27-31 August 2018
LVH, Luisenstraße 58, 10117 Berlin
Europe/Berlin timezone
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Contribution Poster (A0 portrait)

LVH, Luisenstraße 58, 10117 Berlin -

Energy dependent time lag search in blazar emissions with H.E.S.S.


  • Mr. Cédric PERENNES

Primary authors


Abstract content

In the past 15 years, Cherenkov Telescopes have detected various minute-scale flares of AGNs in the energy range above 100 GeV. This important sample allows for measurements of corresponding light curves and energy spectra leading to a precise determination of possible photon energy dependent time delays.

Analyses were performed in order to study possible effects of these distant and variable sources on the emission of photons. Notably, the search for energy-dependent time-lags allows for constraining astrophysical models and also greatly contributes to fundamental physics such as searches for a possible violation of the Lorentz Invariance.

In the proposed presentation, both physical topics will be addressed while focusing on the time-lag measurements in AGN flares detected by the H.E.S.S. experiment. Methods to measure time lag will be presented, as well as the preliminary analysis of a flare observed by H.E.S.S.