The Third Gravitational Lensing Accuracy Testing (GREAT3) Challenge Handbook
The Third Gravitational Lensing Accuracy Testing (GREAT3) Challenge Handbook
The GRavitational lEnsing Accuracy Testing 3 (GREAT3) challenge 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. This measurement requires extremely precise estimation of very small galaxy shape distortions, in the presence of far larger intrinsic galaxy shapes and distortions due to the blurring kernel caused by the atmosphere, telescope optics, and instrumental effects. The GREAT3 challenge is posed to the astronomy, machine learning, and statistics communities, and includes tests of three specific effects that are of immediate relevance to upcoming weak lensing surveys, two of which have never been tested in a community challenge before. These effects include realistically complex galaxy models based on high-resolution imaging from space; spatially varying, physically-motivated blurring kernel; and combination of multiple different exposures. To facilitate entry by people new to the field, and for use as a diagnostic tool, the simulation software for the challenge is publicly available, though the exact parameters used for the challenge are blinded. Sample scripts to analyze the challenge data using existing methods will also be provided. See http://great3challenge.info and http://great3.projects.phys.ucl.ac.uk/leaderboard/ for more information.
Claire Lackner、Reiko Nakajima、Stephen M. Kent、Chihway Chang、Rachel Mandelbaum、Alexie Leauthaud、Marc Gentile、David Kirkby、Hironao Miyatake、Arun Kannawadi、Aaron Roodman、Peter Melchior、Alden S. Jurling、Richard Massey、Frederic Courbin、Tomasz Kacprzak、Jason Rhodes、Joe Zuntz、John Peterson、J?rg P. Dietrich、Catherine Heymans、Tim Schrabback、Jean Coupon、Daniel Margala、James Bosch、Mandeep Gill、Mike Jarvis、Barnaby Rowe、Sarah Bridle、Bob Armstrong、Melanie Simet
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Claire Lackner,Reiko Nakajima,Stephen M. Kent,Chihway Chang,Rachel Mandelbaum,Alexie Leauthaud,Marc Gentile,David Kirkby,Hironao Miyatake,Arun Kannawadi,Aaron Roodman,Peter Melchior,Alden S. Jurling,Richard Massey,Frederic Courbin,Tomasz Kacprzak,Jason Rhodes,Joe Zuntz,John Peterson,J?rg P. Dietrich,Catherine Heymans,Tim Schrabback,Jean Coupon,Daniel Margala,James Bosch,Mandeep Gill,Mike Jarvis,Barnaby Rowe,Sarah Bridle,Bob Armstrong,Melanie Simet.The Third Gravitational Lensing Accuracy Testing (GREAT3) Challenge Handbook[EB/OL].(2013-08-22)[2025-05-17].https://arxiv.org/abs/1308.4982.点此复制
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