Optimal point spread function modeling for weak lensing: complexity and sparsity
نویسندگان
چکیده
منابع مشابه
Optimal PSF modeling for weak lensing : complexity and sparsity
Context. We address the issue of controling the systematic errors in shape measurements for weak gravitational lensing. Aims. We make a step to quantify the impact of systematic errors in modeling the point spread function (PSF) of observations, on the determination of cosmological parameters from cosmic shear. Methods. We explore the impact of PSF fitting errors on cosmic shear measurements us...
متن کاملOptimal PSF modelling for weak lensing : complexity and sparsity
Context. Controlling shape measurement systematics in weak gravitational lensing. Aims. Quantifying the effect of systematic errors in modelling the Point Spread Function (PSF) on cosmological parameter measurements from cosmic shear. Methods. We explore the impact of PSF fitting errors on cosmic shear measurements using the concepts of complexity and sparsity. Complexity, introduced in a previ...
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The need for interpolation between pixels arises in many contexts. Kriging provides a general theory for optimal linear interpolation, which can be implemented and interpreted in either spatial or frequency domains. Of critical importance is knowledge of the autocorrelation function of the image at sub-pixel distances or, equivalently, the form of the spectrum near the Nyquist frequency. Althou...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2009
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361/200811061