H.E.S.S. observations of very-high-energy emission from 1RXS J023832.6-311658

TL;DR

This paper reports the detection of very-high-energy gamma-ray emission from the blazar 1RXS J023832.6-311658 using H.E.S.S., highlighting its hard spectrum and potential for studying extragalactic magnetic fields.

Contribution

First detection of VHE gamma rays from 1RXS J023832.6-311658 with detailed spectral analysis using H.E.S.S.

Findings

Clear VHE gamma-ray excess observed

The source has a hard TeV spectrum

Potential implications for extragalactic magnetic fields

Abstract

Observations of the HBL blazar 1RXS J023832.6-311658 were made in 2013, 2015 and 2016 with the High Energy Stereoscopic System (H.E.S.S.). An excess of very high energy (VHE: > 100 GeV) gamma rays is clearly observed. The spectral energy distribution including the VHE spectrum will be presented. This object has a hard spectrum at TeV energies, and has a redshift z=0.23. These characteristics could be suitable for extragalactic magnetic fields for which the perspectives with H.E.S.S. will be discussed.