Monthly Notices of the Royal Astronomical Society, 2022 ABSTRACT Recovering credible cosmological parameter constraints in a weak lensing shear analysis requires an accurate model that can be used to marginalize over nuisance parameters describing potential sources of systematic uncertainty, such as the uncertainties on the sample redshift distribution n(z).
Ben Moews +2 more
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im3shape: a maximum likelihood galaxy shear measurement code for cosmic gravitational lensing [PDF]
Monthly Notices of the Royal Astronomical Society, 2013 We present and describe im3shape, a new publicly available galaxy shape measurement code for weak gravitational lensing shear. im3shape performs a maximum likelihood fit of a bulge-plus-disc galaxy model to noisy images, incorporating an applied point spread function.
Tomasz Kacprzak, Joe Zuntz, Barnaby Rowe
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Strong gravitational lensing’s ‘external shear’ is not shear
Monthly Notices of the Royal Astronomical SocietyABSTRACT The distribution of mass in galaxy-scale strong gravitational lenses is often modelled as an elliptical power-law plus ‘external shear’, which notionally accounts for neighbouring galaxies and cosmic shear along our line of sight.
Marceau Limousin +2 more
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Characterizing the shapes of galaxy clusters using moments of the gravitational lensing shear
Astroparticle Physics, 2005 17 pages, 6 figures; added references, corrected typos, matches published ...
Martin White
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Weak gravitational lensing shear measurement with FPFS: analytical mitigation of noise bias and selection bias [PDF]
Monthly Notices of the Royal Astronomical Society, 2022 ABSTRACT Dedicated ‘Stage IV’ observatories will soon observe the entire extragalactic sky, to measure the ‘cosmic shear’ distortion of galaxy shapes by weak gravitational lensing. To measure the apparent shapes of those galaxies, we present an improved version of the Fourier Power Function Shapelets (FPFS) shear measurement method. This
Yin Li, Richard Massey, Xiangchong Li
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Weak gravitational lensing in the standard cold dark matter model, using an algorithm for three-dimensional shear [PDF]
Monthly Notices of the Royal Astronomical Society, 1999 We investigate the effects of weak gravitational lensing in the standard Cold Dark Matter cosmology, using an algorithm which evaluates the shear in three dimensions. The algorithm has the advantage of variable softening for the particles, and our method allows the appropriate angular diameter distances to be applied to every evaluation location within
Peter Thomas, H M P Couchman
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Gravitational Lensing: From μ-Lensing to Cosmic Shear Experiments
2005These notes present the physics of gravitational lensing in various cosmological contexts. The equations and approximations that are commonly used to describe the displacement field or the amplification effects are presented. Several observational applications are discussed. They range from micro-lensing effects to cosmic shear detection that is a weak
Francis Bernardeau
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Shear and magnification angular power spectra and higher-order moments from weak gravitational lensing [PDF]
Monthly Notices of the Royal Astronomical Society, 2003 Revised in accordance with referee's report; now accepted by ...
A N Taylor
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Measuring the three-dimensional shear from simulation data, with applications to weak gravitational lensing [PDF]
Monthly Notices of the Royal Astronomical Society, 1999 22 pages, latex, 11 ...
Peter Thomas, H M P Couchman
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Weak Gravitational Lensing Diagnostic Tests in Preparation for Stage-IV Cosmic Shear
In the next decade, surveys such as the Vera C. Rubin Observatory’s Legacy Survey of Space and Time (LSST), ESA’s Euclid mission, and NASA’s Nancy Grace Roman Space Telescope, will collect data for billions of galaxies across the sky, mapping the underlying web-like structure of the universe evolving over cosmic time.openaire +1 more source