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OWLS Pipeline Status Report

OWLS Pipeline Status Report. STEP 2007 Workshop, JPL Mon, Aug 20, 2007 MSSG, J.Young, P. Martini, K. Honscheid, D. Weinberg, C. Kochanek + OWLS Team ( OWLS = OSU Weak Lensing Survey). Outline. Description of hybrid approach Our current results from deconvolving

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OWLS Pipeline Status Report

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  1. OWLS Pipeline Status Report STEP 2007 Workshop, JPL Mon, Aug 20, 2007 MSSG, J.Young, P. Martini, K. Honscheid, D. Weinberg, C. Kochanek + OWLS Team ( OWLS = OSU Weak Lensing Survey)

  2. Outline • Description of hybrid approach • Our current results from deconvolving • Cuts on various sextractor quantities and their effects • Plans: KSB, Subaru images, LBT images

  3. ‘Hybrid’ Approach • Seems slightly unorthodox, but we do it in 2 steps: • For sextractor, we need to make pstamp recompositions of each object from shapelets • Then separately sextract them • We should be able to get this from shapelets coefficients also, working on this… • Deconvolve using shapelets • Extract ellipticity averages using sextractor

  4. Deconvolving with Extracted PSF • We used the starfield for the psfs • Extract psf in same way we would for cluster: pick stars, make decomp, fix beta and nmax, decomp again • Constant psf *not* assumed • We then deconvolved the galaxy field with this psf

  5. Example of Deconvolved Galaxy (psfD, file shear20, object #1)

  6. Our Current Results Average of PSF’s A,D,E, Squares = rotation-matched, triangles = original only ; red square = our result

  7. Plans • Fits with errors – will implement bootstrap • Next: go to Subaru A1689 images • Then to LBT images – have 2 clusters in hand • Abell 611:

  8. BACKUP Slides • .

  9. Results with Known PSF • We used PSFs sent to us by J. Berge’ • Plot of rotation-matched averaged c, m for ADE compared to paper, Red = ours

  10. Cut effects on results Made cuts on several quantities (sexarea, sexflux, a*b, shapelets error) and saw results improve • Example: change in m as function of shapelets error cut:

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