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

A. Abramowski Fabio Acero 1 F. Aharonian A. G. Akhperjanian E. Angüner G. Anton S. Balenderan Agnès Balzer A. Barnacka Y. Becherini 2 J. Becker Tjus K. Bernlöhr E. Birsin E. Bissaldi J. Biteau C. Boisson 2 J. Bolmont P. Bordas J. Brucker F. Brun 3 P. Brun T. Bulik S. Carrigan S. Casanova M. Cerruti 2 P. M. Chadwick R. Chalme-Calvet R. C. G. Chaves A. Cheesebrough M. Chrétien S. Colafrancesco G. Cologna J. Conrad C. Couturier 4 M. Dalton M. K. Daniel I. D. Davids B. Degrange 3 C. Deil P. Dewilt H. J. Dickinson A. Djannati-Ataï 5 W. Domainko L. O'C. Drury G. Dubus K. Dutson J. Dyks M. Dyrda T. Edwards K. Egberts P. Eger P. Espigat 2 C. Farnier S. Fegan F. Feinstein M. V. Fernandes D. Fernandez A. Fiasson 6 G. Fontaine A. Förster M. Füßling M. Gajdus Y. A. Gallant 1 T. Garrigoux 4 H. Gast B. Giebels J. F. Glicenstein D. Göring M. -H. Grondin M. Grudzińska S. Häffner J. D. Hague J. Hahn J. Harris G. Heinzelmann G. Henri G. Hermann O. Hervet 2 A. Hillert J. A. Hinton W. Hofmann P. Hofverberg M. Holler D. Horns A. Jacholkowska C. Jahn M. Jamrozy M. Janiak F. Jankowsky I. Jung M. A. Kastendieck K. Katarzyński U. Katz S. Kaufmann B. Khélifi M. Kieffer S. Klepser D. Klochkov W. Kluźniak T. Kneiske D. Kolitzus Nu. Komin 6 K. Kosack S. Krakau F. Krayzel 6 P. P. Krüger H. Laffon 3 G. Lamanna 6 J. Lefaucheur 2 M. Lemoine-Goumard 7 J. -P. Lenain D. Lennarz T. Lohse A. Lopatin C. -C. Lu V. Marandon A. Marcowith G. Maurin 6 N. Maxted M. Mayer T. J. L. Mccomb M. C. Medina J. Méhault 1 U. Menzler M. Meyer R. Moderski M. Mohamed Emmanuel Moulin T. Murach C. L. Naumann 4 M. de Naurois D. Nedbal J. Niemiec S. J. Nolan L. Oakes S. Ohm E. de Ona Wilhelmi B. Opitz M. Ostrowski I. Oya M. Panter R. D. Parsons M. Paz Arribas N. W. Pekeur G. Pelletier J. Perez P. -O. Petrucci B. Peyaud S. Pita 2 H. Poon G. Pühlhofer M. Punch 2 A. Quirrenbach S. Raab M. Raue A. Reimer O. Reimer M. Renaud R. de Los Reyes F. Rieger L. Rob S. Rosier-Lees 6 G. Rowell B. Rudak C. B. Rulten 2 V. Sahakian D. A. Sanchez A. Santangelo R. Schlickeiser F. Schüssler A. Schulz U. Schwanke S. Schwarzburg S. Schwemmer H. Sol 2 G. Spengler F. Spieß Ł. Stawarz R. Steenkamp C. Stegmann F. Stinzing K. Stycz I. Sushch A. Szostek J. -P. Tavernet 4 R. Terrier 2 M. Tluczykont C. Trichard 6 K. Valerius C. van Eldik G. Vasileiadis C. Venter A. Viana P. Vincent H. J. Völk F. Volpe M. Vorster S. J. Wagner P. Wagner M. Ward M. Weidinger R. White A. Wierzcholska P. Willmann A. Wörnlein D. Wouters M. Zacharias A. Zajczyk A. A. Zdziarski A. Zech 2 H. -S. Zechlin
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.
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Submitted on : Monday, April 29, 2013 - 11:35:33 AM
Last modification on : Wednesday, September 23, 2020 - 4:39:37 AM

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A. Abramowski, Fabio Acero, F. Aharonian, A. G. Akhperjanian, E. Angüner, et al.. Discovery of high and very high-energy emission from the BL Lacertae object SHBL J001355.9–185406. Astronomy and Astrophysics - A&A, EDP Sciences, 2013, 554, pp.A72. ⟨10.1051/0004-6361/201220996⟩. ⟨in2p3-00818810⟩

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