The Extragalactic Background Light: Constraints from TeV Blazar Observations
2017 October 23
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Ground-based imaging atmospheric-Cherenkov telescope arrays such as VERITAS, H.E.S.S. and MAGIC have collected deep exposures on hard-spectrum blazars located at a range of redshifts, in addition to shorter exposures during periods of high source activity. These datasets can be used to characterize the intensity spectrum of the extragalactic background light (EBL), as interactions of $\gamma$-rays emitted by the sources with EBL photons impact the observed photon spectra of distant blazars. We present an overview of EBL constraints and measurements derived from observations made by these instruments.