The systematic error test for PSF correction in weak gravitational lensing shear measurement by the ERA method by idealizing PSF

Yuki Okura, Toshifumi Futamase

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We improve the ellipticity of re-smeared artificial image (ERA) method of point-spread function (PSF) correction in a weak lensing shear analysis in order to treat the realistic shape of galaxies and the PSF. This is done by re-smearing the PSF and the observed galaxy image using a re-smearing function (RSF) and allows us to use a new PSF with a simple shape and to correct the PSF effect without any approximations or assumptions. We perform a numerical test to show that the method applied for galaxies and PSF with some complicated shapes can correct the PSF effect with a systematic error of less than 0.1%. We also apply the ERA method for real data of the Abell 1689 cluster to confirm that it is able to detect the systematic weak lensing shear pattern. The ERA method requires less than 0.1 or 1 s to correct the PSF for each object in a numerical test and a real data analysis, respectively.

Original languageEnglish
Article number138
JournalAstrophysical Journal
Volume827
Issue number2
DOIs
Publication statusPublished - 2016 Aug 20

Keywords

  • gravitational lensing: weak

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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