CosmoStat Seminar: Dr. Lin Nie

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Date & Time: 30 May 2024, 10h

Venue: Salle Kepler/Zoom, Bâtiment 709

Title: Advancements in Point Spread function reconstruction for weak lensing studies

Accurate modeling of the Point Spread Function (PSF) holds paramount importance in the field of weak lensing, where precise galaxy shape measurements relies on the reliability of the PSF model. A critical initial step in acquiring a precise PSF model for galaxies involves the reconstruction of the PSF from observed star images. In this talk, I will present our recent work on PSF reconstructions by using Smooth-PCA method, which can reconstruct smooth PSFs efficiently.  And then, I will talk about HybPSF, a hybrid PSF construction method for JWST NIRCam imaging data that combines the WebbPSF software with observed data to produce more accurate and reliable PSF models than WebbPSF.

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Author: Ezequiel Centofanti

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