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

Schlaufman, K

Lawrence Livermore National Laboratory

关键词: Turbulence;    Telescopes;    Interpolation;    Stars;    99 General And Miscellaneous//Mathematics, Computing, And Information Science;   

DOI  :  10.2172/15014580
RP-ID  :  UCRL-TR-207730
RP-ID  :  W-7405-ENG-48
RP-ID  :  15014580

美国|英语

来源: UNT Digital 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 affects 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 (d {approx} 1{prime}) that will be characteristic of Large Synoptic Survey Telescope (LSST) images. We observe that atmospherically induced ellipticity changes on small scales (d < 0.5{prime}) and use linear interpolation between stars separated by d = 0.5{prime} to determine the induced ellipticity everywhere in the field-of-view.