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Discovery of Very High Energy gamma-ray emission from the distant BL Lac object H2356-309 with the H.E.S.S. Cherenkov Telescopes

Abstract : The H.E.S.S.(High Energy Stereoscopic System) array of imaging Cherenkov telescopes has recently discovered the most distant extra-galactic Very High Energy (VHE, E>160GeV) gamma-ray emitters. Located at a redshift of z=0.165, the extreme synchrotron BL Lac object H2356-309 was observed with H.E.S.S. in a simultaneous multi-wavelength campaign including radio, optical and X-ray observatories. Using a single zone model, we will describe the constraints on VHE emission parameters such as the maximal Lorentz factors of accelerated electrons, and the magnetic field. We will also show the constraints that this source, as well as the other VHE gamma-ray emitter 1ES1101-232, puts on the density of extragalactic background light, which is an important cosmological topic.
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G. Superina. Discovery of Very High Energy gamma-ray emission from the distant BL Lac object H2356-309 with the H.E.S.S. Cherenkov Telescopes. SF2A-2006: 26ème Semaine de l'Astrophysique Française, Jun 2006, Paris, France. pp.193-196. ⟨in2p3-00135987⟩

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