Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-02-20
29th International Cosmic Ray Conference (ICRC 2005) (2005) 287-290
Astronomy and Astrophysics
Astrophysics
To appear on proceeding of 29th International Cosmic Ray Conference (ICRC 2005)
Scientific paper
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$\sigma$ (standard deviations) .
Benbow Wystan
Costamante Luigi
Djannati-Ataï Arache
Horns Dieter
Ouchrif M.
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