Aachen 2019 – scientific programme

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T: Fachverband Teilchenphysik

T 60: Astroteilchenphysik: Methoden III

T 60.6: Talk

Wednesday, March 27, 2019, 17:15–17:30, S12

Improving the Direction Reconstruction for CTA — •Konstantin Pfrang — Deutsches Elektronen-Synchrotron Zeuthen

The Cherenkov Telescope Array (CTA) will be the next generation Imaging Air Cherenkov Telescope array (IACT) for gamma-ray astronomy, with more than 100 telescopes located at two sites in the southern and northern hemispheres. The accurate reconstruction of the initial gamma-ray direction is a crucial factor for the IACT performance. In the CTA calibration and low-level data analysis framework ctapipe a geometrical direction reconstruction based on the Hillas parameterization of the images is applied. CTA will be the first IACT using such a large number of telescopes and consequently it will record many images of the same air shower. However, their quality is not uniform and giving more importance to appropriate images will improve the performance of the reconstruction.
In this work, the importance of the individual images for the direction reconstruction for simulations of CTA south in ctapipe is investigated and the weighting is reviewed. The influence is estimated using look-up tables for the distance of closest approach between the semi-major axis of the parameterized image to the true direction in the camera. This weighting of the images improves the reconstruction for point source and diffuse simulations over the default weights calculated from an analytic expression.