Göttingen 2025 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 57: Gamma Astronomy I

T 57.6: Vortrag

Mittwoch, 2. April 2025, 17:30–17:45, VG 3.101

Enabling ground-based one giga electronvolt gamma ray astronomy — •Sebastian Achim Mueller — Max Planck Institute for Nuclear Physics, Heidelberg, Germany

Timing the variable gamma ray emission from mergers, bursts, recurring novas, flaring jets, clocking pulsars, and many more is key to constrain physical models. For good timing on account of high rates, we would ideally collect the abundant low energetic 1GeV gamma rays, for which the universe is still transparent up to high red shifts, in large areas. Satellites collect low energetic gamma rays but only in desk sized areas. Cherenkov telescopes have multi soccer field sized collecting areas but only detect the rare high energetic gamma rays above several 10GeV. We propose a ground-based instrument that detects 1GeV gamma rays in a large area and hence achieves huge gamma ray detection rates: the Cherenkov plenoscope. With a groundbreaking optics, the plenoscope enables for the first time the high-resolution imaging of low energy gamma ray air showers using a huge (71m) mirror. The plenoscope can tolerate deformations and misalignments of its mirror and camera, what reduces its cost compared to a telescope. We will introduce the plenoscope's optics and demonstrate its capabilities. By simulating a possible design we will briefly discuss the consequences for future ground based gamma ray astronomy.

Keywords: one gigaelectronvolt; gamma ray; timing; optics; atmospheric Cherenkov method