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Jun 23 – 28, 2014
Europe/Zurich timezone

Extended Blazar Observations by VERITAS and Implications for the Extragalactic Background Light

Jun 24, 2014, 5:10 PM
Room 3 (Tuschinski Theatre)

Room 3

Tuschinski Theatre

Presentation Gamma-Ray Astrophysics Gamma-Ray Astrophysics


Mr Yerbol Khassen (University College Dublin)


The VERITAS Collaboration has been conducting long-term observations of several TeV blazars at a variety of redshifts to characterise their temporal and spectral properties. The very high energy (VHE, >100 GeV) spectra of TeV blazars are expected to show energy-dependent absorption that increases with redshift due to the interaction of VHE photons with infra-red photons of the extragalactic background light (EBL), hence allowing insight into the intensity of the EBL. We present the VERITAS results (spectra and light curves) of eight TeV blazars: 1ES 0229+200, 1ES 0414+009, 1ES 1218+304, 1ES 1959+650, 1ES 2344+514, H 1426+428, PG 1553+113 and RGB J0710+591 along with high-energy (100 MeV - 100 GeV) archival observations by the Fermi LAT, where EBL absorption is negligible. The VHE spectra of these blazars are shown to have hard slopes despite their cosmological redshifts.

Primary author

Mr Yerbol Khassen (University College Dublin)

Presentation materials