Journal
ASTROPHYSICAL JOURNAL
Volume 702, Issue 1, Pages 593-602Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/702/1/593
Keywords
cosmology: theory; dark matter; gravitational lensing; large-scale structure of universe
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Funding
- NSF [PHY-0114422, PHY-0551142, AST 0707985]
- US Department of Energy [DE-FG02-95ER40896, DE-FG02-92-ER40699]
- Initiatives in Science and Engineering Program at Columbia University
- Center for Cosmology and Astro-Particle Physics (CCAPP) at The Ohio State University
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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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