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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.

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.

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Item Permalink: https://hdl.handle.net/11858/00-001M-0000-0011-87AD-6 Version Permalink: https://hdl.handle.net/11858/00-001M-0000-0011-87AE-4
Genre: Conference Paper

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 Creators:
Pita, S.1, Author
Benbow, W.2, Author           
Costamante, L.2, Author           
Djannatai-Atai, A.1, Author
Horns, D.2, Author           
Ouchrif, M.1, Author
Tluczykont, M.1, Author
S. Pita for the H.E.S.S. Collaboration, Editor  
Affiliations:
1APC (Astroparticule et Cosmologie), CNRS, Universit´e Paris VII, CEA, Observatoire de Paris, Paris, France Institute for Astronomy and Astrophysics, Tuebingen, Germany Laboratoire de Physique Nucléaire et Physique des Particules, IN2P3/CNRS, Universités Paris VI&VII,Paris, France Laboratoire Leprince-Ringuet, IN2P3/CNRS, Ecole Polytechnique, Palaiseau, France, ou_persistent22              
2Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society, ou_904550              

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 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).

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Language(s): eng - English
 Dates: 2005-12
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: eDoc: 282110
 Degree: -

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Title: 29th International Cosmic Ray Conference
Place of Event: Pune, India
Start-/End Date: 2005-08-03 - 2005-08-10

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Title: Proceedings of the 29th International Cosmic Ray Conference
Source Genre: Proceedings
 Creator(s):
Acharya, B. Sripathi, Editor
Gupta, Sunil, Editor
Jagadeesan, P., Editor
Jain, Atul, Editor
Karthikeyan, S., Editor
Morris, Samuel, Editor
Tonwar, Suresh, Editor
Affiliations:
-
Publ. Info: Navy Nagar, Colaba, Mumbai, MH-400005 : Tata Institute of Fundamental Research
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: 287 - 290 Identifier: -