منابع مشابه
ASKI: full-sky lensing map making algorithms
Within the context of upcoming full-sky lensing surveys, the edge-preserving nonlinear algorithm Aski (All Sky κ Inversion) is presented. Using the framework of Maximum A Posteriori inversion, it aims at recovering the optimal full-sky convergence map from noisy surveys with masks. Aski contributes two steps: (i) CCD images of possibly crowded galactic fields are deblurred using automated edge-...
متن کاملCALCLENS: weak lensing simulations for large-area sky surveys and second-order effects in cosmic shear power spectra
I present a new algorithm, Curved-sky grAvitational Lensing for Cosmological Light conE simulatioNS (CALCLENS), for efficiently computing weak gravitational lensing shear signals from large N-body light cone simulations over a curved sky. This new algorithm properly accounts for the sky curvature and boundary conditions, is able to produce redshift-dependent shear signals including corrections ...
متن کاملFull-sky maps for gravitational lensing of the CMB
We use the large cosmological Millennium Simulation (MS) to construct the first allsky maps of the lensing potential and the deflection angle, aiming at gravitational lensing of the CMB, with the goal of properly including small-scale non-linearities and non-Gaussianity. Exploiting the Born approximation, we implement a map-making procedure based on direct ray-tracing through the gravitational ...
متن کاملSecond-order weak lensing from modified gravity
R. Ali Vanderveld, Robert R. Caldwell, and Jason Rhodes Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109, USA California Institute of Technology, 1200 East California Boulevard, Pasadena, California 91125, USA Kavli Institute for Cosmological Physics, Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA Department of Physics and As...
متن کاملWeak lensing at the limit of the sky background noise
Recent weak lensing observations have pushed the use of 4 meter-class telescopes to the limits of their capabilities with exposure times exceeding several hours. The leading idea is that the surface density of faint galaxies up to very faint magnitude (B > 28−30) raises continuously thus potentially offering a dense template of distant sources whose intensity contrast is at the sky noise level....
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ژورنال
عنوان ژورنال: Physical Review D
سال: 2010
ISSN: 1550-7998,1550-2368
DOI: 10.1103/physrevd.81.083002