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    Modelling of the spectral energy distribution of Fornax A: leptonic and hadronic production of high-energy emission from the radio lobes

    231422_231422.pdf (3.962Mb)
    Access Status
    Open access
    Authors
    McKinley, B.
    Yang, R.
    López-Caniego, M.
    Briggs, F.
    Hurley-Walker, N.
    Wayth, Randall
    Offringa, A.
    Crocker, R.
    Bernardi, G.
    Procopio, P.
    Gaensler, B.
    Tingay, Steven
    Johnston-Hollitt, M.
    McDonald, M.
    Bell, M.
    Bhat, N.
    Bowman, J.
    Cappallo, R.
    Corey, B.
    Deshpande, A.
    Emrich, D.
    Ewall-Wice, A.
    Feng, L.
    Goeke, R.
    Greenhill, L.
    Hazelton, B.
    Hewitt, J.
    Hindson, L.
    Jacobs, D.
    Kaplan, D.
    Kasper, J.
    Kratzenberg, E.
    Kudryavtseva, N.
    Lenc, E.
    Lonsdale, C.
    Lynch, M.
    McWhirter, S.
    Mitchell, D.
    Morales, M.
    Morgan, E.
    Oberoi, D.
    Ord, Stephen
    Pindor, B.
    Prabu, T.
    Riding, J.
    Rogers, A.
    Roshi, D.
    Shankar, N.
    Srivani, K.
    Subrahmanyan, R.
    Waterson, M.
    Webster, R.
    Whitney, A.
    Williams, A.
    Williams, C.
    Date
    2015
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    McKinley, B. and Yang, R. and López-Caniego, M. and Briggs, F. and Hurley-Walker, N. and Wayth, R. and Offringa, A. et al. 2015. Modelling of the spectral energy distribution of Fornax A: leptonic and hadronic production of high-energy emission from the radio lobes. Monthly Notices of the Royal Astronomical Society. 446 (4): pp. 3478-3491.
    Source Title
    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
    DOI
    10.1093/mnras/stu2310
    ISSN
    0035-8711
    School
    Department of Electrical and Computer Engineering
    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/20.500.11937/38473
    Collection
    • Curtin Research Publications
    Abstract

    We present new low-frequency observations of the nearby radio galaxy Fornax A at 154 MHz with the Murchison Widefield Array, microwave flux-density measurements obtained from WMAP and Planck data, and γ-ray flux densities obtained from Fermi data. We also compile a comprehensive list of previously published images and flux-density measurements at radio, microwave and X-ray energies. A detailed analysis of the spectrum of Fornax A between 154 and 1510 MHz reveals that both radio lobes have a similar spatially averaged spectral index, and that there exists a steep-spectrum bridge of diffuse emission between the lobes. Taking the spectral index of both lobes to be the same, we model the spectral energy distribution of Fornax A across an energy range spanning 18 orders of magnitude, to investigate the origin of the X-ray and γ-ray emission. A standard leptonic model for the production of both the X-rays and γ-rays by inverse-Compton scattering does not fit the multiwavelength observations. Our results best support a scenario where the X-rays are produced by inverse-Compton scattering and the γ-rays are produced primarily by hadronic processes confined to the filamentary structures of the Fornax A lobes.

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