HEGS : Revisiting a decade of H.E.S.S. extragalactic observations

TL;DR

This paper re-analyzes over 2700 hours of H.E.S.S. extragalactic observations from 2004-2012, producing a catalog of 23 sources and insights into variability, background light, and comparisons with Fermi-LAT data.

Contribution

It provides a comprehensive, consistent re-analysis of a decade of H.E.S.S. extragalactic data, resulting in new catalogs and multi-faceted astrophysical insights.

Findings

Catalog of 23 extragalactic gamma-ray sources

Insights into source variability and background light

Comparison with Fermi-LAT data

Abstract

During its first phase, from 2004 up to the end of 2012, the H.E.S.S. (High Energy Stereoscopic System) experiment observed the extragalactic skies for more than 2700 hours. These data have been re-analysed in a single consistent framework, leading to the derivation of a catalog of 23 sources. In total, about 5.7% of the sky was observed, allowing for several additional studies to be conducted: source variability, extragalactic gamma-ray background light, and comparison with the Fermi-LAT catalogues. In this contribution, we discuss these results and present the high-level data (catalogs, maps) released to the astrophysical community.