Sersiclets - a matched filter extension of Shapelets for weak lensing studies

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

Research output: Contribution to journalArticlepeer-review

Abstract

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. Sersic profile) restricted to elliptical radial fitting functions resolves several well-known Shapelet issues.

Original languageEnglish
Pages (from-to)1211-1216
Number of pages6
JournalMonthly Notices of the Royal Astronomical Society
Volume396
Issue number2
DOIs
Publication statusPublished - 21 Jun 2009

Keywords

  • gravitational lensing
  • methods: numerical
  • techniques: image processing dark matter
  • SHEARS

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