Discovery of high and very high-energy emission from the BL Lacertae object SHBL J001355.9–185406
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A. Abramowski
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Fabio Acero
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F. Aharonian
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A. G. Akhperjanian
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E. Angüner
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G. Anton
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S. Balenderan
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Agnès Balzer
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A. Barnacka
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J. Becker Tjus
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K. Bernlöhr
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E. Birsin
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E. Bissaldi
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C. Boisson
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P. Bordas
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J. Brucker
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S. Carrigan
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S. Casanova
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M. Cerruti
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P. M. Chadwick
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A. Cheesebrough
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S. Colafrancesco
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G. Cologna
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J. Conrad
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M. K. Daniel
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I. D. Davids
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C. Deil
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P. Dewilt
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H. J. Dickinson
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W. Domainko
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L. O’c. Drury
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G. Dubus
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M. Dyrda
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T. Edwards
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K. Egberts
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P. Eger
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C. Farnier
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A. Förster
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M. Füssling
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M. Gajdus
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H. Gast
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D. Göring
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M. Grudzińska
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S. Häffner
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J. D. Hague
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J. Hahn
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J. Harris
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G. Heinzelmann
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G. Henri
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G. Hermann
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O. Hervet
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A. Hillert
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J. A. Hinton
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W. Hofmann
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P. Hofverberg
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M. Lemoine-Goumard
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V. Sahakian
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D. A. Sanchez⋆
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A. Santangelo
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R. Schlickeiser
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F. Schüssler
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S. Schwarzburg
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S. Schwemmer
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H. Sol
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G. Spengler
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F. Spiess
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Ł. Stawarz
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R. Steenkamp
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C. Stegmann
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F. Stinzing
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K. Stycz
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I. Sushch
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A. Szostek
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M. Tluczykont
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K. Valerius
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H.-S. Zechlin
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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; $E>100\,{\rm GeV}$) 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 $5.5\,\sigma$ significance level. The measured flux above 310 GeV is $(8.3 \pm 1.7_{\rm{stat}}\pm 1.7_{\rm{sys}})\times 10^{-13}$ 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 $5.5\,\sigma$ significance level, with an integrated flux above 300 MeV of $(9.3 \pm 3.4_{\rm stat} \pm 0.8_{\rm sys})\times 10^{-10}$ photons \cms\ and a photon index of $\Gamma = 1.96 \pm 0.20_{\rm stat} \pm 0.08_{\rm sys}$. X-ray observations with \textit{Swift}-XRT allow the synchrotron peak energy in $\nu F_\nu$ representation to be located at $\sim 1.0\,{\rm keV}$. 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.
Origin : Publication funded by an institution
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