Weak Gravitational Lensing by Large-Scale Structure
نویسندگان
چکیده
منابع مشابه
Detection of Weak Gravitational Lensing by Large-scale Structure
We report a detection of the coherent distortion of faint galaxies arising from gravitational lensing by foreground structures. This “cosmic shear” is potentially the most direct measure of the mass power spectrum, as it is unaffected by poorly-justified assumptions made concerning the biasing of the distribution. Our detection is based on an initial imaging study of 14 separated 8 × 16 fields ...
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We model weak gravitational lensing of light by large-scale structure using ray tracing through N-body simulations. The method is described with particular attention paid to numerical convergence. We investigate some of the key approximations in the multi-plane ray tracing algorithm. Our simulated shear and convergence maps are used to explore how well standard assumptions about weak lensing ho...
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On the arcminute angular scales probed by Planck, the cosmic microwave background (CMB) anisotropies are gently perturbed by gravitational lensing. Here we present a detailed study of this effect, detecting lensing independently in the 100, 143, and 217 GHz frequency bands with an overall significance of greater than 25σ. We use the temperature-gradient correlations induced by lensing to recons...
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Observational evidence shows that gravitational lensing induces an angular correlation between the distribution of galaxies and much more distant QSO’s. We use weak gravitational lensing theory to calculate this angular correlation, updating previous calculations and presenting new results exploring the dependence of the correlation on the large-scale structure. We study the dependence of the p...
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We describe an efficient algorithm for calculating the statistics of weak lensing by large-scale structure based on a tiled set of independent particle-mesh N-body simulations which telescope in resolution along the line of sight. This efficiency allows us to predict not only the mean properties of lensing observables such as the power spectrum, skewness and kurtosis of the convergence, but als...
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ژورنال
عنوان ژورنال: Annual Review of Astronomy and Astrophysics
سال: 2003
ISSN: 0066-4146,1545-4282
DOI: 10.1146/annurev.astro.41.111302.102207