Results 61 to 70 of about 335,502 (306)
Study of Errors in Strong Gravitational Lensing [PDF]
The Astrophysical Journal, 2008 We examine the accuracy of strong gravitational lensing determinations of the mass of galaxy clusters by comparing the conventional approach with the numerical integration of the fully relativistic null geodesic equations in the case of weak gravitational perturbations on Robertson-Walker metrics.
Kling, Thomas P., Frittelli, S.
openaire +4 more sources
Measurements of the Hubble constant and cosmic curvature with quasars: ultracompact radio structure and strong gravitational lensing [PDF]
Monthly notices of the Royal Astronomical Society, 2020 Although the Hubble constant H0 and spatial curvature ΩK have been measured with very high precision, they still suffer from some tensions. In this paper, we propose an improved method to combine the observations of ultracompact structure in radio ...
Jingzhao Qi +4 more
semanticscholar +1 more source
Business Strategy and the Environment, Volume 32, Issue 1, Page 551-569, January 2023., 2023 Abstract Increasing regulatory obligations to adapt and execute environmentally friendly operations make it critical for businesses to pursue strategies that can strengthen their competitive edge in the market. Academics and practitioners alike have recently gravitated toward exploring how knowledge acquisition activities might improve business ...
Saumyaranjan Sahoo +2 more
wiley +1 more source
Precision Modeling of JWST's First Cluster Lens SMACS J0723.3–7327
The Astrophysical Journal, 2023 Exploiting the fundamentally achromatic nature of gravitational lensing, we present a lens model for the massive galaxy cluster SMACS J0723.3−7323 (SMACS J0723; z = 0.388) that significantly improves upon earlier work.
Guillaume Mahler +14 more
doaj +1 more source
The Astrophysical Journal, 2023 In this work, we adopt a cosmological model-independent approach for the first time to test the question of whether the mass density power-law index ( γ ) of strong gravitational lensing systems (SGLSs) evolves with redshift, and the joint light-curve ...
Jian Hu
doaj +1 more source
Phase effects from strong gravitational lensing of gravitational waves [PDF]
Physical Review D, 2020 Assessing the probability that two or more gravitational wave (GW) events are lensed images of the same source requires an understanding of the properties of the lensed images.
J. Ezquiaga +4 more
semanticscholar +1 more source
Two Lensed Star Candidates at z ≃ 4.8 behind the Galaxy Cluster MACS J0647.7+7015
The Astrophysical Journal Letters, 2023 We report the discovery of two extremely magnified lensed star candidates behind the galaxy cluster MACS J0647.7+015 using recent multiband James Webb Space Telescope (JWST) NIRCam observations. The star candidates are seen in a previously known, z _phot
Ashish Kumar Meena +28 more
doaj +1 more source
Resolving the discrepancy between X-ray and gravitational lensing mass measurements for clusters of galaxies [PDF]
, 1997 We present a detailed comparison of mass measurements for clusters of galaxies using ASCA and ROSAT X-ray data and constraints from strong and weak gravitational lensing.
Allen, S. W.
core +2 more sources
Strong gravitational lensing by a strongly naked null singularity [PDF]
Physical Review D, 2020 We study strong gravitational lensing in a static, spherically symmetric, naked singularity spacetime, without a photon sphere. The nature of the singularity is found to be lightlike.
Suvankar Paul
semanticscholar +1 more source
The Strongest Cluster Lenses: An Analysis of the Relation Between Strong Gravitational Lensing Strength and the Physical Properties of Galaxy Clusters [PDF]
ApJ 928, 87 (2021), 2021 Strong gravitational lensing provides unique opportunities to investigate the mass distribution at the cores of galaxy clusters and to study high redshift galaxies. Using $94$ strong lensing models of $74$ cluster fields from the \textit{Hubble} Frontier Fields (HFF), Reionization Lensing Cluster Survey (RELICS), and Sloan Giant Arcs Survey (SGAS ...
arxiv +1 more source