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    Filaments in the southern giant lobe of Centaurus A: Constraints on nature and origin from modelling and GMRT observations

    73940.pdf (1.789Mb)
    Access Status
    Open access
    Authors
    Wykes, S.
    Intema, Hubertus
    Hardcastle, M.
    Achterberg, A.
    Jones, T.
    Jerjen, H.
    Orrú, E.
    Lazarian, A.
    Shimwell, T.
    Wise, M.
    Kronberg, P.
    Date
    2014
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Wykes, S. and Intema, H. and Hardcastle, M. and Achterberg, A. and Jones, T. and Jerjen, H. and Orrú, E. et al. 2014. Filaments in the southern giant lobe of Centaurus A: Constraints on nature and origin from modelling and GMRT observations. Monthly Notices of the Royal Astronomical Society. 442 (4): pp. 2867-2882.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1093/mnras/stu1033
    ISSN
    0035-8711
    Remarks

    This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2014 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

    URI
    http://hdl.handle.net/20.500.11937/73655
    Collection
    • Curtin Research Publications
    Abstract

    We present results from imaging of the radio filaments in the southern giant lobe of CentaurusA using data from Giant Metrewave Radio Telescope observations at 325 and 235 MHz, and outcomes from filament modelling. The observations reveal a rich filamentary structure, largely matching the morphology at 1.4 GHz. We find no clear connection of the filaments to the jet. We seek to constrain the nature and origin of the vertex and vortex filaments associated with the lobe and their role in high-energy particle acceleration. We deduce that these filaments are at most mildly overpressuredwith respect to the global lobe plasma showing no evidence of largescale efficient Fermi I-type particle acceleration, and persist for ~2-3 Myr. We demonstrate that the dwarf galaxy KK 196 (AM 1318-444) cannot account for the features, and that surface plasma instabilities, the internal sausage mode and radiative instabilities are highly unlikely. An internal tearing instability and the kink mode are allowed within the observational and growth time constraints and could develop in parallel on different physical scales. We interpret the origin of the vertex and vortex filaments in terms of weak shocks from transonic magnetohydrodynamical turbulence or from a moderately recent jet activity of the parent AGN, or an interplay of both. © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.

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