{
  "id": "1411.1487",
  "version": "v1",
  "published": "2014-11-06T03:21:00.000Z",
  "updated": "2014-11-06T03:21:00.000Z",
  "title": "Modelling of the Spectral Energy Distribution of Fornax A: Leptonic and Hadronic Production of High Energy Emission from the Radio Lobes",
  "authors": [
    "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"
  ],
  "comment": "16 pages, 11 figures",
  "categories": [
    "astro-ph.HE"
  ],
  "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.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2014-11-06T03:21:00.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "spectral energy distribution",
      "high energy emission",
      "radio lobes",
      "hadronic production",
      "range spanning eighteen orders"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "doi": "10.1093/mnras/stu2310",
      "journal": "Monthly Notices of the Royal Astronomical Society",
      "year": 2015,
      "month": "Feb",
      "volume": 446,
      "number": 4,
      "pages": 3478
    },
    "note": {
      "typesetting": "TeX",
      "pages": 16,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 1326379,
      "adsabs": "2015MNRAS.446.3478M"
    }
  }
}