Discovery of VHE and HE emission from the blazar 1ES 0414+009 with H.E.S.S and Fermi-LAT

TL;DR

This paper reports the detection of very high-energy and high-energy gamma-ray emission from the distant blazar 1ES 0414+009 using H.E.S.S. and Fermi-LAT, revealing a very high Compton peak above a few TeV.

Contribution

First combined analysis of VHE and HE gamma-ray emission from 1ES 0414+009, demonstrating a peak above a few TeV after EBL correction.

Findings

Detection of VHE emission with H.E.S.S.

Detection of HE emission with Fermi-LAT

Identification of a high-energy Compton peak above a few TeV

Abstract

The high energy peaked BL Lac (HBL) object 1ES 0414+009 (z=0.287) is a distant very high-energy (VHE, E > 100 GeV) blazars with well-determined redshift. This source was detected with the High Energy Stereoscopic System (H.E.S.S.) between October 2005 and September 2009. It was also detected with the Fermi Large Area Telescope (LAT) in 21 months of data. The combined high energy (HE) and VHE spectra, once corrected for gamma-gamma absorption on the extragalactic background light (EBL), indicate a Compton peak located above few TeV, among the highest in the BL Lac class.