tom kitching
DESCRIPTION
Tom Kitching. Coordination Team: THOMAS KITCHING, ADAM AMARA, SARAH BRIDLE, MANDEEP GILL, CATHERINE HEYMANS, RICHARD MASSEY, BARNABY ROWE, LISA VOIGT. Advisory Team: SREE BALAN, GARY BERNSTEIN, MATTHIAS BETHGE, FREDERIC COURBIN, MARC GENTILE, STEFAN HARMELING, - PowerPoint PPT PresentationTRANSCRIPT
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Tom Kitching
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Coordination Team:THOMAS KITCHING, ADAM AMARA, SARAH BRIDLE, MANDEEP GILL, CATHERINE HEYMANS, RICHARD MASSEY, BARNABY ROWE, LISA VOIGT
Advisory Team:SREE BALAN, GARY BERNSTEIN, MATTHIAS BETHGE, FREDERIC COURBIN, MARC GENTILE, STEFAN HARMELING, ALAN HEAVENS, MICHAEL HIRSCH, RESHAD HOSSEINI, DONNACHA KIRK, KONRAD KUIJKEN, RACHEL MANDELBAUM, BABACK MOGHADDAM, GULDARIYA NURBAEVA, STEPHANE PAULIN-HENRIKSSON, ANAIS RASSAT, JASON RHODES, BERNHARD SCHOLKOPF, TIM SCHRABBACK, JOHN SHAWE-TAYLOR, MARINA SHMAKOVA, ANDY TAYLOR, MALIN VELANDER, LUDOVIC VAN WAERBEKE, DUGAN WITHERICK, DAVID WITTMAN
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The Challenge of Measuring ShapesThe Challenge of Measuring Shapes
Typical starUsed for finding Convolution kernel
Typical galaxyused for cosmicshear analysis
Slide from S. Bridle
5/19
Cosmic LensingCosmic Lensing
Real data:gi~0.03
gi~0.2
Slide from S. Bridle
6/19
Atmosphere and TelescopeAtmosphere and Telescope
Convolution with kernel
Real data: Kernel size ~ Galaxy size
Slide from S. Bridle
7/19
PixelisationPixelisation
Sum light in each square
Real data: Pixel size ~ Kernel size /2
Slide from S. Bridle
8/19
NoiseNoise
Mostly Poisson. Some Gaussian and bad pixels.Uncertainty on total light ~ 5 per cent
Slide from S. Bridle
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Need to measure shear to 10-3
Current MethodsCurrent Methods
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STEP : Shear Testing Programme STEP : Shear Testing Programme
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Heymans et al., 2006; Massey et al., 2007 & Kitching et al., 2008
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KSB
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Quality FactorQuality Factor
Kitching et al., 2008 (form filling functions); Amara & Refregier (2007)
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7 non-lensing participantsQ~1000 in some regimes
GREAT08 : Stacking Procedure is Important
GREAT08 : Stacking Procedure is Important
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Winning Methods (Q=1000) Stacked the Data
Average Data
AverageEstimators
IndividualObject
Statistic
EnsembleStatistic
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2006 2008 2010
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Massey et al. 2008 Fu et al. 2008
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Bonus Star Challenge: Reconstruct the PSF at non-star positions
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Get Ready !Get Ready !
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http://www.greatchallenges.info/http://www.greatchallenges.info/
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GREAT10 Handbook, Kitching et al., 2010
“Every time the amount of data increases by a factor of ten we should totally rethink the way we analyze it”
Jerome Freidman, Data Mining and Statistics, 1997
http://www.greatchallenges.info/http://www.greatchallenges.info/