Aachen 2019 – scientific programme

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T: Fachverband Teilchenphysik

T 87: Gamma-Astronomie II

T 87.7: Talk

Thursday, March 28, 2019, 17:35–17:50, S14

FACT - Improvement of Background Suppression — •Marvin Beck, Marc Klinger, Fabian Theißen, and Thomas Bretz for the FACT Collaboration collaboration — RWTH Aachen, Germany

Imaging Air Cherenkov Telescopes (IACTs) observe extended air showers developing in the atmosphere. The First G-APD Cherenkov Telescope (FACT), located on the Canary Island of La Palma, is dedicated to the long-term monitoring of the brightest TeV blazars and has been operational for over seven years.

The measured events are highly dominated by charged particles (protons and other atomic nuclei), leading to the need to discriminate air showers by their incident particle. The large amount of available data taken from the Crab Nebula under many different conditions, e.g. various zenith angles and ambient light levels, allows to study the performance of classical background suppression methods in depth. This study focuses on the optimization of the currently applied background suppression algorithms and the understanding of their evolution as function of observation conditions.