Würzburg 2018 – scientific programme

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T: Fachverband Teilchenphysik

T 30: Gammaastronomie I

T 30.3: Talk

Tuesday, March 20, 2018, 17:05–17:20, Philo-HS7

Analysis optimisation for >10 TeV ground-based very-high-energy gamma-ray astronomy — •Iryna Lypova, Stefan Ohm, David Berge, and Stefan Klepser — DESY, Zeuthen, Germany

The High Energy Stereoscopic System (H.E.S.S.) is an array of five Cherenkov telescopes located in Namibia. H.E.S.S. operates in the broad energy range between a few 10s of GeV to more than 50 TeV. Nominal analysis methods allow for the reconstruction of events with offsets up to 2.5 degrees: the field-of-view of the H.E.S.S. cameras. Especially at >10 TeV energies, events with larger offsets trigger the telescopes. An increase in the accessible offset range would hence result in significant improvement in the instrument sensitivity, especially at energies above 10 TeV, where source studies are limited by available photon statistics. An optimisation of the reconstruction and selection tools can increase the field of view and statistics at such high energies. An improved method that is capable of reconstructing events with offsets up to 4.5 degrees will be presented in this talk.