Effect of Mask Regions on Weak Lensing Statistics

Understand

Sky masking is unavoidable in wide-field weak lensing observations.

• We study how masks affect the measurement of statistics of matter distribution probed by weak gravitational lensing.
• We first use 1000 cosmological ray-tracing simulations to examine in detail the impact of masked regions on the weak lensing Minkowski Functionals (MFs).
• We consider actual sky masks used for a Subaru Suprime-Cam imaging survey.