Lensing Systematics from Space: Modeling PSF effects in the SNAP survey

Simple item page
dc.creatorStabenau, H. F.
dc.creatorJain, B.
dc.creatorBernstein, G.
dc.creatorLampton, M.
dc.date2007-10-17
dc.date.accessioned2026-07-07T08:36:55Z
dc.date.available2026-07-07T08:36:55Z
dc.descriptionAnisotropy in the point spread function (PSF) contributes a systematic error to weak lensing measurements. In this study we use a ray tracer that incorporates all the optical elements of the SNAP telescope to estimate this effect. Misalignments in the optics generates PSF anisotropy, which we characterize by its ellipticity. The effect of three time varying effects: thermal drift, guider jitter, and structural vibration on the PSF are estimated for expected parameters of the SNAP telescope. Multiple realizations of a thousand square degree mock survey are then generated to include the systematic error pattern induced by these effects. We quantify their contribution to the power spectrum of the lensing shear. We find that the dominant effect comes from the thermal drift, which peaks at angular wavenumbers l ~ 10^3, but its amplitude is over one order of magnitude smaller than the size of the expected statistical error. While there are significant uncertainties in our modeling, our study indicates that time-varying PSFs will contribute at a smaller level than statistical errors in SNAP's weak lensing measurements.
dc.description11 pages, 4 figures
dc.identifierhttps://arxiv.org/abs/0710.3355
dc.identifierhttp://arxiv.org/abs/0710.3355
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/140227
dc.subjectAstrophysics
dc.titleLensing Systematics from Space: Modeling PSF effects in the SNAP survey
dc.typetext

Files

Collections

arXiv