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New Distant TeV Blazars: Pushing the VHE gamma-ray Horizon

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Raue,  Martin
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Citation

Raue, M. (2007). New Distant TeV Blazars: Pushing the VHE gamma-ray Horizon. Talk presented at HEPRO workshop. Dublin, Ireland. 2007-09-24 - 2007-09-28.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0011-7C25-7
Abstract
The discovery of several distant TeV blazars (redshift up to z~0.2 and possibly z~0.5) with the new generation Cherenkov telescopes HESS and MAGIC enables to set strong limits on the extragalactic background light (EBL) in the near to mid-infrared region. These upper limits are only a factor of two to three higher than the lower limits derived from source counts and several theoretical models could already be excluded. Such a low level of the EBL implies that the universe is much more transparent to VHE gamma-rays than previously anticipated. Here we summarize the recent results and discuss future prospects.