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    HESS and Fermi-LAT discovery of γ-rays from the blazar 1ES 1312-423

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    2013Hess_Fermi.pdf (2.763Mb)
    Date
    2013
    Author
    Abramowski, A.
    Casanova, S.
    Krüger, P.P.
    Pekeur, N.W.
    Sushch, I.
    Venter, C.
    Vorster, M.
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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 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.
    URI
    http://hdl.handle.net/10394/14742
    https://doi.org/10.1093/mnras/stt1081
    http://mnras.oxfordjournals.org/
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    • Faculty of Natural and Agricultural Sciences [3809]

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