Results 101 to 110 of about 68,770 (225)

Gravitational lensing by a dark compact object in modified gravity and observational constraints from Einstein rings

European Physical Journal C: Particles and Fields
In this manuscript, we provide a comprehensive study of gravitational lensing by dark compact objects predicted by modified gravity (MOG) based on the scalar–vector–tensor action, with the aim of providing new insights into the nature of gravitational ...
Nagina Rehman, Zoe C. S. Chan, Mubasher Jamil, Mustapha Azreg-Aïnou   +3 more
doaj   +1 more source

Weak Gravitational Lensing by a Sample of X-Ray Luminous Clusters of Galaxies -- II. Comparison with Virial Masses

, 2002
Dynamic velocity dispersion and mass estimates are given for a sample of five X-ray luminous rich clusters of galaxies at intermediate redshifts (z~0.3) drawn from a sample of 39 clusters for which we have obtained gravitational lens mass estimates.
Adami C., Briel U. G., Colless M., Ebeling H., Eke V. R., Hakon Dahle, Lavery R. J., Liang H., Lilje P. B., Navarro J. F., Per B. Lilje, Ragnvald J. Irgens, S. J. Maddox, White S. D. M., Zwicky F.   +14 more
core   +1 more source

Galaxy–galaxy weak gravitational lensing in $f(R)$ gravity [PDF]

, 2017
We present an analysis of galaxy–galaxy weak gravitational lensing (GGL) in chameleon f(R) gravity – a leading candidate of non-standard gravity models. For the analysis, we have created mock galaxy catalogues based on dark matter haloes from two sets of
Baojiu Li, Masato Shirasaki Icc, Durham, Naoj   +3 more
semanticscholar   +1 more source

The galaxy-subhalo connection in low-redshift galaxy clusters from weak gravitational lensing [PDF]

, 2017
We measure the gravitational lensing signal around satellite galaxies in a sample of galaxy clusters at ...
C. Sif'on, R. Herbonnet, H. Hoekstra, R. Burg, M. Viola   +4 more
semanticscholar   +1 more source

ВЛИЯНИЕ ГРАВИТАЦИОННОГО ЛИНЗИРОВАНИЯ НА ФУНКЦИЮ СВЕТИМОСТИ КВАЗАРОВ

Odessa Astronomical Publications, 2011
The function of quasar distribution on apparent brightness is discussed. This function is found on base of suggestion that quasars, at least partly, are strong gravitational lensing images of the active nuclei of distant galaxies.
Ю. Л. Бухмастова
doaj   +1 more source

First test of Verlinde's theory of emergent gravity using weak gravitational lensing measurements [PDF]

, 2016
Verlinde (2016) proposed that the observed excess gravity in galaxies and clusters is the consequence of Emergent Gravity (EG). In this theory the standard gravitational laws are modified on galactic and larger scales due to the displacement of dark ...
M. Brouwer, Manus R. Visser, A. Dvornik, H. Hoekstra, K. Kuijken, E. Valentijn, Maciej Bilicki, C. Blake, S. Brough, H. Buddelmeijer, T. Erben, C. Heymans, H. Hildebrandt, B. Holwerda, A. Hopkins, D. Klaes, J. Liske, J. Loveday, J. McFarland, R. Nakajima, C. Sif'on, E. Taylor   +21 more
semanticscholar   +1 more source

Angular ellipticity correlations in a composite alignment model for elliptical and spiral galaxies and inference from weak lensing

, 2018
We investigate a physical, composite alignment model for both spiral and elliptical galaxies and its impact on cosmological parameter estimation from weak lensing for a tomographic survey. Ellipticity correlation functions and angular ellipticity spectra
Schaefer, Bjoern Malte, Tugendhat, Tim M.   +1 more
core   +1 more source

Flat-Sky Pseudo-Cls Analysis for Weak Gravitational Lensing [PDF]

Monthly notices of the Royal Astronomical Society, 2016
We investigate the use of estimators of weak lensing power spectra based on a flat-sky implementation of the Pseudo-Cl (PCl) technique, where the masked shear field is transformed without regard for masked regions of sky.
M. Asgari, A. Taylor, B. Joachimi, T. Kitching   +3 more
semanticscholar   +1 more source

Weak Gravitational Lensing

, 2006
180 pages, 57 figures, to appear in: Kochanek, C.S., Schneider, P., Wambsganss, J.: Gravitational Lensing: Strong, Weak & Micro. Lecture Notes of the 33rd Saas-Fee Advanced Course, G. Meylan, P. Jetzer & P.
openaire   +2 more sources

The weakly perturbed Schwarzschild lens in the strong deflection limit

, 2006
We investigate the strong deflection limit of gravitational lensing by a Schwarzschild black hole embedded in an external gravitational field. The study of this model, analogous to the Chang & Refsdal lens in the weak deflection limit, is important to ...
C. Darwin, K. Chang, M. Sereno, P. Schneider, S. Chandrasekhar, V. Bozza   +5 more
core   +1 more source