Discovery of Very High Energy gamma-ray emission from the extreme BL Lac Object 
H2356-309 with H.E.S.S.

Pita, S.; Benbow, W.; Costamante, L.; Djannatai-Atai, A.; Horns, D.; Ouchrif, M.; Tluczykont, M.; S. Pita for the H.E.S.S. Collaboration

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Discovery of Very High Energy gamma-ray emission from the extreme BL Lac Object H2356-309 with H.E.S.S.

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

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Costamante, L.
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Horns, D.
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Citation

Pita, S., Benbow, W., Costamante, L., Djannatai-Atai, A., Horns, D., Ouchrif, M., et al. (2005). Discovery of Very High Energy gamma-ray emission from the extreme BL Lac Object H2356-309 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. 287-290). Navy Nagar, Colaba, Mumbai, MH-400005: Tata Institute of Fundamental Research.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0011-87AD-6

Abstract

The understanding of acceleration mechanisms in active galactic nuclei (AGN) jets and the measurement of the extragalactic-background-light (EBL) density are closely linked and require the detection of a large sample of very-high-energy (VHE) emitting extragalactic objects at varying redshifts. We report here on the discovery with the H.E.S.S. (High Energy Stereoscopic System) atmospheric-Cherenkov telescopes of the VHE gamma-ray emission from H2356-309, an extreme BL Lac object located at a redshift of 0.165. The observations of this object, which was previously proposed as a southern-hemisphere VHE candidate source, were performed between June and December 2004. The total exposure is 38.9 hours live time, after data quality selection, which yields the detection of a signal at the level of 9.0 σ (standard deviations).