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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

McKinley, B., Yang, R., López-Caniego, M., Briggs, F., Hurley-Walker, N., Wayth, R. B., et al. (2014). Modelling of the Spectral Energy Distribution of Fornax A: Leptonic and Hadronic Production of High Energy Emission from the Radio Lobes. Monthly Notices of the Royal Astronomical Society, 446(4), 3478-3491. doi:10.1093/mnras/stu2310.

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McKinley, B., Autor
Yang, Ruizhi1, Autor           
López-Caniego, M., Autor
Briggs, F., Autor
Hurley-Walker, N., Autor
Wayth, R. B., Autor
Offringa, A. R., Autor
Crocker, R., Autor
Bernardi, G., Autor
Procopio, P., Autor
Gaensler, B. M., Autor
Tingay, S. J., Autor
Johnston-Hollitt, M., Autor
McDonald, M., Autor
Bell, M., Autor
Bhat, N. D. R., Autor
Bowman, J. D., Autor
Cappallo, R. J., Autor
Corey, B. E., Autor
Deshpande, A. A., Autor
Emrich, D., AutorEwall-Wice, A., AutorFeng, L., AutorGoeke, R., AutorGreenhill, L. J., AutorHazelton, B. J., AutorHewitt, J. N., AutorHindson, L., AutorJacobs, D., AutorKaplan, D. L., AutorKasper, J. C., AutorKratzenberg, E., AutorKudryavtseva, N., AutorLenc, E., AutorLonsdale, C. J., AutorLynch, M. J., AutorMcWhirter, S. R., AutorMitchell, D. A., AutorMorales, M. F., AutorMorgan, E., AutorOberoi, D., AutorOrd, S. M., AutorPindor, B., AutorPrabu, T., AutorRiding, J., AutorRogers, A. E. E., AutorRoshi, D. A., AutorShankar, N. Udaya, AutorSrivani, K. S., AutorSubrahmanyan, R., AutorWaterson, M., AutorWebster, R. L., AutorWhitney, A. R., AutorWilliams, A., AutorWilliams, C. L., Autor mehr..
Affiliations:
1Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society, ou_904550              

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Schlagwörter: Astrophysics, High Energy Astrophysical Phenomena, astro-ph.HE
 MPINP: Hochenergie-Astrophysik Theorie - Abteilung Hofmann
 Zusammenfassung: 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.

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 Datum: 2014-12-08
 Publikationsstatus: Online veröffentlicht
 Seiten: 16 pages, 11 figures
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: -
 Identifikatoren: DOI: 10.1093/mnras/stu2310
 Art des Abschluß: -

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Titel: Monthly Notices of the Royal Astronomical Society
  Andere : Mon. Not. R. Astron. Soc.
Genre der Quelle: Zeitschrift
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Affiliations:
Ort, Verlag, Ausgabe: Oxford : Oxford University Press
Seiten: - Band / Heft: 446 (4) Artikelnummer: - Start- / Endseite: 3478 - 3491 Identifikator: ISSN: 1365-8711
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000024150