Lensing Bias in Cosmic Shear

Details Lensing Bias in Cosmic Shear Lensing Bias in Cosmic Shear

2009-04-29

arxiv.org/abs/0904.4703v3

Astrophys.J.702:593-602,2009

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

14 pages; 4 figures (this version). Accepted for publication in ApJ. v2: incorporating referee's comments; v3: updated acknowl

Scientific paper

10.1088/0004-637X/702/1/593

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 2-3\sigma level in DETF Stage III experiments, such as the Dark Energy Survey.

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