Abstract. With the advent of the current generation of imaging atmospheric Cherenkov telescopes, active galactic nuclei (AGNs) are prime targets for observations of extragalactic sources in the very high energy (VHE; E>100GeV) domain.

In this seminar, I will present my work within the H.E.S.S. collaboration during my PhD thesis, concerning multi-wavelength (MWL) studies of AGNs and development of radiative models. A synchrotron self-Compton (SSC) model was developed specifically for misaligned blazar-like sources. Interpretation of the VHE gamma-ray emission of M 87, as well as some predictions for Cen A, will be discussed.

I will also present the recent MWL campaign of PKS 2155-304 conducted in July-August 2006, which revealed an extreme variability at VHE. A time-dependent SSC model applied to this rich data set will be discussed, as well as the recent discovery of two AGNs: RGB J0152+017 and Cen A, the latter firmly establishing radio galaxies as a new class of VHE emitters.

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