Lensing bias in cosmic shear

Fabian Schmidt, Eduardo Rozo, Scott Dodelson, Lam Hui, Erin Sheldon

Research output: Contribution to journalArticlepeer-review

44 Scopus citations

Abstract

Only galaxies bright enough and large enough to be unambiguously identified and measured are included in galaxy surveys used to estimate cosmic shear. We demonstrate that because gravitational lensing can scatter galaxies across the brightness and size thresholds, cosmic shear experiments suffer from lensing bias. We calculate the effect on the shear power spectrum and show that - unless corrected for - it will lead analysts to cosmological parameters estimates that are biased at the 2-3σ level in DETF Stage III experiments, such as the Dark Energy Survey.

Original languageEnglish (US)
Pages (from-to)593-602
Number of pages10
JournalAstrophysical Journal
Volume702
Issue number1
DOIs
StatePublished - 2009

Keywords

  • Cosmology: theory
  • Dark matter
  • Gravitational lensing
  • Large-scale structure of universe

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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