Weak Weak Lensing: How Accurately Can Small Shears be Measured?

Details Weak Weak Lensing: How Accurately Can Small Shears be Measured? Weak Weak Lensing: How Accurately Can Small Shears be Measured?

2000-07-25

arxiv.org/abs/astro-ph/0007368v1

Astronomy and Astrophysics

Astrophysics

Talk presented at Moriond 2000 ``Cosmological Physics with Gravitational Lensing''. 8 pages

Scientific paper

Now that weak lensing signals on the order of a percent are actively being searched for (cosmic shear, galaxy-galaxy lensing, large radii in clusters...) it is important to investigate how accurately weak shears can be determined. Many systematic effects are present, and need to be understood. I show that the Kaiser et al. technique can leave residual systematic errors at the percent level (through imperfect PSF anisotropy correction), and present an alternative technique which is able to recover shears a factor of ten weaker.

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