Discovery of high and very high-energy emission from the BL Lacertae object SHBL J001355.9-185406
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Date
2013
Authors
Abramowski, A.
de Wilt, P.
Maxted, N.
Rowell, G.
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Astronomy and Astrophysics: a European journal, 2013; 554:A72-1-A72-8
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H.E.S.S. Collaboration, A. Abramowski ... P. deWilt ... N. Maxted ... G. Rowell ... et al.
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Abstract
The detection of the high-frequency peaked BL Lac object (HBL) SHBL J001355.9–185406 (z = 0.095) at high (HE; 100 MeV < E < 300 GeV) and very high-energy (VHE; E > 100 GeV) with the Fermi Large Area Telescope (LAT) and the High Energy Stereoscopic System (H.E.S.S.) is reported. Dedicated observations were performed with the H.E.S.S. telescopes, leading to a detection at the 5.5σ significance level. The measured flux above 310 GeV is (8.3 ± 1.7(stat) ± 1.7(sys)) × 10⁻¹³ photons cm⁻² s⁻¹ (about 0.6% of that of the Crab Nebula), and the power-law spectrum has a photon index of Γ = 3.4 ± 0.5(stat) ± 0.2(sys). Using 3.5 years of publicly available Fermi-LAT data, a faint counterpart has been detected in the LAT data at the 5.5σ significance level, with an integrated flux above 300 MeV of (9.3 ± 3.4(stat) ± 0.8(sys)) × 10⁻¹⁰ photons cm⁻² s⁻¹ and a photon index of Γ = 1.96 ± 0.20(stat) ± 0.08(sys). X-ray observations with Swift-XRT allow the synchrotron peak energy in νF(ν) representation to be located at ~1.0 keV. The broadband spectral energy distribution is modelled with a one-zone synchrotronself-Compton (SSC) model and the optical data by a black-body emission describing the thermal emission of the host galaxy. The derived parameters are typical of HBLs detected at VHE, with a particle-dominated jet.
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© ESO 2013. Article published by EDP Sciences