Simulations of Turbulence Induced Ellipticity Over Large Fields of View: The First Step Towards Enabling LSST Weak Lensing Science.

Schlaufman, K.

Technical Information Center Oak Ridge Tennessee

关键词: Turbulence;    Ellipticity;    Gravitational lenses;    Astronomical bodies;    Atmospheric motion;   

RP-ID  :  DE200515014580

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

Atmospheric turbulence can mimic the effects of weak lensing in astronomical images, so it is necessary to understand to what degree turbulence effects weak lensing measurements. In particular, we studied the ellipticity induced upon the point-spread functions (PSFs) of a grid of simulated stars separated by distances that will be characteristic of Large Synoptic Survey Telescope (LSST) images. We observe that atmospherically induced ellipticity changes on small scales and use linear interpolation between stars separated by scales to determine the induced ellipticity everywhere in the field-of-view.