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HANDBOOK FOR THE GREAT08 CHALLENGE: AN IMAGE ANALYSIS COMPETITION FOR COSMOLOGICAL LENSING

Bridle, S; Shawe-Taylor, J; Amara, A; Applegate, D; Balan, ST; Berge, J; ... Wittman, D; + view all (2009) HANDBOOK FOR THE GREAT08 CHALLENGE: AN IMAGE ANALYSIS COMPETITION FOR COSMOLOGICAL LENSING. ANN APPL STAT , 3 (1) 6 - 37. 10.1214/08-AOAS222.

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Abstract

The GRavitational lEnsing Accuracy Testing 2008 (GREAT08) Challenge focuses on a problem that is of crucial importance for future observations in cosmology. The shapes of distant galaxies can be used to determine the properties of dark energy and the nature of gravity, because light from those galaxies is bent by gravity from the intervening dark matter. The observed galaxy images appear distorted, although only slightly, and their shapes must be precisely disentangled from the effects of pixelisation, convolution and noise. The worldwide gravitational lensing community has made significant progress in techniques to measure these distortions via the Shear TEsting Program (STEP). Via STEP, we have run challenges within our own community, and come to recognise that this particular image analysis problem is ideally matched to experts in statistical inference, inverse problems and computational learning. Thus, in order to continue the progress seen in recent years, we are seeking an infusion of new ideas from these communities. This document details the GREAT08 Challenge for potential participants. Please visit www.great08challenge.info for the latest information.

Type:Article
Title:HANDBOOK FOR THE GREAT08 CHALLENGE: AN IMAGE ANALYSIS COMPETITION FOR COSMOLOGICAL LENSING
DOI:10.1214/08-AOAS222
Keywords:Inference, inverse problems, astronomy, WEAK GRAVITATIONAL SHEAR, LARGE-SCALE STRUCTURE, NONLINEAR CLUSTER INVERSION, GALAXY SHAPE MEASUREMENT, DARK-MATTER, SYSTEMATIC-ERRORS, POLAR SHAPELETS, COSMIC SHEAR, DISTORTIONS, CALIBRATION
UCL classification:UCL > Professional Services > Information Services Division > Research IT Services > Research Data Services
UCL > School of BEAMS > Faculty of Engineering Science > Computer Science
UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Physics and Astronomy
UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Space and Climate Physics

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