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: