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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
A survey for transients and variables with the murchison widefield array 32-tile prototype at 154 MHz
Monthly Notices of the Royal Astronomical Society, Volume 438, No. 1, Year 2014
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Description
We present a search for transient and variable radio sources at 154 MHz with the Murchison Widefield Array 32-tile prototype. 51 images were obtained that cover a field of view of 1430 deg2 centred on Hydra A. The observations were obtained over three days in 2010 March and three days in 2011 April and May. The mean cadence of the observations was 26 min and there was additional temporal information on day and year time-scales. We explore the variability of a sample of 105 low-frequency radio sources within the field. Four bright (S > 6 Jy) candidate variable radio sources were identified that displayed low levels of short time-scale variability (26 min). We conclude that this variability is likely caused by simplifications in the calibration strategy or ionospheric effects. On the time-scale of 1 yr we find two sources that show significant variability. We attribute this variability to either refractive scintillation or intrinsic variability. No radio transients were identified and we place an upper limit on the surface density of sources ρ < 7.5 × 10-5 deg-2 with flux densities >5.5 Jy, and characteristic time-scales of both 26 min and 1 yr. © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.
Authors & Co-Authors
Bell, Martin E.
Australia, Sydney
The University of Sydney
Murphy, Tara
Australia, Sydney
The University of Sydney
Kaplan, David L.A.
United States, Milwaukee
University of Wisconsin-milwaukee
Hancock, Paul J.
Australia, Sydney
The University of Sydney
Gaensler, B. M.
Australia, Sydney
The University of Sydney
Banyer, Jay
Australia, Sydney
The University of Sydney
Bannister, Keith W.
Australia, Sydney
The University of Sydney
Australia, Marsfield
Csiro Astronomy and Space Science
Trott, Cathryn M.
Australia, Sydney
The University of Sydney
Australia, Perth
Curtin University
Hurley-Walker, Natasha
Australia, Perth
Curtin University
Wayth, Randall B.
Australia, Sydney
The University of Sydney
Australia, Perth
Curtin University
MacQuart, Jean Pierre R.
Australia, Sydney
The University of Sydney
Australia, Perth
Curtin University
Arcus, Wayne R.
Australia, Perth
Curtin University
Barnes, David G.
Australia, Clayton
Monash University
Bernardi, Gianni
South Africa, Grahamstown
Rhodes University
South Africa, Pinelands
Square Kilometre Array, South Africa
Bowman, Judd D.
United States, Cambridge
Mit Kavli Institute for Astrophysics and Space Research
Briggs, Franklin H.
Australia, Sydney
The University of Sydney
United States, Cambridge
Harvard-smithsonian Center for Astrophysics
Bunton, John D.
Australia, Marsfield
Csiro Astronomy and Space Science
Cappallo, Roger J.
United States, Tempe
School of Earth and Space Exploration
Corey, Brian E.
United States, Tempe
School of Earth and Space Exploration
Deshpande, Avinash A.
Australia, Canberra
The Australian National University
DeSouza, Ludi
Australia, Sydney
The University of Sydney
Australia, Marsfield
Csiro Astronomy and Space Science
Emrich, David
Australia, Perth
Curtin University
Goeke, Robert F.
United States, Westford
Mit Haystack Observatory
Greenhill, Lincoln J.
India, Bengaluru
Raman Research Institute
Hazelton, Bryna J.
United States, Seattle
University of Washington
Herne, David E.
Australia, Perth
Curtin University
Hewitt, Jacqueline N.
United States, Westford
Mit Haystack Observatory
Johnston-Hollitt, Melanie
New Zealand, Wellington
Victoria University of Wellington
Kasper, Justin C.
India, Bengaluru
Raman Research Institute
Kincaid, Barton B.
United States, Tempe
School of Earth and Space Exploration
Koenig, Ronald
Australia, Marsfield
Csiro Astronomy and Space Science
Kratzenberg, Eric
United States, Tempe
School of Earth and Space Exploration
Lonsdale, Colin J.
United States, Tempe
School of Earth and Space Exploration
Lynch, Mervyn J.
Australia, Perth
Curtin University
McWhirter, Stephen Russell
United States, Tempe
School of Earth and Space Exploration
Mitchell, Daniel A.
Australia, Sydney
The University of Sydney
Australia, Melbourne
School of Physics
Morales, Miguel F.
United States, Seattle
University of Washington
Morgan, Edward H.
United States, Westford
Mit Haystack Observatory
Oberoi, Divya
India, Pune
National Centre for Radio Astrophysics India
Ord, Stephen M.
Australia, Sydney
The University of Sydney
Australia, Perth
Curtin University
Pathikulangara, Joseph
Australia, Marsfield
Csiro Astronomy and Space Science
Prabu, Thiagaraj
Australia, Canberra
The Australian National University
Remillard, Ronald A.
United States, Westford
Mit Haystack Observatory
Rogers, Alan E.E.
United States, Tempe
School of Earth and Space Exploration
Roshi, Anish A.
Australia, Canberra
The Australian National University
Salah, Joseph E.
United States, Tempe
School of Earth and Space Exploration
Sault, Robert J.
Australia, Melbourne
School of Physics
Udaya-Shankar, N.
Australia, Canberra
The Australian National University
Srivani, K. S.
Australia, Canberra
The Australian National University
Stevens, Jamie B.
Australia, Marsfield
Csiro Astronomy and Space Science
Australia, Hobart
University of Tasmania
Subrahmanyan, Ravi
Australia, Sydney
The University of Sydney
Australia, Canberra
The Australian National University
Tingay, Steven John
Australia, Sydney
The University of Sydney
Australia, Perth
Curtin University
Waterson, Mark F.
Australia, Perth
Curtin University
United States, Cambridge
Harvard-smithsonian Center for Astrophysics
Webster, Rachel L.
Australia, Sydney
The University of Sydney
Australia, Melbourne
School of Physics
Whitney, Alan R.
United States, Tempe
School of Earth and Space Exploration
Williams, Andrew J.
Australia, Perth
Curtin University
Williams, Christopherl L.M.
United States, Westford
Mit Haystack Observatory
Wyithe, J. S.B.
Australia, Sydney
The University of Sydney
Australia, Melbourne
School of Physics
Statistics
Citations: 58
Authors: 58
Affiliations: 18
Identifiers
Doi:
10.1093/mnras/stt2200
ISSN:
00358711
e-ISSN:
13652966
Study Design
Cross Sectional Study
Study Approach
Quantitative