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Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/6184
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dc.contributor.authorMcKinley, B.-
dc.contributor.authorYang, R.-
dc.contributor.authorDeshpande, A.A.-
dc.contributor.authorUdaya Shankar, N.-
dc.contributor.authorSrivani, K.S.-
dc.contributor.authorSubrahmanyan, Ravi-
dc.contributor.author+40 Co-authors-
dc.date.accessioned2015-02-25T10:46:01Z-
dc.date.available2015-02-25T10:46:01Z-
dc.date.issued2015-02-04-
dc.identifier.citationMonthly Notices of the Royal Astronomical Society, 2015, Vol. 446, p3478-3491en
dc.identifier.issn0035-8711-
dc.identifier.issn1365-2966 - (online)-
dc.identifier.urihttp://hdl.handle.net/2289/6184-
dc.descriptionOpen Accessen
dc.description.abstractWe 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.en
dc.language.isoenen
dc.publisherOxford University Press for The Royal Astronomical Societyen
dc.relation.urihttp://adsabs.harvard.edu/abs/2015MNRAS.446.3478Men
dc.relation.urihttp://arxiv.org/abs/1411.1487en
dc.relation.urihttp://dx.doi.org/10.1093/mnras/stu2310en
dc.rights2015 The authors & the Royal Astronomical Societyen
dc.subjectactive galaxiesen
dc.subjectNGC1316 radio continuumen
dc.titleModelling of the spectral energy distribution of Fornax A: leptonic and hadronic production of high-energy emission from the radio lobesen
dc.typeArticleen
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