Hamburg 2016 – scientific programme

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T: Fachverband Teilchenphysik

T 18: Gammaastronomie I

T 18.6: Talk

Monday, February 29, 2016, 12:20–12:35, VMP9 SR 27

FACT -- Multivariate Extraction of Muon Ring Images — •Maximilian Nöthe, Fabian Temme, and Jens Buss for the FACT collaboration — Experimentelle Physik 5b, TU Dortmund, Dortmund

In ground-based gamma-ray astronomy, muon ring images are an important event class for instrument calibration and monitoring of its properties. In this talk, a multivariate approach will be presented, that is well suited for real time extraction of muons from data streams of Imaging Atmospheric Cherenkov Telescopes (IACT).

FACT, the First G-APD Cherenkov Telescope is located on the Canary Island of La Palma and is the first IACT to use Silicon Photomultipliers for detecting the Cherenkov photons of extensive air showers. In case of FACT, the extracted muon events are used to calculate the time resolution of the camera. In addition, the effect of the mirror alignment in May 2014 on properties of detected muons is investigated.

Muon candidates are identified with a random forest classification algorithm. The performance of the classifier is evaluated for different sets of image parameters in order to compare the gain in performance with the computational costs of their calculation.