HESS and Fermi-LAT discovery of gamma-rays from the blazar 1ES 1312-423
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2013
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Maxted, N.
Rowell, G.
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Monthly Notices of the Royal Astronomical Society, 2013; 434(3):1889-1901
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HESS Collaboration, A. Abramowski ... N. Maxted ... G. Rowell ... et al.
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Abstract
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 f(1 TeV) = (1.9 ± 0.6<sup>stat</sup> ± 0.4<inf>sys</inf>) × 10<sup>-13</sup> cm<sup>-2</sup> s<sup>-1</sup> TeV<sup>-1</sup> corresponding to 0.5 per cent of the Crab nebula differential flux and a spectral index γ = 2.9 ± 0.5<inf>stat</inf> ± 0.2<inf>sys</inf>, 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 (100 < E 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. © 2013 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society.
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© 2013 The Authors