Large scale systematic signals in weak lensing surveys

Details Large scale systematic signals in weak lensing surveys Large scale systematic signals in weak lensing surveys

2004-05-13

arxiv.org/abs/astro-ph/0405268v1

Astrophys.J.613:L1,2004

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures, submitted to ApJ Letters

Scientific paper

10.1086/424873

We use numerical simulations to model the effect of seeing and extinction modulations on weak lensing surveys. We find that systematic fluctuations in the shear amplitude and source depth can give rise to changes in the $E$-mode signal and to varying amplitudes of large scale $B$-modes. Exquisite control of such systematics will be required as we approach the era of precision cosmology with weak lensing.

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