Results 11 to 20 of about 184 (166)
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 +8 more sources
Topological defects in gravitational lensing shear fields [PDF]
Journal of Cosmology and Astroparticle Physics, 2009 17 pages, 4 ...
Vitelli, Vincenzo +2 more
openaire +2 more sources
Shear and Ellipticity in Gravitational Lenses [PDF]
The Astrophysical Journal, 1997 38 pages, 9 figures, submitted to ...
Keeton, C. R. +2 more
openaire +2 more sources
MULTIPOLE FORMULAE FOR GRAVITATIONAL LENSING SHEAR AND FLEXION [PDF]
The Astrophysical Journal, 2009 ABSTRACT The gravitational lensing equations for convergence, potential, shear, and flexion are simple in polar coordinates and separate under a multipole expansion once the shear and flexion spinors are rotated into a “tangential” basis.
Bernstein, Gary M., Nakajima, Reiko
openaire +2 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 +3 more sources
THE EFFECT OF ENVIRONMENT ON SHEAR IN STRONG GRAVITATIONAL LENSES [PDF]
The Astrophysical Journal, 2010 Accepted for publication in The Astrophysical Journal; 28 pages, 9 figures, 5 ...
Wong, Kenneth C. +4 more
openaire +3 more sources
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).
Tianqing Zhang +4 more
openaire +2 more sources
Statistics of Extreme Gravitational Lensing Events. I. The Zero Shear Case [PDF]
The Astrophysical Journal, 1996 For a given source and lens pair, there is a thin on-axis tube-like volume behind the lens in which the radiation flux from the source is greatly increased due to gravitational lensing. Any objects (such as dust grains) which pass through such a thin tube will experience strong bursts of radiation, i.e., Extreme Gravitational Lensing Events (EGLE).
Wang, Yun, Turner, Edwin L.
openaire +2 more sources
Statistics of Extreme Gravitational Lensing Events. II. The Finite Shear Case [PDF]
The Astrophysical Journal, 1997 17 pages including 3 figures, using AAS LATEX macros v4.0.
Wang, Yun, Turner, Edwin L.
openaire +2 more sources
Means of confusion: how pixel noise affects shear estimates for weak gravitational lensing [PDF]
Monthly Notices of the Royal Astronomical Society, 2012 integrated the origin of the moment correlation (thanks to Alan Heavens).
Melchior, P., Viola, M.
openaire +4 more sources