2010MNRAS.405.2044B

Query : 2010MNRAS.405.2044B

2010MNRAS.405.2044B - Mon. Not. R. Astron. Soc., 405, 2044-2061 (2010/July-1)

Results of the GREAT08 challenge: an image analysis competition for cosmological lensing.

BRIDLE S., BALAN S.T., BETHGE M., GENTILE M., HARMELING S., HEYMANS C., HIRSCH M., HOSSEINI R., JARVIS M., KIRK D., KITCHING T., KUIJKEN K., LEWIS A., PAULIN-HENRIKSSON S., SCHOELKOPF B., VELANDER M., VOIGT L., WITHERICK D., AMARA A., BERNSTEIN G., COURBIN F., GILL M., HEAVENS A., MANDELBAUM R., MASSEY R., MOGHADDAM B., RASSAT A., REFREGIER A., RHODES J., SCHRABBACK T., SHAWE-TAYLOR J., SHMAKOVA M., VAN WAERBEKE L. and WITTMAN D.

Abstract (from CDS):

We present the results of the Gravitational LEnsing Accuracy Testing 2008 (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 sophisticated in future GREAT Challenges, meanwhile the GREAT08 simulations remain as a benchmark for additional developments in shear measurement algorithms.

Abstract Copyright: © 2010 The Authors. Journal compilation © 2010 RAS. Re-use of this article is permitted in accordance with the Terms and Conditions set out at http://www3.interscience.wiley.com/authorresources/onlineopen.html

Journal keyword(s): gravitational lensing: weak - methods: data analysis - methods: statistical - techniques: image processing - cosmology: observations - large-scale structure of Universe

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME Hubble Deep Field reg 12 36 49.5 +62 12 58           ~ 1967 1

Query : 2010MNRAS.405.2044B

Basic data :
NAME Hubble Deep Field -- Region defined in the Sky
Other object types: otypes_help 		reg ()
ICRS coord. (ep=J2000) : 		12 36 49.5 +62 12 58 [ ] D ~
FK4 coord. (ep=B1950 eq=1950) : 		12 34 35.5 +62 29 28 [ ]
Gal coord. (ep=J2000) : 		125.8875 +54.8282 [ ]
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NAME HDF NAME HDFN NAME Hubble Deep Field NAME Northern Hubble Deep Field
NAME HDF-N NAME NHDF NAME Hubble Deep Field North

References (1967 between 1850 and 2026) (Total 1967)
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