Tomasz Kacprzak

TL;DR: The performance of GALSIM meets the stringent requirements of high precision image analysis applications such as weak gravitational lensing, fo r current datasets and for the Stage IV dark energy surveys of the Large Synoptic Survey Telescope, ESA's Euclid mission, and NASA’s WFIRST-AFTAmission.

TL;DR: The GRavitational lEnsing Accuracy Testing 3 (GREAT3) challenge as discussed by the authors is the third in a series of image analysis challenges, with a goal of testing and facilitating the development of methods for analyzing astronomical images that will be used to measure weak gravitational lensing.

TL;DR: The recent GRavitational lEnsing Accuracy Testing (GREAT3) challenge as discussed by the authors was the third in a sequence of challenges for testing methods of inferring weak gravitational lensing shear distortions from simulated galaxy images.

TL;DR: The first blind point spread function (PSF) reconstruction challenge was held by the GRavitational lEnsing Accuracy Testing 2010 (GREAT10) Star Challenge as discussed by the authors, where participants were presented with 27,500 stars over 1300 images subdivided into 26 sets, where in each set a category change was made in the type or spatial variation of the PSF.

TL;DR: In this article, the authors derived analytical expressions for the bias of general maximum-likelihood estimators in the presence of additive noise and found that the noise bias is generically of the order of the inverse-squared signal-to-noise ratio (SNR) of the galaxies.