Discovery of high and very high-energy emission from the BL Lac object SHBL J001355.9-185406

Collaboration
Apr 15, 2013
8 pages
Published in:
  • Astron.Astrophys. 554 (2013) A72
e-Print:
Experiments:

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Abstract: (arXiv)
The detection of the high-frequency peaked BL Lac object (HBL) SHBL J001355.9-185406 (zz=0.095) at high (HE; 100 MeV<<E<<300 GeV) and very high-energy (VHE; E>100GeVE>100\,{\rm GeV}) with the \fer\ Large Area Telescope (LAT) and the High Energy Stereoscopic System (H.E.S.S.) is reported. Dedicated observations have been performed with the H.E.S.S. telescopes, leading to a detection at the 5.5σ5.5\,\sigma significance level. The measured flux above 310 GeV is (8.3±1.7stat±1.7sys)×1013(8.3 \pm 1.7_{\rm{stat}}\pm 1.7_{\rm{sys}})\times 10^{-13} photons \cms\ (about 0.6% of that of the Crab Nebula), and the power law spectrum has a photon index of \indexHESS. Using 3.5 years of publicly available \fla\ data, a faint counterpart has been detected in the LAT data at the 5.5σ5.5\,\sigma significance level, with an integrated flux above 300 MeV of (9.3±3.4stat±0.8sys)×1010(9.3 \pm 3.4_{\rm stat} \pm 0.8_{\rm sys})\times 10^{-10} photons \cms\ and a photon index of Γ=1.96±0.20stat±0.08sys\Gamma = 1.96 \pm 0.20_{\rm stat} \pm 0.08_{\rm sys}. X-ray observations with \textit{Swift}-XRT allow the synchrotron peak energy in νFν\nu F_\nu representation to be located at 1.0keV\sim 1.0\,{\rm keV}. The broadband spectral energy distribution is modelled with a one-zone synchrotron self-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 for HBLs detected at VHE, with a particle dominated jet.
Note:
  • 8 pages, 5 figures
  • gamma rays: observations
  • Galaxies: active
  • Galaxies: jets
  • BL Lacertae objects: individual objects: SHBL J001355.9-185406
  • energy: high
  • photon
  • VHE
  • galaxy
  • synchrotron
  • flux