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We present new low-frequency observations of the nearby radio galaxy Fornax Aat 154 MHz with the Murchison Widefield Array, microwave flux-densitymeasurements obtained from WMAP and Planck data, and gamma-ray flux densitiesobtained from Fermi data. We also compile a comprehensive list of previouslypublished images and flux-density measurements at radio, microwave and X-rayenergies. A detailed analysis of the spectrum of Fornax A between 154 MHz and1510 MHz reveals that both radio lobes have a similar spatially-averagedspectral index, and that there exists a steep-spectrum bridge of diffuseemission between the lobes. Taking the spectral index of both lobes to be thesame, we model the spectral energy distribution of Fornax A across an energyrange spanning eighteen orders of magnitude, to investigate the origin of theX-ray and gamma-ray emission. A standard leptonic model for the production ofboth the X-rays and gamma-rays by inverse-Compton scattering does not fit themulti-wavelength observations. Our results best support a scenario where theX-rays are produced by inverse-Compton scattering and the gamma-rays areproduced primarily by hadronic processes confined to the filamentary structuresof the Fornax A lobes.

Modelling of the Spectral Energy Distribution of Fornax A: Leptonic and Hadronic Production of High Energy Emission from the Radio Lobes