July 29, 2015 to August 6, 2015
World Forum
Europe/Amsterdam timezone

Update on the determination of the extragalactic background light spectral energy distribution with H.E.S.S.

Aug 5, 2015, 11:30 AM
World Forum Theater (World Forum)

World Forum Theater

World Forum

Churchillplein 10 2517 JW Den Haag The Netherlands
Oral contribution GA-EX Parallel GA18 EGAL


Matthias Lorentz (IRFU CEA Saclay)


When very high-energy photons (VHE, E>100 GeV) travel over cosmological distances, they interact with background light by pair production. In the Earth reference frame it turns out the threshold of the reaction with photons from IR to UV falls in the energy range where the H.E.S.S. array of Cherenkov telescopes is the most sensitive. Observations of spectral features in the VHE band of extragalactic sources related to this energy-dependent process allow measuring the spectral energy distribution (SED) of the extragalactic background light (EBL), otherwise very difficult to determine. We will present an update of the estimation of the SED of the EBL based on the measurements of the energy spectra of blazars with H.E.S.S. at redshifts up to z=0.2.
Collaboration H.E.S.S.
Registration number following "ICRC2015-I/" 554

Primary author

Matthias Lorentz (IRFU CEA Saclay)


Andrew Chen (University of the Witwatersrand) David Sanchez (LAPP) Pierre Brun (CEA Saclay)

Presentation materials