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          Institute: MPI für Kernphysik     Collection: High-Energy Astrophysics     Display Documents

ID: 395964.0, MPI für Kernphysik / High-Energy Astrophysics
Discovery of very high energy gamma-ray emission from the BL Lacertae object H 2356-309 with the HESS Cherenkov telescopes
Authors:Aharonian, Felix; Akhperjanian, A. G.; Bazer-Bachi, A. R.; Beilicke, M.; Benbow, Wystan; Berge, David; Braun, Isabel; Bernlöhr, Konrad; Bolz, Oliver; Boisson, C:; Glicenstein, J.F.; Breitling, F.; Brown, A. M.; Dickinson, H.J.; Chadwick, P. M.; Egberts, Kathrin; Chounet, L.-M.; Cornils, R.; Costamante, L.; Degrange, B.; Djannati-Atai, A.; Drury, L.O'C.; Emmanoulopoulos, D.; Espigat, P.; Feinstein, F.; Jacholkowska, A.; Fontaine, G.; Funk, Stefan; Gallant, Y. A.; Giebels, B.; Borrel, V.; Goret, P.; Dubus, G.; Hadjichristidis, C.; Hauser, M.; Heinzelmann, G.; Henri, G.; Hermann, German; Hinton, James Anthony; Hofmann, Werner; Holleran, M.; Horns, D.; de Jager, O. C.; Khélifi, Bruno; Komin, N.; Konopelko, A.; Latham, I. J.; Le Gallou, R.; Lemoine-Goumard, M.; Lemière, A.; Lohse, T.; Martin, J. M.; Marcowith, A.; Masterson, Conor; McComb, T. J. L.; de Naurois, M.; Nolan, S. J.; Noutsos, A.; Orford, K. J.; Osborne, J. L.; Ouchrif, M.; Panter, Michael; Pelletier, G.; Pita, S.; Pühlhofer, G.; Punch, M.; Raubenheimer, B. C.; Raue, M.; Rayner, S. M.; Reimer, A.; Reimer, O.; Ripken, J.; Terrier, R.; Rob, L.; Rolland, L.; Rowell, Gavin; Sahakian, V.; Saugé, L.; Schlenker, S.; Schlickeiser, R.; Schwanke, U.; Sol, H.; Steenkamp, R.; Stegmann, C.; Tavernet, J.-P-; Théoret, C. G.; Tluczykont, M.; Venter, C.; Vasileiadis, G.; Vincent, P.; Völk, H. J.; Wagner, S. J.; Martineau-Huynh, O.; Spangler, D.; Bühler, Rolf; Büsching, I.; Carrigan, Svenja; Hauser, Dominik; Jacholkowska, A.; Nedbal, Dalibor; Spanier, F.; Superina, G.; Terrier, R.; van Eldik, Christopher; Ward, M.
Research Context:H.E.S.S.
Date of Publication (YYYY-MM-DD):2006
Title of Journal:Astronomy and Astrophysics
Journal Abbrev.:A&A
Issue / Number:2
Start Page:461
End Page:466
Copyright:© ESO 2006
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:The extreme synchrotron BL Lac object H 2356-309, located at a redshift of z = 0.165, was observed from June to December 2004 with a total exposure of 40 h live-time with the HESS (High Energy Stereoscopic System) array of atmospheric-Cherenkov telescopes (ACTs). Analysis of this data set yields, for the first time, a strong excess of 453 -rays (10 standard deviations above background) from H 2356-309, corresponding to an observed integral flux above 200 GeV of I(>200 GeV) = (4.1 0.5) 10-12 cm-2 s-1 (statistical error only). The differential energy spectrum of the source between 200 GeV and 1.3 TeV is well-described by a power law with a normalisation (at 1 TeV) of N0 = (4.1 0.5) 10-13 cm-2 s-1 TeV-1 and a photon index of = . H 2356-309 is one of the most distant BL Lac objects detected at very-high-energy -rays so far. Results from simultaneous observations from ROTSE-III (optical), RXTE (X-rays) and NRT (radio) are also included and used together with the HESS data to constrain a single-zone homogeneous synchrotron self-Compton (SSC) model. This model provides an adequate fit to the HESS data when using a reasonable set of model parameters.
Free Keywords:H.E.S.S.
gamma rays: observations -- galaxies: active -- galaxies: BL Lacertae objects: individual: H 2356-309
External Publication Status:published
Document Type:Article
Affiliations:MPI für Kernphysik/Group of W. Hofmann/High Energy Astrophysics (F. Aharonian)
MPI für Kernphysik/Group of W. Hofmann/Experimental High-Energy Astrophysics (M. Panter, G. Hermann)
External Affiliations:Yerevan Physics Institute, Yerevan, Armenia
Centre d'Étude Spatiale des Rayonnements, CNRS/UPS, Toulouse, France
Universität Hamburg, Institut für Experimentalphysik, Hamburg, Germany
Institut für Physik, Humboldt-Universität zu Berlin, Germany
LUTH, UMR 8102 du CNRS, Observatoire de Paris, Section de Meudon, France
University of Durham, Department of Physics, Durham, UK
Unit for Space Physics, North-West University, Potchefstroom, South Africa
Laboratoire Leprince-Ringuet, IN2P3/CNRS, École Polytechnique, Palaiseau, France
e-mail: martin.tluczykont@poly.in2p3.fr
European Associated Laboratory for Gamma-Ray Astronomy, jointly supported by CNRS and MPG
APC, Paris, France ()
Dublin Institute for Advanced Studies, Ireland
Landessternwarte, Universität Heidelberg, Germany
Laboratoire de Physique Théorique et Astroparticules, IN2P3/CNRS, Université Montpellier II, CC 70, France
DAPNIA/DSM/CEA, CE Saclay, France
Laboratoire d'Astrophysique de Grenoble, INSU/CNRS, Université Joseph Fourier, France
Institut für Astronomie und Astrophysik, Universität Tübingen, Germany
Laboratoire de Physique Nucléaire et de Hautes Énergies, IN2P3/CNRS, Universités Paris VI & VII, France
Institute of Particle and Nuclear Physics, Charles University, Prague, Czech Republic
Institut für Theoretische Physik, Lehrstuhl IV: Weltraum und Astrophysik, Ruhr-Universität Bochum, Germany
University of Namibia, Windhoek, Namibia
Now at DESY, Platanenallee 6, 15738 Zeuthen, Germany
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