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.
DOIAbstract
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 ~...
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