Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-12-23
Astrophys.SpaceSci.309:487-495,2007
Astronomy and Astrophysics
Astrophysics
6 pages, 9 figures, 1 table. Proceedings of the conference "The Multi-Messenger Approach to High-Energy Gamma-ray Sources", Ba
Scientific paper
10.1007/s10509-007-9418-7
The unexpectedly hard spectra measured by HESS for the BLLacs 1ES 1101-232 and H 2356-309 has allowed an upper limit on the Extragalactic Background Light (EBL) to be derived in the optical/near-infrared range, which is very close to the lower limit given by the resolved galaxy counts. This result seems to exclude a large contribution to the EBL from other sources (e.g. Population III stars) and indicates that the intergalactic space is more transparent to gamma-rays than previously thought. A brief discussion of EBL absorption effects on blazar spectra and further observational tests to check this conclusion are presented, including the selection of new candidates for observations with Cherenkov telescopes.
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