Weak Lensing Shape Measurement in CFHTLenS

Details Weak Lensing Shape Measurement in CFHTLenS Weak Lensing Shape Measurement in CFHTLenS

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21913003m&link_type=abstract

American Astronomical Society, AAS Meeting #219, #130.03

Astronomy and Astrophysics

Astronomy

Scientific paper

We describe lensfit, a bayesian fitting method, which has been used to measure weak lensing shear in the CFHT Lensing Survey (CFHTLenS). We discuss the mathematical principles of the method and the solutions to some of the issues that make shear measurement in ground-based surveys particularly challenging: the correction of complex shaped point spread functions (PSFs) that vary with position and time, the need to optimally combine multiple exposures obtained with differing PSFs, and the challenge of PSF correction on galaxies whose sizes are comparable to or smaller than that of the PSF. Lessons learned from CFHTLenS will be valuable for future large-area lensing surveys.

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