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research
Modelling of the Spectral Energy Distribution of Fornax A : Leptonic and Hadronic Production of High Energy Emission from the Radio Lobes
Authors
A. A. Deshpande
A. E. E. Rogers
+127 more
A. Ewall-Wice
A. R. Offringa
A. R. Whitney
A. Williams
Abdo
Abdo
Atwood
B. E. Corey
B. J. Hazelton
B. M. Gaensler
B. McKinley
B. Pindor
Bennett
Bennett
Bennett
Bernardi
Bolton
Bowman
C. J. Lonsdale
C. L. Williams
Cameron
Carilli
Carilli
Chen
Crocker
Crocker
D. A. Mitchell
D. A. Roshi
D. Emrich
D. Jacobs
D. L. Kaplan
D. Oberoi
E. Kratzenberg
E. Lenc
E. Morgan
Ekers
Ellis
F. Briggs
Feigelson
Finlay
Fomalont
Franceschini
G. Bernardi
Gaensler
Gardner
Georganopoulos
Gizani
Gooch
Górski
Hurley-Walker
Isobe
Iyomoto
J. C. Kasper
J. D. Bowman
J. N. Hewitt
J. Riding
Jacobs
Jarosik
Jones Paul
K. S. Srivani
Kaneda
Katz-Stone
Kühr
L. Feng
L. Hindson
L. J. Greenhill
Lanz
Laurent-Muehleisen
Leahy
Lonsdale
M. Bell
M. F. Morales
M. J. Lynch
M. Johnston-Hollitt
M. López-Caniego
M. McDonald
M. Waterson
Madore
McGee
McKinley
Mills
Mills
N. D. R. Bhat
N. Hurley-Walker
N. Kudryavtseva
N. Udaya Shankar
Nolan
Offringa
Offringa
Offringa
P. Procopio
Pacholczyk
Perley
Piddington
Planck Collaboration I
Planck Collaboration IX
Planck Collaboration V
Planck Collaboration VIII
Planck Collaboration XXVIII
R. B. Wayth
R. Crocker
R. Goeke
R. J. Cappallo
R. L. Webster
R. Subrahmanyan
R. Yang
Robertson
S. J. Tingay
S. M. Ord
S. R. McWhirter
Scheuer
Schwab
Seta
Shain
Shain
Shaya
Shimmins
Slee
Slee
Stanley
Swarup
T. Prabu
Tashiro
Tauber
Tingay
Winter
Yang
Publication date
1 February 2014
Publisher
'Oxford University Press (OUP)'
Doi
Cite
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on
arXiv
Abstract
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.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.Peer reviewe
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