제목: NIRWL: Identifying Systematics in Near-infrared Weak-lensing Measurements with CANDELS/HST​

Upcoming weak-lensing surveys with telescopes such as Euclid, Rubin, and Roman will measure the properties of the universe with unprecedented statistical precision. In parallel with the increased precision is a requirement for comparable advances in systematics control. We have undertaken a Near-IR Weak-Lensing (NIRWL) study of the CANDELS/HST fields as a testbed for future surveys. Utilizing the wide fields of CANDELS, we are exploring the impact of observed systematic effects of near-IR detectors on weak lensing. The lessons learned from our weak-lensing study will be critical for future weak-lensing surveys. Our careful modeling of the HST near-IR PSF has shown that IR weak lensing will have considerable systematic biases that must be corrected. In this talk, the IR observations of the CANDELS fields will be introduced. We will discuss the systematic effects and their significance for weak-lensing measurements. We will highlight the importance of sampling and discuss the bias that undersampling will imprint on Euclid and Roman observations. Early results from the weak-lensing analysis will be presented.​