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 language | English (US) |
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Pages (from-to) | 593-602 |
Number of pages | 10 |
Journal | Astrophysical Journal |
Volume | 702 |
Issue number | 1 |
DOIs | |
State | Published - 2009 |
Externally published | Yes |
Keywords
- Cosmology: theory
- Dark matter
- Gravitational lensing
- Large-scale structure of universe
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science