The Extragalactic Background Light and the gamma-Ray Opacity of the Local Universe

摘要

The extragalactic background light (EBL) in the UV to far-infrared wavelength region is the repository of all energy releases in the universe since the epoch of recombination.It is also a source of opacity for TeV gamma-ray sources.We briefly review the observational status of the EBL and discuss the uncertainties in its intensity at different wavelengths.The constraints on the EBL are used to place limits on the TeV opacity of the local universe.