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Anton, G; Balzer, A; Becker Tjus, J; Bernlöhr, K; Bissaldi, E; Brun, P; Carrigan, S; Chalme-Calvet, R; Chaves, R. C. G; Cheesebrough, A; Couturier, C; Daniel, M. K; Deil, C; deWilt, P; Dubus, G; Dutson, K; Dyks, J; Egberts, K; Eger, P; Fegan, S; Fernandez, D; Fiasson, A; Gajdus, M; Gallant, Y. A; Garrigoux, T; Gast, H; Giebels, B; Glicenstein, J. F; Göring, D; Grudzi ska, M; Häffner, S; Hague, J. D; Hahn, J; Henri, G; Hermann, G; Hervet, O; Holler, M; Jacholkowska, A; Katz, U; Kaufmann, S; Khélifi, B; Kneiske, T; Kolitzus, D; Krayzel, F; Krüger, P. P; Lamanna, G; Lemoine-Goumard, M; Lenain, J.-P; Marandon, V; Mayer, M; Medina, M. C; Méhault, J; Menzler, U; Meyer, M; Moderski, R; Moulin, E; Murach, T; Niemiec, J; Oakes, L; Ohm, S; de Oña Wilhelmi, E; Opitz, B; Ostrowski, M; Oya, I; Pekeur, N. W; Petrucci, P.-O; Peyaud, B; Poon, H; Pühlhofer, G; Punch, M; Raue, M; Reimer, O; Rob, L; Rosier-Lees, S; Rowell, G; Sahakian, V; Sanchez, D. A; Schwanke, U; Schwarzburg, S; Schwemmer, S; Sol, H; Stegmann, C; Stinzing, F; Stycz, K; Tavernet, J.-P; Terrier, R; Tluczykont, M; van Eldik, C; Vasileiadis, G; Viana, A; Vincent, P; Volpe, F; Vorster, M; Wagner, P; Ward, M; White, R; Willmann, P; Wouters, D; Zdziarski, A. A; Zechlin, H.-S
Monthly notices of the Royal Astronomical Society, 2013, Letnik: 434, Številka: 3Journal Article
A deep observation campaign carried out by the High Energy Stereoscopic System (HESS) on Centaurus A enabled the discovery of γ-rays from the blazar 1ES 1312−423, 2° away from the radio galaxy. With a differential flux at 1 TeV of φ(1 TeV) = (1.9 ± 0.6stat ± 0.4sys) × 10−13 cm−2 s−1 TeV−1 corresponding to 0.5 per cent of the Crab nebula differential flux and a spectral index Γ = 2.9 ± 0.5stat ± 0.2sys, 1ES 1312−423 is one of the faintest sources ever detected in the very high energy (E > 100 GeV) extragalactic sky. A careful analysis using three and a half years of Fermi Large Area Telescope (Fermi-LAT) data allows the discovery at high energies (E > 100 MeV) of a hard spectrum (Γ = 1.4 ± 0.4stat ± 0.2sys) source coincident with 1ES 1312−423. Radio, optical, UV and X-ray observations complete the spectral energy distribution of this blazar, now covering 16 decades in energy. The emission is successfully fitted with a synchrotron self-Compton model for the non-thermal component, combined with a blackbody spectrum for the optical emission from the host galaxy.
