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    The giant lobes of Centaurus A observed at 118MHz with the Murchison Widefield Array

    194147_99586_Centaurus_A.pdf (1.232Mb)
    Access Status
    Open access
    Authors
    McKinley, B.
    Briggs, F.
    Gaensler, B.
    Feain, I.
    Bernardi, G.
    Wayth, Randall
    Johnston-Hollitt, M.
    Offringa, A.
    Arcus, Wayne
    Barnes, D.
    Bowman, J.
    Bunton, J.
    Capallo, R.
    Corey, B.
    Deshpande, A.
    deSouza, L.
    Emrich, David
    Goeke, R.
    Greenhill, L.
    Hazelton, B.
    Herne, David
    Hewitt, J.
    Kaplan, David
    Kasper, J.
    Kincaid, B.
    Koenig, R.
    Kratzenberg, E.
    Lonsdale, C.
    Lynch, Mervyn
    McWhirter, S.
    Mitchell, D.
    Morales, M.
    Morgan, E.
    Oberoi, D.
    Ord, Stephen
    Pathikulangara, J.
    Prabu, T.
    Remillard, R.
    Rogers, A.
    Roshi, D.
    Salah, J.
    Sault, R.
    Udaya Shankar, N.
    Srivani, K.
    Stevens, J.
    Subrahmanyan, R.
    Tingay, Steven
    Waterson, Mark
    Webster, R.
    Whitney, A.
    Williams, Andrew
    Williams, C.
    Wyithe, J.
    Date
    2013
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    McKinley, B. and Briggs, F. and Gaensler, B.M. and Feain, I.J. and Bernardi, G. and Wayth, R.B. and Johnston-Hollitt, M. et al. 2013. The giant lobes of Centaurus A observed at 118MHz with the Murchison Widefield Array. Monthly Notices of the Royal Astronomical Society. 436 (2): pp. 1286-1301.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1093/mnras/stt1662
    ISSN
    0035-8711
    Remarks

    ©2013 The Authors; Published by Oxford University Press on behalf of the Royal Astronomical Society

    URI
    http://hdl.handle.net/20.500.11937/42187
    Collection
    • Curtin Research Publications
    Abstract

    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.

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