Point spread function reconstruction for SOUL+LUCI LBT data

Matteo Simioni, Carmelo Arcidiacono, Roland Wagner, Andrea Grazian, Marco Gullieuszik, Elisa Portaluri, Benedetta Vulcani, Anita Zanella, Guido Agapito, Richard Davies, Tapio Helin, Fernando Pedichini, Roberto Piazzesi, Enrico Pinna, Ronny Ramlau, Fabio Rossi, Aleksi Salo

Submitted on 4 September 2022


This paper presents the status of an ongoing project aimed at developing a PSF reconstruction software for adaptive optics (AO) observations. In particular, we test for the first time the implementation of pyramid wave-front sensor data on our algorithms. As a first step in assessing its reliability, we applied the software to bright, on-axis, point-like sources using two independent sets of observations, acquired with the single-conjugated AO upgrade for the Large Binocular Telescope. Using only telemetry data, we reconstructed the PSF by carefully calibrating the instrument response. The accuracy of the results has been first evaluated using the classical metric: specifically, the reconstructed PSFs differ from the observed ones by less than 2% in Strehl ratio and 4.5% in full-width at half maximum. Moreover, the recovered encircled energy associated with the PSF core is accurate at 4% level in the worst case. The accuracy of the reconstructed PSFs has then been evaluated by considering an idealized scientific test-case consisting in the measurements of the morphological parameters of a compact galaxy. In the future, our project will include the analysis of anisoplanatism, low SNR regimes, and the application to multi-conjugated AO observations.


Comment: 22 pages, 8 figures. Accepted for publication in Journal of Astronomical Telescopes, Instruments, and Systems

Subject: Astrophysics - Instrumentation and Methods for Astrophysics