H.E.S.S. Observations of PKS 2155-304

Aharonian, F.; Akhperjanian, A. G.; Aye, K.-M.; Bazer-Bachi, A. R.; Beilicke, M.; Benbow, W.; Berge, D.; Berghaus, P.; Bernlöhr, K.; Bolz, O.; Boisson, C:; Borgmeier, C.; Breitling, F.; Brown, A. M.; Bussons Gordo, J.; Chadwick, P. M.; Chitnis, V. R.; Chounet, L.-M.; Cornils, R.; Costamante, L.; Degrange, B.; Djannati-Atai, A.; Drury, L.O'C.; Ergin, T.; Espigat, P.; Feinstein, F.; Fleury, P.; Fontaine, G.; Funk, S.; Gallant, Y. A.; Giebels, B.; Gillessen, S.; Goret, P.; Guy, J.; Hadjichristidis, C.; Hauser, M.; Heinzelmann, G.; Henri, G.; Hermann, G.; Hinton, J. A.; Hofmann, W.; Holleran, M.; Horns, D.; de Jager, O. C.; Jung, I.; Khélifi, B.; Komin, N.; Konopelko, A.; Latham, I. J.; Le Gallou, R.; Lemoine, M.; Lemière, A.; Leroy, N.; Lohse, T.; Marcowith, A.; Masterson, C.; McComb, T. J. L.; de Naurois, M.; Nolan, S. J.; Noutsos, A.; Orford, K. J.; Osborne, J. L.; Ouchrif, M.; Panter, M.; Pelletier, G.; Pita, S.; Pohl, M.; Pühlhofer, G.; Punch, M.; Raubenheimer, B. C.; Raue, M.; Raux, J.; Rayner, S. M.; Redondo, I.; Reimer, A.; Reimer, O.; Ripken, J.; Rivoal, M.; Rob, L.; Rolland, L.; Rowell, G.; Sahakian, V.; Saugé, L.; Schlenker, S.; Schlickeiser, R.; Schuster, C.; Schwanke, U.; Siewert, M.; Sol, H.; Steenkamp, R.; Stegmann, C.; Tavernet, J.-P-; Théoret, C. G.; Tluczykont, M.; van der Walt, D. J.; Vasileiadis, G.; Vincent, P.; Visser, B.; Völk, H. J.; Wagner, S. J.

doi:10.1051/0004-6361:20041853

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H.E.S.S. Observations of PKS 2155-304

Aharonian, F., Akhperjanian, A. G., Aye, K.-M., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., et al. (2005). H.E.S.S. Observations of PKS 2155-304. Astronomy & Astrophysics, 430(3), 865-875. doi:10.1051/0004-6361:20041853.

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Item Permalink: https://hdl.handle.net/11858/00-001M-0000-0011-89A5-2 Version Permalink: https://hdl.handle.net/11858/00-001M-0000-0011-89A6-F

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Creators:
Aharonian, F.¹, Author
Akhperjanian, A. G.¹, Author
Aye, K.-M.², Author
Bazer-Bachi, A. R.², Author
Beilicke, M.¹, Author
Benbow, W.¹, Author
Berge, D.¹, Author
Berghaus, P.², Author
Bernlöhr, K.¹, Author
Bolz, O.¹, Author
Boisson, C:², Author
Borgmeier, C.², Author
Breitling, F.², Author
Brown, A. M.², Author
Bussons Gordo, J.², Author
Chadwick, P. M.², Author
Chitnis, V. R.², Author
Chounet, L.-M.², Author
Cornils, R.¹, Author
Costamante, L.¹, Author
Degrange, B.², AuthorDjannati-Atai, A.¹, Author         Drury, L.O'C.², AuthorErgin, T.², AuthorEspigat, P.², AuthorFeinstein, F.¹, Author         Fleury, P.², AuthorFontaine, G.², AuthorFunk, S.¹, Author         Gallant, Y. A.¹, Author         Giebels, B.², AuthorGillessen, S.¹, Author         Goret, P.², AuthorGuy, J.², AuthorHadjichristidis, C.², AuthorHauser, M.², AuthorHeinzelmann, G.², AuthorHenri, G.², AuthorHermann, G.¹, Author         Hinton, J. A.¹, Author         Hofmann, W.¹, Author         Holleran, M.², AuthorHorns, D.¹, Author         de Jager, O. C.², AuthorJung, I.¹, Author         Khélifi, B.¹, Author         Komin, N.², AuthorKonopelko, A.³, Author         Latham, I. J.², AuthorLe Gallou, R.², AuthorLemoine, M.², AuthorLemière, A.², AuthorLeroy, N.², AuthorLohse, T.², AuthorMarcowith, A.², AuthorMasterson, C.¹, Author         McComb, T. J. L.², Authorde Naurois, M.¹, Author         Nolan, S. J.², AuthorNoutsos, A.², AuthorOrford, K. J.¹, Author         Osborne, J. L.¹, Author         Ouchrif, M.², AuthorPanter, M.¹, Author         Pelletier, G.², AuthorPita, S.², AuthorPohl, M.², AuthorPühlhofer, G.¹, Author         Punch, M.², AuthorRaubenheimer, B. C.², AuthorRaue, M.¹, Author         Raux, J.², AuthorRayner, S. M.², AuthorRedondo, I.², AuthorReimer, A.², AuthorReimer, O.², AuthorRipken, J.², AuthorRivoal, M.², AuthorRob, L.², AuthorRolland, L.², AuthorRowell, G.¹, Author         Sahakian, V.², AuthorSaugé, L.¹, Author         Schlenker, S.², AuthorSchlickeiser, R.², AuthorSchuster, C.², AuthorSchwanke, U.², AuthorSiewert, M.², AuthorSol, H.², AuthorSteenkamp, R.², AuthorStegmann, C.², AuthorTavernet, J.-P-², AuthorThéoret, C. G.², AuthorTluczykont, M.², Authorvan der Walt, D. J.², AuthorVasileiadis, G.¹, Author         Vincent, P.², AuthorVisser, B.², AuthorVölk, H. J.³, Author         Wagner, S. J.², Author more..

Affiliations:
1Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society, ou_904550
2Yerevan Physics Institute, Armenia University of Durham, Department of Physics, UK Centre d'Etudes Spatiales des Rayonnements, CNRS/UPS Toulouse, France Universität Hamburg, Institut für Experimentalphysik, Germany Physique Corpusculaire et Cosmologie, IN2P3/CNRS, Collège de France, Paris, France Institut für Physik, Humboldt-Universität zu Berlin, Germany LUTH, UMR 8102 du CNRS, Observatoire de Paris, Section de Meudon, France Groupe d'astroparticules de Montpellier, IN2P3/CNRS, Université Montpellier II, France Laboratoire de Physique Nucléaire et de Hautes Energies, IN2P3/CNRS, Universités Paris VI & VII, France European Associated Laboratory for Gamma-Ray Astronomy, jointly supported by CNRS and MPG Laboratoire Leprince-Ringuet, IN2P3/CNRS, Ecole Polytechnique, Palaiseau, France Dublin Institute for Advanced Studies, Ireland Service d'Astrophysique. DAPNIA/DSM/CEA, CE Saclay, Gif-sur-Yvette, France Landessternwarte, Königstuhl, Heidelberg, Germany Laboratoire d'Astrophysique de Grenoble, INSU/CNRS, Université Joseph Fourier, France Unit for Space Physics, North-West University, Potchefstroom, South Africa Institut für theoretische Physik, Lehrstuhl IV, Ruhr-Universität Bochum, Germany Institute of Particle and Nuclear Physics, Charles University, Prague, Czech Republic, ou_persistent22
3Prof. Heinrich J. Völk, Emeriti, MPI for Nuclear Physics, Max Planck Society, ou_907548

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Free keywords: galaxies: active -- galaxies: BL Lacertae objects: individual: PKS 2155-304 -- gamma rays: observations

Abstract: The high-frequency peaked BL Lac PKS 2155-304 at redshift z=0.117 has been detected with high significance (~45 ) at energies greater than 160 GeV, using the H.E.S.S. stereoscopic array of imaging air-Cherenkov telescopes in Namibia. A strong signal is found in each of the data sets corresponding to the dark periods of July and October, 2002, and June-September, 2003. The observed flux of VHE gamma rays shows variability on time scales of months, days, and hours. The monthly-averaged integral flux above 300 GeV varies between 10% and 60% of the flux observed from the Crab Nebula. Energy spectra are measured for these individual periods of data taking and are characterized by a steep power law with a time-averaged photon index of Γ= 3.32±0.06 . An improved per degree of freedom is found when either a power law with an exponential cutoff energy or a broken power law are fit to the time-averaged energy spectrum. However, the significance of the improvement is marginal (~2 ). The suggested presence of features in the energy spectrum may be intrinsic to the emission from the blazar, or an indication of absorption of TeV gamma rays by the extragalactic infrared background light.

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Language(s): eng - English

Dates: Date issued: 2005-02-02

Publication Status: Issued

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Identifiers: eDoc: 223191
DOI: 10.1051/0004-6361:20041853

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Title: Astronomy & Astrophysics

Alternative Title : A&A

Source Genre: Journal

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Pages: - Volume / Issue: 430 (3) Sequence Number: - Start / End Page: 865 - 875 Identifier: -