Results 1 to 10 of about 1,077 (214)
KiDS-1000 catalogue: Weak gravitational lensing shear measurements [PDF]
Astronomy & Astrophysics, 2021 We present weak lensing shear catalogues from the fourth data release of the Kilo-Degree Survey, KiDS-1000, spanning 1006 square degrees of deep and high-resolution imaging. Our ‘gold-sample’ of galaxies, with well-calibrated photometric redshift distributions, consists of 21 million galaxies with an effective number density of 6.17 galaxies per square
Giblin, B. +22 more
openaire +12 more sources
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
doaj +2 more sources
SELF-CALIBRATION OF GRAVITATIONAL SHEAR-GALAXY INTRINSIC ELLIPTICITY CORRELATION IN WEAK LENSING SURVEYS [PDF]
The Astrophysical Journal, 2010 14 pages, 4 figures. Heavily expanded version. No changes in major results and conclusions.
Pengjie Zhang, Zhang, Pengjie
openaire +3 more sources
Gravitational Shear, Flexion, and Strong Lensing in Abell 1689 [PDF]
The Astrophysical Journal, 2007 We present a gravitational lensing analysis of the galaxy cluster Abell 1689, incorporating measurements of the weak shear, flexion, and strong lensing induced in background galaxies. This is the first time that a shapelet technique has been used to reconstruct the distribution of mass in this cluster, and the first time that a flexion signal has been ...
Leonard, Adrienne +3 more
openaire +5 more sources
The Astronomical Journal, 2023 The Superpressure Balloon-borne Imaging Telescope ( SuperBIT ) is a diffraction-limited, wide-field, 0.5 m, near-infrared to near-ultraviolet observatory designed to exploit the stratosphere’s space-like conditions.
Jacqueline E. McCleary +25 more
doaj +4 more sources
Spectral Stacking: Unbiased Shear Estimation for Weak Gravitational Lensing [PDF]
, 2009 We present a new method for the estimation of shear in gravitational lensing from a set of galaxy images with unknown distribution of shapes. Common procedures first compute an estimate of some characteristic feature for each individual galaxy and then average over these.
Hosseini, R., Bethge, M.
openaire +2 more sources
Optimal cosmology from gravitational lensing: utilising the magnification and shear signals [PDF]
, 2015 Gravitational lensing studies the distortions of a distant galaxy’s observed size, shape or flux due to the tidal bending of photons by matter between the source and observer. Such distortions can be used to infer knowledge on the mass distribution of the intervening matter, such as the dark matter halos in which clusters of individual galaxies may ...
Duncan, Christopher Alexander James
openaire +2 more sources
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
doaj +1 more source
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
openaire +2 more sources
Testing Velocity-field Lensing on IllustrisTNG Galaxies
The Astrophysical Journal, 2023 Weak gravitational lensing shear could be measured far more precisely if information about unlensed attributes of source galaxies were available. Disk galaxy velocity fields supply such information, at least in principle, with idealized models predicting
Jean Donet, David Wittman
doaj +1 more source