Journal
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
Volume 212, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0067-0049/212/1/5
Keywords
gravitational lensing: weak; methods: data analysis; methods: statistical; techniques: image processing
Categories
Funding
- National Science Foundation [PHYS-1066293]
- NASA via the Strategic University Research Partnership (SURP) Program of the Jet Propulsion Laboratory, California Institute of Technology
- IST Programme of the European Community under the PASCAL2 Network of Excellence [IST-2007-216886]
- NASA through Space Telescope Science Institute
- NASA [NAS5-26555]
- European Research Council [240672, 240185]
- JSPS Postdoctoral Fellowships for Research Abroad
- Swiss National Science Foundation (SNSF)
- LLC [De-AC02-07CH11359]
- United States Department of Energy
- [HST-AR-12857.01-A]
- STFC [ST/I001573/1, ST/F002300/1, ST/L000768/1, ST/I001166/1, ST/I00162X/1, ST/H008519/1, ST/L00075X/1, ST/F002289/1, ST/H002022/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/F002300/1, ST/L00075X/1, ST/L000768/1, ST/F002289/1, ST/I00162X/1, ST/H008519/1, ST/H002022/1, ST/I001166/1, ST/I001573/1] Funding Source: researchfish
- Grants-in-Aid for Scientific Research [14J11501] Funding Source: KAKEN
Ask authors/readers for more resources
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.
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