H.E.S.S and Fermi-LAT discovery of gamma rays from the blazar 1ES 1312-423

H.E.S.S. collaboration , A. Abramowski , F. Acero , F. Aharonian , A.G. Akhperjanian , E. Ang\"uner , G. Anton , S. Balenderan

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A. Balzer A. Barnacka Y. Becherini J. Becker Tjus K. Bernl\"ohr E. Birsin E. Bissaldi J. Biteau C. Boisson J. Bolmont P. Bordas J. Brucker F. Brun P. Brun T. Bulik S. Carrigan S. Casanova M. Cerruti P.M. Chadwick R. Chalme-Calvet R.C.G. Chaves A. Cheesebrough M. Chr\'etien 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-Ata\"i W. Domainko L.O'C. Drury G. Dubus K. Dutson J. Dyks M. Dyrda T. Edwards K. Egberts P. Eger P. Espigat C. Farnier S. Fegan F. Feinstein M.V. Fernandes D. Fernandez A. Fiasson G. Fontaine A. F\"orster M. F\"u{\ss}ling M. Gajdus Y.A. Gallant T. Garrigoux H. Gast B. Giebels J.F. Glicenstein D. G\"oring M.-H. Grondin M. Grudzi\'nska S. H\"affner 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. Katarzy\'nski U. Katz S. Kaufmann B. Kh\'elifi M. Kieffer S. Klepser D. Klochkov W. Klu\'zniak T. Kneiske D. Kolitzus Nu. Komin K. Kosack S. Krakau F. Krayzel P.P. Kr\"uger H. Laffon G. Lamanna J. Lefaucheur 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 J. M\'ehault U. Menzler M. Meyer R. Moderski M. Mohamed E. Moulin T. Murach C.L. Naumann M. de Naurois D. Nedbal J. Niemiec S.J. Nolan L. Oakes S. Ohm E. de O\~naWilhelmi 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 H. Poon G. P\"uhlhofer M. Punch 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 A. Santangelo R. Schlickeiser F. Sch\"ussler A. Schulz U. Schwanke S. Schwarzburg S. Schwemmer H. Sol G. Spengler F. Spie{\ss} {\L.} Stawarz R. Steenkamp C. Stegmann F. Stinzing K. Stycz I. Sushch A. Szostek J.-P. Tavernet R. Terrier M. Tluczykont C. Trichard K. Valerius C. van Eldik G. Vasileiadis C. Venter A. Viana P. Vincent H.J. V\"olk F. Volpe M. Vorster S.J. Wagner P. Wagner M. Ward M. Weidinger R. White A. Wierzcholska P. Willmann A. W\"ornlein D. Wouters M. Zacharias A. Zajczyk A.A. Zdziarski A. Zech H.-S. Zechlin J.S. Perkins R. Ojha J. Stevens P. G. Edwards M. Kadler

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keywords energyblazardiscoveryhighstatdifferentialemissionfermi-lat

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A deep observation campaign carried out by the High Energy Stereoscopic System (H.E.S.S.) on Centaurus A enabled the discovery of gamma rays from the blazar 1ES 1312-423, two degrees away from the radio galaxy. With a differential flux at 1 TeV of (1.9 +/-0.6(stat) +/-0.4(sys)) x 10^{-13} /cm^2 /s /TeV corresponding to 0.5% of the Crab nebula differential flux and a spectral index of 2.9 +/- 0.5 (stat) +/- 0.2 (sys), 1ES 1312-423 is one of the faintest sources ever detected in the very high energy (E>100 GeV) extragalactic sky. A careful analysis using three and a half years of Fermi-LAT data allows the discovery at high energies (E>100 MeV) of a hard spectrum (index of 1.4 +/- 0.4 (stat) +/- 0.2 (sys)) source coincident with 1ES 1312-423. Radio, optical, UV and X-ray observations complete the spectral energy distribution of this blazar, now covering 16 decades in energy. The emission is successfully fitted with a synchrotron self Compton model for the non-thermal component, combined with a black-body spectrum for the optical emission from the host galaxy.

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H.E.S.S and Fermi-LAT discovery of gamma rays from the blazar 1ES 1312-423

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