The nature of the multi-wavelength emission of 3C 111

S. De Jong 1 V. Beckmann 2 F. Mattana 1
2 APC - AHE - APC - Astrophysique des Hautes Energies
APC - UMR 7164 - AstroParticule et Cosmologie, Dipartimemto di Astronomia, Universita degli Studi di Bologna
Abstract : We attempt to determine the nature of the high energy emission of the radio galaxy 3C 111, by distinguishing between the effects of the thermal and non-thermal processes. We study the X-ray spectrum of 3C 111 between 0.4 keV and 200 keV, and its spectral energy distribution, using data from the Suzaku satellite combined with INTEGRAL, Swift/BAT data, and Fermi/LAT data. We then model the overall spectral energy distribution including radio and infrared data. The combined Suzaku, Swift and INTEGRAL data are represented by an absorbed exponentially cut-off power-law with reflection from neutral material with a photon index Gamma = 1.68+-0.03, a high-energy cut-off Ecut = 227+143-67 keV, a reflection component with R = 0.7+-0.3 and a Gaussian component to account for the iron emission-line at 6.4 keV with an equivalent width of EW = 85+-11 eV. The X-ray spectrum appears dominated by thermal, Seyfert-like processes, but there are also indications of non-thermal processes. The radio to gamma-ray spectral energy distribution can be fit with a single-zone synchrotron-self Compton model, with no need for an additional thermal component. We suggest a hybrid scenario to explain the broad-band emission, including a thermal component (iron line, reflection) that dominates in the X-ray regime and a non-thermal one to explain the spectral energy distribution.
Contributor : Volker Beckmann <>
Submitted on : Wednesday, September 5, 2012 - 9:16:10 AM
Last modification on : Tuesday, October 11, 2016 - 1:26:00 PM





S. De Jong, V. Beckmann, F. Mattana. The nature of the multi-wavelength emission of 3C 111. Astronomy and Astrophysics - A&A, EDP Sciences, 2012, 545, pp.A90. <10.1051/0004-6361/201219302>. <hal-00728172>




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