, NSW 2006, Australia), AR(ARC Centre of Excellence for All-sky Astrophysics (CAASTRO), Redfern, NSW, Australia; Research School of Astronomy & Astrophysics, Mount Stromlo Observatory, Australian National University, Weston Creek ACT 2611, Australia), AS(CSIRO Astronomy and Space Science (CASS), PO Box 76, Epping, NSW 1710, Australia), AT(ARC Centre of Excellence for All-sky Astrophysics (CAASTRO), Redfern, NSW, Australia; School of Physics, The University of Melbourne, Melbourne, Australia), AU(ARC Centre of Excellence for All-sky Astrophysics (CAASTRO), Redfern, NSW, Australia; School of Physics, The University of Melbourne, Melbourne, Australia), AV(National Centre for Radio Astrophysics, Pune, India), AW(ARC Centre of Excellence for All-sky Astrophysics (CAASTRO), Redfern, NSW, Australia; Research School of Astronomy & Astrophysics, Mount Stromlo Observatory, Australian National University, Weston Creek ACT 2611, Australia), AX(International Centre for Radio Astronomy Research (ICRAR), Curtin University, Perth, Australia; ARC Centre of Excellence for All-sky Astrophysics (CAASTRO), Redfern, NSW, Australia), AY(ARC Centre of Excellence for All-sky Astrophysics (CAASTRO), Redfern, NSW, Australia; School of Physics, The University of Melbourne, Melbourne, Australia), AZ(School of Earth and Space Exploration, Arizona State University, Tempe, AZ, USA), BA(MIT Haystack Observatory, Westford, MA, USA), BB(MIT Haystack Observatory, Westford, MA, USA), BC(International Centre for Radio Astronomy Research (ICRAR), Curtin University, Perth, Australia), BD(ARC Centre of Excellence for All-sky Astrophysics (CAASTRO), Redfern, NSW, Australia; Sydney Institute for Astronomy (SIfA), School of Physics, The University of Sydney, Sydney, NSW 2006, Australia), BE(MIT Haystack Observatory, Westford, MA, USA), BF(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, 02138, USA), BG(MIT Kavli Institute for Astrophysics and Space Research, Cambridge, MA, USA), BH(School of Chemical and Physical Sciences, Victoria University of Wellington, Wellington, New Zealand), BI(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, 02138, USA), BJ(MIT Haystack Observatory, Westford, MA, USA), BK(MIT Haystack Observatory, Westford, MA, USA), BL(International Centre for Radio Astronomy Research (ICRAR), Curtin University, Perth, Australia), BM(MIT Haystack Observatory, Westford, MA, USA), BN(Physics Department, University of Washington, Seattle, WA, USA), BO(MIT Kavli Institute for Astrophysics and Space Research, Cambridge, MA, USA), BP(Raman Research Institute, Bangalore, India), BQ(MIT Haystack Observatory, Westford, MA, USA), BR(National Radio Astronomy Observatory, Charlottesville, WV, USA), BS(Raman Research Institute, Bangalore, India), BT(Raman Research Institute, Bangalore, India), BU(ARC Centre of Excellence for All-sky Astrophysics (CAASTRO), Redfern, NSW, Australia; Raman Research Institute, Bangalore, India), BV(International Centre for Radio Astronomy Research (ICRAR), Curtin University, Perth, Australia; ARC Centre of Excellence for All-sky Astrophysics (CAASTRO), Redfern, NSW, Australia), BW(International Centre for Radio Astronomy Research (ICRAR), Curtin University, Perth, Australia; Research School of Astronomy & Astrophysics, Mount Stromlo Observatory, Australian National University, Weston Creek ACT 2611, Australia), BX(ARC Centre of Excellence for All-sky Astrophysics (CAASTRO), Redfern, NSW, Australia; School of Physics, The University of Melbourne, Melbourne, Australia), BY(MIT Haystack Observatory, Westford, MA, USA), BZ(International Centre for Radio Astronomy Research (ICRAR), Curtin University, Perth, Australia), CA(MIT Kavli Institute for Astrophysics and Space Research, Cambridge, MA, USA)
Publication:
Publications of the Astronomical Society of Australia, Volume 31, id.e045 20 pp. (PASA Homepage)
Publication Date:
11/2014
Origin:
AUTHOR; CUP
Astronomy Keywords:
radio continuum: general, surveys, techniques: interferometric
Abstract Copyright:
2014: Astronomical Society of Australia
DOI:
10.1017/pasa.2014.40
Bibliographic Code:
2014PASA...31...45H

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: the 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 < RA < 8.5 h, - 58° < Dec < -14°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- 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.

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