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

Benbow, Wystan; W. Benbow for the H.E.S.S. Collaboration

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

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Benbow, Wystan
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Citation

Benbow, W. (2005). Observations of Selected AGN with H.E.S.S. In B. S. Acharya, S. Gupta, P. Jagadeesan, A. Jain, S. Karthikeyan, S. Morris, et al. (Eds.), Proceedings of the 29th International Cosmic Ray Conference (pp. 303-306). Navy Nagar, Colaba, Mumbai, MH-400005: Tata Institute of Fundamental Research.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0011-8781-4

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) γ-ray emitters range from ≉=0.00183 to ≉=0.333. Significant detections were already reported for some of these objects, such as PKS 2155-304 and Mkn421. Marginal evidence (3.1σ) for a signal is found from large-zenith-angle observations of Mkn501, corresponding to an integral flux of I(>1.65 TeV) = (1.5±0.6_stat ±0.3_syst)x 10^-12cm^-2s^-1 or ~15% of the Crab Nebula flux. Integral flux upper limits for 19 other AGN, based on exposures of ~1 to ~8 hours 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.