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26 April 2024

» arxiv » 1411.1487

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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
B. McKinley ; R. Yang ; M. López-Caniego ; F. Briggs ; N. Hurley-Walker ; R. B. Wayth ; A. R. Offringa ; R. Crocker ; G. Bernardi ; P. Procopio ; B. M. Gaensler ; S. J. Tingay ; M. Johnston-Hollitt ; M. McDonald ; M. Bell ; N. D. R. Bhat ; J. D. Bowman ; R. J. Cappallo ; B. E. Corey ; A. A. Deshpande ; D. Emrich ; A. Ewall-Wice ; L. Feng ; R. Goeke ; L. J. Greenhill ; B. J. Hazelton ; J. N. Hewitt ; L. Hindson ; D. Jacobs ; D. L. Kaplan ; J. C. Kasper ; E. Kratzenberg ; N. Kudryavtseva ; E. Lenc ; C. J. Lonsdale ; M. J. Lynch ; S. R. McWhirter ; D. A. Mitchell ; M. F. Morales ; E. Morgan ; D. Oberoi ; S. M. Ord ; B. Pindor ; T. Prabu ; J. Riding ; A. E. E. Rogers ; D. A. Roshi ; N. Udaya Shankar ; K. S. Srivani ; R. Subrahmanyan ; M. Waterson ; R. L. Webster ; A. R. Whitney ; A. Williams ; C. L. Williams ;
Date:	6 Nov 2014
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.
Source:	arXiv, 1411.1487
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