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    Serendipitous discovery of a dying Giant Radio Galaxy associated with NGC 1534, using the murchison widefield array

    Access Status
    Open access
    Authors
    Hurley-Walker, N.
    Johnston-Hollitt, M.
    Ekers, R.
    Hunstead, R.
    Sadler, E.
    Hindson, L.
    Hancock, P.
    Bernardi, G.
    Bowman, J.
    Briggs, F.
    Cappallo, R.
    Corey, B.
    Deshpande, A.
    Emrich, D.
    Gaensler, B.
    Goeke, R.
    Greenhill, L.
    Hazelton, B.
    Hewitt, J.
    Kaplan, D.
    Kasper, J.
    Kratzenberg, E.
    Lonsdale, C.
    Lynch, Mervyn
    Mitchell, D.
    McWhirter, R.
    Morales, M.
    Morgan, E.
    Oberoi, D.
    Offringa, A.
    Ord, S.
    Prabu, T.
    Rogers, A.
    Roshi, A.
    Shankar, U.
    Srivani, K.
    Subrahmanyan, R.
    Tingay, Steven
    Waterson, M.
    Wayth, Randall
    Webster, R.
    Whitney, A.
    Williams, A.
    Williams, C.
    Date
    2015
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Hurley-Walker, N. and Johnston-Hollitt, M. and Ekers, R. and Hunstead, R. and Sadler, E. and Hindson, L. and Hancock, P. et al. 2015. Serendipitous discovery of a dying Giant Radio Galaxy associated with NGC 1534, using the murchison widefield array. Monthly Notices of the Royal Astronomical Society. 447 (3): pp. 2468-2478.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1093/mnras/stu2570
    ISSN
    0035-8711
    School
    Department of Physics and Astronomy
    Remarks

    This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2015 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

    URI
    http://hdl.handle.net/20.500.11937/33240
    Collection
    • Curtin Research Publications
    Abstract

    Recent observations with the Murchison Widefield Array at 185 MHz have serendipitously unveiled a heretofore unknown giant and relatively nearby (z = 0.0178) radio galaxy associated with NGC 1534. The diffuse emission presented here is the first indication that NGC 1534 is one of a rare class of objects (along with NGC 5128 and NGC 612) in which a galaxy with a prominent dust lane hosts radio emission on scales of ~700 kpc. We present details of the radio emission along with a detailed comparison with other radio galaxies with discs. NGC 1534 is the lowest surface brightness radio galaxy known with an estimated scaled 1.4-GHz surface brightness of just 0.2 mJy arcmin−2. The radio lobes have one of the steepest spectral indices yet observed: α = −2.1 ± 0.1, and the core to lobe luminosity ratio is <0.1 per cent. We estimate the space density of this low brightness (dying) phase of radio galaxy evolution as 7 × 10−7 Mpc−3 and argue that normal AGN cannot spend more than 6 per cent of their lifetime in this phase if they all go through the same cycle.

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