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

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; $E>100\mathrm{GeV}$) 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 $5.5\sigma$ significance level. The measured flux above 310 GeV is $(8.3\pm 1.7_{\mathrm{stat}}\pm 1.7_{\mathrm{sys}})\times 10^{-13}$ 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 $5.5\sigma$ significance level, with an integrated flux above 300 MeV of $(9.3\pm 3.4_{\mathrm{stat}}\pm 0.8_{\mathrm{sys}})\times 10^{-10}$ photons \cms\ and a photon index of $\Gamma =1.96\pm 0.20_{\mathrm{stat}}\pm 0.08_{\mathrm{sys}}$. X-ray observations with \textit{Swift}-XRT allow the synchrotron peak energy in $\nu F_{\nu }$ representation to be located at $\sim 1.0\mathrm{keV}$. 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.

8 pages, 5 figures

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