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Observations of Selected AGN with HESS

Aharonian, F. / G. Akhperjanian, A. / R. Bazer-Bachi, A. / Beilicke, M. / Benbow, W. / Berge, D. / Bernlöhr, K. / Boisson, C. / Bolz, O. / Borrel, V. / Braun, I. / Breitling, F. / M. Brown, A. / M. Chadwick, P. / Chounet, L.-M. / Cornils, R. / Costamante, L. / Degrange, B. / Dickinson, H.J. / Djannati-Ataï, A. / L. O'C., Drury / Dubus, G. / Emmanoulopoulos, D. / Espigat, P. / Feinstein, F. / Fontaine, G. / Fuchs, Y. / Funk, S. / Gallant, Y.A. / Giebels, B. / Gillessen, S. / Glicenstein, J.F. / Goret, P. / Hadjichristidis, C. / Hauser, M. / Heinzelmann, G. / Henri, G. / Hermann, G. / A. Hinton, J. / Hofmann, W. / Holleran, M. / Horns, D. / Jacholkowska, A. / Dejager, O.C. / Khélifi, B. / Komin, Nu. / Konopelko, A. / J. Latham, I. / Le Gallou, R. / Lemière, A. / Lemoine-Goumard, M. / Leroy, N. / Lohse, T. / Martin, J.M. / Martineau-Huynh, O. / Marcowith, A. / Masterson, C. / J. L. Mccomb, T. / De Naurois, M. / J. Nolan, S. / Noutsos, A. / J. Orford, K. / L. Osborne, J. / Ouchrif, M. / Panter, M. / Pelletier, G. / Pita, S. / Pühlhofer, G. / Punch, M. / C. Raubenheimer, B. / Raue, M. / Raux, J. / M. Rayner, S. / Reimer, A. / Reimer, O. / Ripken, J. / Rob, L. / Rolland, L. / Rowell, G. / Sahakian, V. / Saugé, L. / Schlenker, S. / Schlickeiser, R. / Schuster, C. / Schwanke, U. / Siewert, M. / Sol, H. / Spangler, D. / Steenkamp, R. / Stegmann, C. / Tavernet, J.-P. / Terrier, R. / Théoret, C.G. / Tluczykont, M. / Vasileiadis, G. / Venter, C. / Vincent, P. / J. Völk, H. / J. Wagner, S. - 2015
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.

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