Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 85: Methods in astroparticle physics 4

T 85.2: Talk

Thursday, March 7, 2024, 16:15–16:30, Geb. 20.30: 2.067

Simultaneous two color intensity interferometry measurements at H.E.S.S. — •Naomi Vogel, Andreas Zmija, Gisela Anton, Stefan Funk, Alison Mitchell, and Adrian Zink — Erlangen Centre for Astroparticle Physics (ECAP), Friedrich-Alexander-Universität Erlangen-Nürnberg

Intensity interferometry (II) is a method that can achieve high angular resolution astronomical observations in the optical band by correlating photon streams from at least two telescopes with varying baselines. Imaging Atmospheric Cherenkov Telescopes are used for this technique because of their large light collection areas. Our II setup was designed to be mounted to the lid of the Phase I H.E.S.S. telescopes in Namibia. The light beam reflected from the telescope is split into two 10nm interference filters with central wavelengths at 375nm and 470nm. It is detected by photomultiplier tubes whose photo currents are transferred to our workstation via optical fibers for further analysis. Following our first measurement campaign in April 2022, we give a review and an update on the changes of the optical setup and show new results from our measurement campaign in April 2023.

Keywords: Stars; Imaging; Interferometry; Telescopes; High angular resolution