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T: Fachverband Teilchenphysik

T 19: Cosmic Ray 1

T 19.5: Vortrag

Montag, 21. März 2022, 17:20–17:35, T-H32

Measurement of the Energy Spectrum of UHECRs with the Fluorescence Detector of the Pierre Auger Observatory — •Kathrin Bismark for the Pierre Auger collaboration — Karlsruher Institut für Technologie, Karlsruhe, Germany

The origin of ultrahigh-energy cosmic-rays (UHECRs) is one of the unsolved mysteries of modern-day astrophysics. The flux of UHECRs at Earth provides an important constraint on the luminosity density of their sources and the features in the UHECR energy spectrum shed light on the properties of astrophysical accelerators and on the propagation of cosmic rays through extragalactic photon fields.

Combining the measurements of the surface (SD) and fluorescence detector (FD) of the Pierre Auger Observatory allows us to determine a high resolution hybrid energy spectrum. Due to the partially redundant measurement of air showers with FD and SD, most event selection criteria and environmental influences on detection capabilities and reconstruction parameters can be investigated using measured data instead of simulations.

This presentation will focus in particular on the condition-independent visibility range of the FD, the so-called fiducial distance, given by the trigger efficiency of the FD. This trigger efficiency can be measured by determining the conditional probability to trigger a fluorescence telescope given an air shower detected by SD. The results of this study are compared to predictions from detector simulations and their impact on improvement of the precision of the measured spectrum will be discussed.