Journal Article

Sérsiclets – a matched filter extension of Shapelets for weak lensing studies

W. Ngan, L. Van Waerbeke, A. Mahdavi, C. Heymans and H. Hoekstra

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 396, issue 2, pages 1211-1216
Published in print June 2009 | ISSN: 0035-8711
Published online June 2009 | e-ISSN: 1365-2966 | DOI:
Sérsiclets – a matched filter extension of Shapelets for weak lensing studies

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The precision study of dark matter using weak lensing by large-scale structure is strongly constrained by the accuracy with which one can measure galaxy shapes. Several methods have been devised but none has demonstrated the ability to reach the level of precision required by future weak lensing surveys. In this paper, we explore new avenues to the existing ‘Shapelets’ approach, combining a priori knowledge of the galaxy profile with the power of orthogonal basis function decomposition. This paper discusses the new issues raised by this matched filter approach and proposes promising alternatives to shape measurement techniques. In particular, it appears that the use of a matched filter (e.g. Sérsic profile) restricted to elliptical radial fitting functions resolves several well-known Shapelet issues.

Keywords: gravitational lensing; methods: numerical; techniques: image processing; dark matter

Journal Article.  3505 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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