Weak Lensing Shape Measurement With Multi-Scale Shapelets

Details Weak Lensing Shape Measurement With Multi-Scale Shapelets Weak Lensing Shape Measurement With Multi-Scale Shapelets

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21346709b&link_type=abstract

American Astronomical Society, AAS Meeting #213, #467.09; Bulletin of the American Astronomical Society, Vol. 41, p.415

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Scientific paper

Many current and proposed weak gravitational lensing experiments are limited in the accuracy with which they can map out large-scale cosmic structure by challenges involved in measuring the ellipticities of galaxies. Many proposed techniques utilize shapelets (Gauss-Laguerre or Gauss-Hermite functions), an orthogonal basis set with many useful mathematical properties. Others have emphasized the value of a model-fitting approach to shape measurement, and note that shapelets are poorly matched to empirical (Sersic) galaxy models. We describe here a new technique in which we construct "optimally" realistic galaxy models using shapelets as building blocks, enabling shape measurement methods that can take advantage of the best features of both shapelet and model-fitting methods.

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