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DE200515014580

Publication Date	2004
Personal Author	Schlaufman, K.
Page Count	14
Abstract	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.
Keywords	Turbulence Ellipticity Gravitational lenses Astronomical bodies Atmospheric motion Stars Simulations Perturbation theory Distance Telescopes Adaptive optics Measurement Atmospheric turbulence
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Lawrence Livermore National Lab., CA.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200522

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

Simulations of Turbulence Induced Ellipticity Over Large Fields of View: The First Step Towards Enabling LSST Weak Lensing Science.
DE200515014580

Publication Date	2004
Personal Author	Schlaufman, K.
Page Count	14
Abstract	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.
Keywords	Turbulence Ellipticity Gravitational lenses Astronomical bodies Atmospheric motion Stars Simulations Perturbation theory Distance Telescopes Adaptive optics Measurement Atmospheric turbulence
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Lawrence Livermore National Lab., CA.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200522