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

Understand

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.