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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
The giant lobes of centaurus a observed at 118MHz with the murchison widefield array
Monthly Notices of the Royal Astronomical Society, Volume 436, No. 2, Year 2013
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Description
We present new wide-field observations of Centaurus A (Cen A) and the surrounding region at 118MHz with the Murchison Widefield Array (MWA) 32-tile prototype, with which we investigate the spectral-index distribution of Cen A's giant radio lobes.We compare our images to 1.4 GHz maps of Cen A and compute spectral indices using temperature-temperature plots and spectral tomography. We find that the morphologies at 118MHz and 1.4 GHz match very closely apart from an extra peak in the southern lobe at 118 MHz, which provides tentative evidence for the existence of a southern counterpart to the northern middle lobe of Cen A. Our spatially averaged spectral indices for both the northern and southern lobes are consistent with previous analyses, however we find significant spatial variation of the spectra across the extent of each lobe. Both the spectral-index distribution and the morphology at low radio frequencies support a scenario of multiple outbursts of activity from the central engine. Our results are consistent with inverse-Compton modelling of radio and gamma-ray data that support a value for the lobe age of between 10 and 80 Myr. © The Authors.
Authors & Co-Authors
McKinley, Benjamin
Australia, Canberra
The Australian National University
Briggs, Franklin H.
Australia, Canberra
The Australian National University
Gaensler, B. M.
Australia, Canberra
The Australian National University
Australia, Sydney
The University of Sydney
Feain, Ilana J.
Australia, Marsfield
Csiro Astronomy and Space Science
Bernardi, Gianni
United States, Cambridge
Harvard-smithsonian Center for Astrophysics
South Africa, Pinelands
Square Kilometre Array, South Africa
Wayth, Randall B.
Australia, Canberra
The Australian National University
Australia, Perth
Curtin University
Johnston-Hollitt, Melanie
New Zealand, Wellington
Victoria University of Wellington
Offringa, André R.
Australia, Canberra
The Australian National University
Arcus, Wayne R.
Australia, Perth
Curtin University
Barnes, David G.
Australia, Clayton
Monash University
Bowman, Judd D.
United States, Tempe
School of Earth and Space Exploration
Bunton, John D.
Australia, Marsfield
Csiro Astronomy and Space Science
Cappallo, Roger J.
United States, Westford
Mit Haystack Observatory
Corey, Brian E.
United States, Westford
Mit Haystack Observatory
Deshpande, Avinash A.
India, Bengaluru
Raman Research Institute
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, Cambridge
Mit Kavli Institute for Astrophysics and Space Research
Greenhill, Lincoln J.
United States, Cambridge
Harvard-smithsonian Center for Astrophysics
Hazelton, Bryna J.
United States, Seattle
University of Washington
Herne, David E.
Australia, Perth
Curtin University
Hewitt, Jacqueline N.
United States, Cambridge
Mit Kavli Institute for Astrophysics and Space Research
Kaplan, David L.A.
United States, Milwaukee
University of Wisconsin-milwaukee
Kasper, Justin C.
United States, Cambridge
Harvard-smithsonian Center for Astrophysics
Kincaid, Barton B.
United States, Westford
Mit Haystack Observatory
Koenig, Ronald
Australia, Marsfield
Csiro Astronomy and Space Science
Kratzenberg, Eric
United States, Westford
Mit Haystack Observatory
Lonsdale, Colin J.
United States, Westford
Mit Haystack Observatory
Lynch, Mervyn J.
Australia, Perth
Curtin University
McWhirter, Stephen Russell
United States, Westford
Mit Haystack Observatory
Mitchell, Daniel A.
Australia, Canberra
The Australian National University
Australia, Melbourne
School of Physics
Morales, Miguel F.
United States, Seattle
University of Washington
Morgan, Edward H.
United States, Cambridge
Mit Kavli Institute for Astrophysics and Space Research
Oberoi, Divya
India, Pune
National Centre for Radio Astrophysics India
Ord, Stephen M.
Australia, Canberra
The Australian National University
Australia, Perth
Curtin University
Pathikulangara, Joseph
Australia, Marsfield
Csiro Astronomy and Space Science
Prabu, Thiagaraj
India, Bengaluru
Raman Research Institute
Remillard, Ronald A.
United States, Cambridge
Mit Kavli Institute for Astrophysics and Space Research
Rogers, Alan E.E.
United States, Westford
Mit Haystack Observatory
Roshi, D. Anish
United States, Charlottesville
National Radio Astronomy Observatory
Salah, Joseph E.
United States, Westford
Mit Haystack Observatory
Sault, Robert J.
Australia, Melbourne
School of Physics
Udaya-Shankar, N.
India, Bengaluru
Raman Research Institute
Srivani, K. S.
India, Bengaluru
Raman Research Institute
Stevens, Jamie B.
Australia, Marsfield
Csiro Astronomy and Space Science
Australia, Hobart
University of Tasmania
Subrahmanyan, Ravi
Australia, Canberra
The Australian National University
India, Bengaluru
Raman Research Institute
Tingay, Steven John
Australia, Canberra
The Australian National University
Australia, Perth
Curtin University
Waterson, Mark F.
Australia, Canberra
The Australian National University
Australia, Perth
Curtin University
Webster, Rachel L.
Australia, Canberra
The Australian National University
Australia, Melbourne
School of Physics
Whitney, Alan R.
United States, Westford
Mit Haystack Observatory
Williams, Andrew J.
Australia, Perth
Curtin University
Williams, Christopherl L.M.
United States, Cambridge
Mit Kavli Institute for Astrophysics and Space Research
Wyithe, J. S.B.
Australia, Canberra
The Australian National University
Australia, Melbourne
School of Physics
Statistics
Citations: 53
Authors: 53
Affiliations: 18
Identifiers
Doi:
10.1093/mnras/stt1662
ISSN:
00358711
e-ISSN:
13652966