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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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
2015Type
Journal Article
Metadata
Show full item recordAbstract
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.
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
Department
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.
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