The Extragalactic sky with the High Energy Stereoscopic System

TL;DR

This paper reviews the recent progress in studying extragalactic sources at very high energies using H.E.S.S., highlighting new discoveries, extended energy coverage, and combined data with Fermi-LAT for detailed spectral analysis.

Contribution

It presents new results from H.E.S.S. phase II, extending the energy range down to ~30 GeV and combining data with Fermi-LAT for comprehensive spectral studies.

Findings

Over fifty extragalactic VHE sources detected

H.E.S.S. energy range extended to ~30 GeV with phase II

Combined H.E.S.S. and Fermi-LAT data enables detailed spectral analysis

Abstract

The number of extragalactic sources detected at very hight energy (VHE, E$>$100GeV) has dramatically increased during the past years to reach more than fifty. The High Energy Stereoscopic System (H.E.S.S.) had observed the sky for more than 10 years now and discovered about twenty objects. With the advent of the fifth 28 meters telescope, the H.E.S.S. energy range extends down to ~30 GeV. When H.E.S.S. data are combined with the data of the Fermi Large area Telescope, the covered energy range is of several decades allowing an unprecedented description of the spectrum of extragalactic objects. In this talk, a review of the extragalactic sources studied with H.E.S.S. will be given together with first H.E.S.S. phase II results on extragalactic sources.