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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

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        Author
        McKinley, B.
        Yang, R.
        López-Caniego, M.
        Briggs, F.
        Hurley-Walker, N.
        Wayth, R. B.
        Offringa, A. R.
        Crocker, R.
        Bernardi, G.
        Procopio, P.
        Gaensler, B. M.
        Tingay, S. J.
        Johnston-Hollitt, M.
        McDonald, M.
        Bell, M.
        Bhat, N. D. R.
        Bowman, J. D.
        Cappallo, R. J.
        Corey, B. E.
        Deshpande, A. A.
        Emrich, D.
        Ewall-Wice, A.
        Feng, L.
        Goeke, R.
        Greenhill, L. J.
        Hazelton, B. J.
        Hewitt, J. N.
        Hindson, L.
        Jacobs, D.
        Kaplan, D. L.
        Kasper, J. C.
        Kratzenberg, E.
        Kudryavtseva, N.
        Lenc, E.
        Lonsdale, C. J.
        Lynch, M. J.
        McWhirter, S. R.
        Mitchell, D. A.
        Morales, M. F.
        Morgan, E.
        Oberoi, D.
        Ord, S. M.
        Pindor, B.
        Prabu, T.
        Riding, J.
        Rogers, A. E. E.
        Roshi, D. A.
        Shankar, N. Udaya
        Srivani, K. S.
        Subrahmanyan, R.
        Waterson, M.
        Webster, R. L.
        Whitney, A. R.
        Williams, A.
        Williams, C. L.
        Attention
        2299/18999
        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 gamma-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 MHz 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 eighteen orders of magnitude, to investigate the origin of the X-ray and gamma-ray emission. A standard leptonic model for the production of both the X-rays and gamma-rays by inverse-Compton scattering does not fit the multi-wavelength observations. Our results best support a scenario where the X-rays are produced by inverse-Compton scattering and the gamma-rays are produced primarily by hadronic processes confined to the filamentary structures of the Fornax A lobes.
        Publication date
        2015-02-01
        Published in
        Monthly Notices of the Royal Astronomical Society
        Published version
        https://doi.org/10.1093/mnras/stu2310
        Other links
        http://hdl.handle.net/2299/18999
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