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  Results of the GREAT08 Challenge: An image analysis competition for cosmological lensing

Bridle, S., Balan, S., Bethge, M., Gentile, M., Harmeling, S., Heymans, C., et al. (2010). Results of the GREAT08 Challenge: An image analysis competition for cosmological lensing. Monthly Notices of the Royal Astronomical Society, 405(3), 2044-2061. doi:10.1111/j.1365-2966.2010.16598.x.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-BF2C-C Version Permalink: http://hdl.handle.net/21.11116/0000-0002-7578-4
Genre: Journal Article

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 Creators:
Bridle, S, Author
Balan, ST, Author
Bethge, M1, 2, Author              
Gentile, M, Author
Harmeling, S2, 3, Author              
Heymans, C, Author
Hirsch, M2, 3, Author              
Hosseini, R1, 2, Author              
Jarvis, M, Author
Kirk, D, Author
Kitching, T, Author
Kuijken, K, Author
Lewis, A, Author
Paulin-Henriksson, S, Author
Schölkopf, B2, 3, Author              
Velander, M, Author
Voigt, L, Author
Witherick, D, Author
Amara, A, Author
Bernstein, G, Author
Courbin, F, AuthorGill, M, AuthorHeavens, A, AuthorMandelbaum, R, AuthorMassey, R, AuthorMoghaddam, B, AuthorRassat, A, AuthorRefregier, A, AuthorRhodes, J, AuthorSchrabback, T, AuthorShaw-Taylor, J, AuthorShmakova, M, Authorvan Waerbeke, L, AuthorWittman, D, Author more..
Affiliations:
1Research Group Computational Vision and Neuroscience, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497805              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497794              
3Department Empirical Inference, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497795              

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 Abstract: We present the results of the GREAT08 Challenge, a blind analysis challenge to infer weak gravitational lensing shear distortions from images. The primary goal was to stimulate new ideas by presenting the problem to researchers outside the shear measurement community. Six GREAT08 Team methods were presented at the launch of the Challenge and five additional groups submitted results during the 6 month competition. Participants analyzed 30 million simulated galaxies with a range in signal to noise ratio, point-spread function ellipticity, galaxy size, and galaxy type. The large quantity of simulations allowed shear measurement methods to be assessed at a level of accuracy suitable for currently planned future cosmic shear observations for the first time. Different methods perform well in different parts of simulation parameter space and come close to the target level of accuracy in several of these. A number of fresh ideas have emerged as a result of the Challenge including a re-examination of the process of combining information from different galaxies, which reduces the dependence on realistic galaxy modelling. The image simulations will become increasingly sophis- ticated in future GREAT challenges, meanwhile the GREAT08 simulations remain as a benchmark for additional developments in shear measurement algorithms.

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 Dates: 2010-07
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1111/j.1365-2966.2010.16598.x
BibTex Citekey: 6340
 Degree: -

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Title: Monthly Notices of the Royal Astronomical Society
  Other : Mon. Not. R. Astron. Soc.
Source Genre: Journal
 Creator(s):
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Publ. Info: Oxford : Oxford University Press
Pages: - Volume / Issue: 405 (3) Sequence Number: - Start / End Page: 2044 - 2061 Identifier: ISSN: 1365-8711
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000024150