Results 21 to 30 of about 591 (218)
Simulations of weak gravitational lensing [PDF]
Astroparticle Physics, 2004 15 pages, 9 figures, Astroparticle Physics in ...
White, Martin, Vale, Chris
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Optimizing tomography for weak gravitational lensing surveys [PDF]
Monthly Notices of the Royal Astronomical Society, 2020 ABSTRACT The subject of this paper is optimization of weak lensing tomography: we carry out numerical minimization of a measure of total statistical error as a function of the redshifts of the tomographic bin edges by means of a Nelder–Mead algorithm in order to optimize the sensitivity of weak lensing with respect to different ...
Marvin Sipp +2 more
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Image Simulations for Strong and Weak Gravitational Lensing [PDF]
Symmetry, 2020 Gravitational lensing has been identified as a powerful tool to address fundamental problems in astrophysics at different scales, ranging from exoplanet identification to dark energy and dark matter characterization in cosmology. Image simulations have played a fundamental role in the realization of the full potential of gravitational lensing by ...
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Weak Gravitational Lensing by Galaxies [PDF]
The Astrophysical Journal, 1996 We report a detection of weak, tangential distortion of the images of cosmologically distant, faint galaxies due to gravitational lensing by foreground galaxies. A mean image polarization of ({ital p})=0.011{plus_minus}0.006 (95{percent} confidence bounds) is obtained for 3202 pairs of source (23{lt}{ital r}{sub {ital s}}{le}24) and lens (20{le}{ital r}
Brainerd, Tereasa G. +2 more
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Circular Orbit of a Particle and Weak Gravitational Lensing [PDF]
Physical Review D, 2020 The purpose of this paper is twofold. First, we introduce a geometric approach to study the circular orbit of a particle in static and spherically symmetric spacetime based on Jacobi metric. Second, we apply the circular orbit to study the weak gravitational deflection of null and time-like particles based on Gauss-Bonnet theorem.
Zonghai Li, Guodong Zhang, Ali Övgün
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Gravitational lensing by a quantum deformed Schwarzschild black hole
European Physical Journal C: Particles and Fields, 2021 We investigate the weak and strong deflection gravitational lensing by a quantum deformed Schwarzschild black hole and find their observables. These lensing observables are evaluated and the detectability of the quantum deformation is assessed, after ...
Xu Lu, Yi Xie
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Probing satellite haloes with weak gravitational lensing [PDF]
Monthly Notices of the Royal Astronomical Society, 2012 We demonstrate the possibility of detecting tidal stripping of dark matter subhalos within galaxy groups using weak gravitational lensing. We have run ray-tracing simulations on galaxy catalogues from the Millennium Simulation to generate mock shape catalogues. The ray-tracing catalogues assume a halo model for galaxies and groups, using various models
Gillis, Bryan R. +3 more
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3D weak gravitational lensing of the CMB and galaxies [PDF]
Monthly Notices of the Royal Astronomical Society, 2015 Accepted to ...
Kitching, TD, Heavens, AF, Das, S
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Weak gravitational lensing in fourth order gravity [PDF]
Physical Review D, 2012 For a general class of analytic $f(R,R_{αβ}R^{αβ},R_{αβγδ}R^{αβγδ})$ we discuss the gravitational lensing in the Newtonian Limit of theory. From the properties of Gauss Bonnet invariant it is successful to consider only two curvature invariants between the Ricci and Riemann tensor.
Stabile, A., Stabile, An.
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Radio weak gravitational lensing with VLA and MERLIN [PDF]
Monthly Notices of the Royal Astronomical Society, 2010 We carry out an exploratory weak gravitational lensing analysis on a combined VLA and MERLIN radio data set: a deep (3.3 micro-Jy beam^-1 rms noise) 1.4 GHz image of the Hubble Deep Field North. We measure the shear estimator distribution at this radio sensitivity for the first time, finding a similar distribution to that of optical shear estimators ...
Patel, Prina +4 more
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