Weak Lensing Galaxy Shear Extraction Testing for LSST

Details Weak Lensing Galaxy Shear Extraction Testing for LSST Weak Lensing Galaxy Shear Extraction Testing for LSST

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21725224j&link_type=abstract

American Astronomical Society, AAS Meeting #217, #252.24; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

The accuracy and reliability of weak-lensing measurement for LSST depend on the level of the atmospheric turbulence of the site, the integrity of the design and fabrication of the optical system, the ability to describe and model both the atmospheric and instrumental characteristics, and the accuracy of the algorithm to remove these systematics and extract gravitational shears of galaxies. Of course, at the core of this removal of the systematics is the high-fidelity modeling and correction of the point spread function (PSF) on the delivered images.
In this poster, we present the results of our on-going end-to-end shear extraction simulation efforts to investigate the impacts of the above factors on lensing signal measurement. First, we review our past accomplishments on the issue of accurate description and removal of the PSF effects using a principal component analysis method. Then, we present the results of our current shear extraction simulation using artificially sheared galaxy images. Finally, we discuss some key issues that need to be addressed in order to meet the requirement of the LSST weak-lensing science.

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