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  Observations of Selected AGN with H.E.S.S

Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., Berge, D., et al. (2005). Observations of Selected AGN with H.E.S.S. Astrophysics & Astronomy, 441(2), 465-472. doi:10.1051/0004-6361:20053478.

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http://dx.doi.org/10.1051/0004-6361:20053478 (Publisher version)


Aharonian, F.1, Author           
Akhperjanian, A. G.1, Author           
Bazer-Bachi, A. R.2, Author
Beilicke, M.1, Author           
Benbow, W.1, Author           
Berge, D.1, Author           
Borrel, V.2, Author
Bernlöhr, K.1, Author           
Bolz, O.1, Author           
Boisson, C:2, Author
Glicenstein, J.F.1, Author           
Breitling, F.2, Author
Brown, A. M.2, Author
Dickinson, H.J.2, Author
Chadwick, P. M.2, Author
Braun, I.1, Author           
Chounet, L.-M.2, Author
Cornils, R.1, Author           
Costamante, L.1, Author           
Degrange, B.2, Author
Djannati-Atai, A.1, Author           Drury, L.O'C.2, AuthorEmmanoulopoulos, D.2, AuthorEspigat, P.2, AuthorFeinstein, F.1, Author           Jacholkowska, A.2, AuthorFontaine, G.2, AuthorFunk, S.1, Author           Gallant, Y. A.1, Author           Giebels, B.2, AuthorGillessen, S.1, Author           Goret, P.2, AuthorDubus, G.1, Author           Hadjichristidis, 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, AuthorKhélifi, B.1, Author           Komin, N.2, AuthorKonopelko, A.3, Author           Latham, I. J.2, AuthorLe Gallou, R.2, AuthorLemoine-Goumard, 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, AuthorFuchs, Y.2, AuthorPühlhofer, G.1, Author           Punch, M.2, AuthorRaubenheimer, B. C.2, AuthorRaue, M.1, Author           Raux, J.2, AuthorRayner, S. M.2, AuthorMartin, J.M.2, AuthorReimer, A.2, AuthorReimer, O.2, AuthorRipken, J.2, AuthorTerrier, R.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, AuthorVenter, C.2, AuthorVasileiadis, G.1, Author           Vincent, P.2, AuthorVölk, H. J.3, Author           Wagner, S. J.2, AuthorMartineau-Huynh, O.2, AuthorSpangler, D.2, Author more..
1Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society, ou_904550              
2Yerevan Physics Institute, ArmeniaUniversity of Durham, Department of Physics, UKCentre d'Etudes Spatiales des Rayonnements, CNRS/UPS Toulouse, FranceUniversität Hamburg, Institut für Experimentalphysik, GermanyInstitut für Physik, Humboldt-Universität zu Berlin, GermanyLUTH, UMR 8102 du CNRS, Observatoire de Paris, Section de Meudon, FranceGroupe d'astroparticules de Montpellier, IN2P3/CNRS, Université Montpellier II, FranceLaboratoire de Physique Nucléaire et de Hautes Energies, IN2P3/CNRS, Universités Paris VI & VII, Jussieu, FranceEuropean Associated Laboratory for Gamma-Ray Astronomy, jointly supported by CNRS and MPGLaboratoire Leprince-Ringuet, IN2P3/CNRS, Ecole Polytechnique, Palaiseau, FranceDublin Institute for Advanced Studies, IrelandService d'Astrophysique. DAPNIA/DSM/CEA, CE Saclay, Gif-sur-Yvette, FranceLandessternwarte, Königstuhl, Heidelberg, GermanyLaboratoire d'Astrophysique de Grenoble, INSU/CNRS, Université Joseph Fourier, FranceUnit for Space Physics, North-West University, Potchefstroom, South AfricaInstitut für theoretische Physik, Lehrstuhl IV, Ruhr-Universität Bochum, GermanyInstitute of Particle and Nuclear Physics, Charles University, Prague, Czech RepublicUniversity of Namibia, Windhoek, NamibiaAPC, Paris, FranceDAPNIA/DSM/CEA, CE Saclay, Gif-sur-Yvette, France, ou_persistent22              
3Prof. Heinrich J. Völk, Emeriti, MPI for Nuclear Physics, Max Planck Society, ou_907548              


Free keywords: Galaxies : active - BL Lacertae objects. individual - Gamma rays: observations H.E.S.S.
 MPINP: HESS - Abteilung Hofmann
 Abstract: A sample of selected active galactic nuclei (AGN) was observed in 2003 and 2004 with the High Energy Stereoscopic System (H.E.S.S.), an array of imaging atmospheric-Cherenkov telescopes in Namibia. The redshifts of these candidate very-high-energy (VHE, >100 GeV) gamma-ray emitters range from z=0.00183 to z=0.333. Significant detections were already reported for some of these objects, such as PKS 2155-304 and Markarian 421. Marginal evidence (3.1 sigma) for a signal is found from large-zenith-angle observations of Markarian 501, corresponding to an integral flux of I(>1.65 TeV) = (1.5 +/- 0.6 (stat) +/- 0.3 (syst)) x 10^{-12} cm^{-2} s^{-1} or ~15% of the Crab Nebula flux. Integral flux upper limits for 19 other AGN, based on exposures of ~1 to ~8 hrs live time, and with average energy thresholds between 160 GeV and 610 GeV, range from 0.4% to 5.1% of the Crab Nebula flux. All the upper limits are the most constraining ever reported for these objects.


Language(s): eng - English
 Dates: 2005-10
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1051/0004-6361:20053478
 Degree: -



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Source 1

Title: Astrophysics & Astronomy
  Other : Astrophys. Astron.
Source Genre: Journal
Publ. Info: Berlin : Springer-Verlag
Pages: - Volume / Issue: 441 (2) Sequence Number: - Start / End Page: 465 - 472 Identifier: ISSN: 0004-6361
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219