English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

X-ray selected BL Lac objects dominate the population of extragalacticsources detected in the very high energy (VHE; photon energies >100GeV)gamma-ray regime with ground-based Cherenkov Telescopes. These are not the onlyextragalactic VHE emitters, however, since also other types of active galacticnuclei (AGN) have recently been established as VHE sources as well. Theyinclude radio galaxies, optically-selected BL Lacs, and Flat-Spectrum RadioQuasars. Here we review the current status of the ongoing AGN studies with theH.E.S.S. instrument, concentrating on the following main three topics: (i)constraints on the structure of the blazar emitting zone, and on the energydissipation processes involved in the production of the high-energy emission inAGN, enabled by detailed timing and spectral analysis of the H.E.S.S. data;(ii) constraints on the extragalactic background light (EBL) using H.E.S.S.observations of blazars, and (iii) the phenomenological picture of thegamma-ray loud AGN population emerging from combined VHE and multi-wavelengthobservations of different classes of active galaxies.

Active Galaxies Studied with the H.E.S.S. Observatory