Poster abstract details

Shear-Ratio Test - A tool against systematics (in weak gravitational lensing)
Sandra Unruh, Peter Schneider


Weak gravitational lensing describes the effect of distortions in the galaxy shapes due to the intervening matter. Since the effect is rather small, observations are dominated by systematics that we have to carefully remove. A way to check consistency is to apply null-tests to the extracted data.
We will present the shear-ratio test as such a null-test. By using ray-tracing data through the Millennium simulation, we can quantify its result. Furthermore, we introduce a way to optimize the null-test strategy.