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

A. Abramowski Fabio Acero F. Aharonian 1 A. G. Akhperjanian E. Angüner G. Anton S. Balenderan A. Balzer A. Barnacka Y. Becherini 2 J. Becker Tjus K. Bernlöhr 1 E. Birsin E. Bissaldi J. Biteau 3, * C. Boisson J. Bolmont P. Bordas J. Brucker F. Brun 1 P. Brun 4 T. Bulik S. Carrigan S. Casanova M. Cerruti P. M. Chadwick R. Chalme-Calvet R. C. G. Chaves 4 A. Cheesebrough M. Chrétien S. Colafrancesco G. Cologna J. Conrad C. Couturier M. Dalton M. K. Daniel I. D. Davids B. Degrange C. Deil P. Dewilt H. J. Dickinson A. Djannati-Ataï 2 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 G. Fontaine A. Förster M. Füßling M. Gajdus Y. A. Gallant T. Garrigoux H. Gast B. Giebels J. F. Glicenstein 4 D. Göring M.-H. Grondin M. Grudzińska S. Häffner J. D. Hague J. Hahn J. Harris G. Heinzelmann G. Henri G. Hermann O. Hervet 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 K. Kosack 4 S. Krakau F. Krayzel P. P. Krüger H. Laffon G. Lamanna J. Lefaucheur 2 M. Lemoine-Goumard J.-P. Lenain D. Lennarz T. Lohse A. Lopatin C.-C. Lu V. Marandon A. Marcowith G. Maurin N. Maxted M. Mayer T. J. L. Mccomb M. C. Medina 4 J. Méhault U. Menzler M. Meyer R. Moderski M. Mohamed E. Moulin 4 T. Murach C. L. Naumann M. de Naurois D. Nedbal J. Niemiec S. J. Nolan L. Oakes S. Ohm E. de Oña 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 4 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 G. Rowell B. Rudak C. B. Rulten V. Sahakian D. A. Sanchez⋆ 1, * A. Santangelo R. Schlickeiser F. Schüssler 4 A. Schulz U. Schwanke S. Schwarzburg S. Schwemmer H. Sol G. Spengler F. Spieß Ł. Stawarz R. Steenkamp C. Stegmann F. Stinzing K. Stycz I. Sushch A. Szostek J.-P. Tavernet R. Terrier 2 M. Tluczykont C. Trichard K. Valerius C. van Eldik G. Vasileiadis C. Venter A. Viana 1 P. Vincent H. J. Völk 1 F. Volpe 1 M. Vorster S. J. Wagner P. Wagner M. Ward M. Weidinger R. White A. Wierzcholska P. Willmann A. Wörnlein D. Wouters 4 M. Zacharias A. Zajczyk A. A. Zdziarski A. Zech H.-S. Zechlin
* Corresponding author
1 MPIK - Max-Planck-Institut für Kernphysik
2 APC - UMR 7164 - AstroParticule et Cosmologie
3 LLR - Laboratoire Leprince-Ringuet
4 DAP - Département d'Astrophysique (ex SAP)
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 ± 1.7stat ± 1.7sys) × 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 ± 0.5stat ± 0.2sys. 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 ± 3.4stat ± 0.8sys) × 10-10 photons cm-2 s-1 and a photon index of Γ = 1.96 ± 0.20stat ± 0.08sys. X-ray observations with Swift-XRT allow the synchrotron peak energy in νFν 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.
Keywords : gamma rays: general BL Lacertae objects: individual: SHBL J001355.9-185406
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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⟩. ⟨cea-01135393⟩

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