Peaks in weak lensing mass maps for cluster astrophysics and cosmology [PDF]
Proceedings of the Japan Academy. Series B, Physical and Biological SciencesClusters of galaxies can be identified from the peaks in weak lensing aperture mass maps constructed from weak lensing shear catalogs. Such purely gravitational cluster selection differs considerably from traditional cluster selection based on the ...
Masamune OGURI, Satoshi MIYAZAKI
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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 +2 more
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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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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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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, Thomas Peter A
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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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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 ...
Taylor A N, 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, Thomas Peter A
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Toward an Optimal Reconstruction of the Shear Field with PDF-folding
The Astrophysical Journal, 2023 Weak lensing provides a direct way of mapping the density distribution in the Universe. To reconstruct the density field from the shear catalog, an important step is to build the shear field from the shear catalog, which can be quite nontrivial due to ...
Haoran Wang +3 more
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Shear and Ellipticity in Gravitational Lenses [PDF]
The Astrophysical Journal, 1997 Galaxies modeled as singular isothermal ellipsoids with an axis ratio distribution similar to the observed axis ratio distribution of E and S0 galaxies are statistically consistent with both the observed numbers of two-image and four-image lenses and the inferred ellipticities of individual lenses.
Keeton, C. R. +2 more
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