Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sf2a.conf..193s&link_type=abstract
SF2A-2006: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics Eds.: D. Barret, F. Casoli, G.
Astronomy and Astrophysics
Astrophysics
1
Scientific paper
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.
E. S. S Collaboration H.
Superina Giulia
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