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The Third Gravitational Lensing Accuracy Testing (GREAT3) Challenge Handbook

Mandelbaum, Rachel and Rhodes, Jason (2014) The Third Gravitational Lensing Accuracy Testing (GREAT3) Challenge Handbook. Astrophysical Journal Supplement Series, 212 (1). Art. No. 5. ISSN 0067-0049. doi:10.1088/0067-0049/212/1/5.

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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 many novel aspects including realistically complex galaxy models based on high-resolution imaging from space; a spatially varying, physically motivated blurring kernel; and a 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 and for more information.

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Mandelbaum, Rachel0000-0003-2271-1527
Additional Information:© 2014 American Astronomical Society. Received 2013 August 29; accepted 2014 March 22; published 2014 April 17. The authors of this work benefited greatly from discussions with Christopher Hirata, Gary Bernstein, Lance Miller, and Erin Sheldon; the WFIRST project office, including David Content; the Euclid Consortium; and the LSST imSim team, including En-Hsin Peng; and Peter Freeman. We thank the PASCAL-2 network for its sponsorship of the challenge. This work was supported in part by the National Science Foundation under grant No. PHYS-1066293 and the hospitality of the Aspen Center for Physics. This project was supported in part by NASA via the Strategic University Research Partnership (SURP) Program of the Jet Propulsion Laboratory, California Institute of Technology; and by the IST Programme of the European Community, under the PASCAL2 Network of Excellence, IST-2007-216886. This article only reflects the authors’ views. R.M. was supported in part by program HST-AR-12857.01- A, provided by NASA through a grant from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Incorporated, under NASA contractNAS5-26555. B.R. and S.B. acknowledge support from the European Research Council in the form of a Starting Grant with number 240672. H.M. acknowledges support from JSPS Postdoctoral Fellowships for Research Abroad. C.H. acknowledges support from the European Research Council under the EC FP7 grant number 240185. F.C. and M.G. are supported by the Swiss National Science Foundation (SNSF). Center for Particle Astrophysics, Fermi National Accelerator Laboratory is operated by Fermi Research Alliance, LLC under contract No. De-AC02-07CH11359 with the United States Department of Energy.
Funding AgencyGrant Number
Aspen Center for PhysicsUNSPECIFIED
NASA Strategic University Research Partnership (SURP) ProgramUNSPECIFIED
European Community IST Programme PASCAL2 Network of ExcellenceIST-2007-216886
NASA Space Telescope Science InstituteHST-AR-12857.01- A
European Research Council Starting Grant240672
Japan Society for the Promotion of Science (JSPS)UNSPECIFIED
European Research Council EC FP7240185
Swiss National Science Foundation (SNSF)UNSPECIFIED
Department of Energy (DOE)DE-AC02-07CH11359
Subject Keywords:gravitational lensing: weak; methods: data analysis; methods: statistical; techniques: image processing
Issue or Number:1
Record Number:CaltechAUTHORS:20140821-091048437
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Official Citation:The Third Gravitational Lensing Accuracy Testing (GREAT3) Challenge Handbook Rachel Mandelbaum et al. 2014 ApJS 212 5
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48765
Deposited On:21 Aug 2014 17:15
Last Modified:10 Nov 2021 18:35

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