S. de Jong, V. Beckmann, F. Mattana
In order to determine the nature of the high energy emission of the radio galaxy 3C 111, we aim to disentangle the thermal and non-thermal processes. We study the X-ray spectrum of 3C 111 between 0.4 and 200 keV, and its spectral energy distribution, using data from the Suzaku satellite combined with INTEGRAL, Swift/BAT data and Fermi/LAT data. Then, we 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 for 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) which dominates in the X-ray regime and non-thermal one to explain the spectral energy distribution.
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http://arxiv.org/abs/1207.3308
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