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Discovery of very high energy <i>γ</i>-ray emission from the BL Lacertae object H 2356-309 with the HESS Cherenkov telescopes
The extreme synchrotron BL Lac object H 2356-309, located at a redshift of , was observed from June to December 2004 with a total exposure of ≈40 h live-time with the HESS (High Energy Stereoscopic System) array of atmospheric-Cherenkov telescopes (ACTs). Analysis of this data set yields, for the first …