MegaLUT: Correcting ellipticity measurements of galaxies

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MegaLUT: Correcting ellipticity measurements of galaxies

Post by owlice » Fri Mar 30, 2012 4:44 am

[c]MegaLUT: Correcting ellipticity measurements of galaxies[/c][/b]
Abstract: MegaLUT is a simple and fast method to correct ellipticity measurements of galaxies from the distortion by the instrumental and atmospheric point spread function (PSF), in view of weak lensing shear measurements. The method performs a classification of galaxies and associated PSFs according to measured shape parameters, and builds a lookup table of ellipticity corrections by supervised learning. This new method has been applied to the GREAT10 image analysis challenge, and demonstrates a refined solution that obtains the highly competitive quality factor of Q = 142, without any power spectrum denoising or training. Of particular interest is the efficiency of the method, with a processing time below 3 ms per galaxy on an ordinary CPU.

Credit: Tewes, Malte; Cantale, Nicolas; Courbin, Frédéric; Kitching, Thomas; Meylan, Georges

Site: ... e/megalut/

Bibcode: 2012ascl.soft03008T

ID: ascl:1203.008
Last edited by Ada Coda on Sun Jul 14, 2019 8:19 pm, edited 1 time in total.
Reason: Updated code entry.
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