Results 61 to 70 of about 64,982 (304)

Weak Gravitational Lensing Bispectrum

The Astrophysical Journal, 2001
Weak gravitational lensing observations probe the spectrum and evolution of density fluctuations and the cosmological parameters which govern them. The non-linear evolution of large scale structure produces a non-Gaussian signal which is potentially observable in galaxy shear data.
Wayne Hu, Wayne Hu, Asantha Cooray
openaire   +3 more sources

Shadows and gravitational weak lensing by the Schwarzschild black hole in the string cloud background with quintessential field [PDF]

Chinese Physics C, High Energy Physics & Nuclear Physics, 2022
In this study, we observe that, in the presence of the string cloud parameter a and the quintessence parameter γ, with the equation of state parameter , the radius of the shadow of the Schwarzschild black hole increases as compared with that in the pure ...
G. Mustafa, Farruh Atamurotov, Ibrar Hussain, Sanjar Shaymatov, A. Övgün   +4 more
semanticscholar   +1 more source

Intrinsic alignment boosting: Direct measurement of intrinsic alignments in cosmic shear data [PDF]

, 2010
Intrinsic alignments constitute the major astrophysical systematic for cosmological weak lensing surveys. We present a purely geometrical method with which one can study gravitational shear-intrinsic ellipticity correlations directly in weak lensing data.
Amara, B. Joachimi, Bacon, Benjamin, Bernstein, Bridle, Bridle, Brown, Catelan, Crittenden, Croft, Eifler, Eisenstein, Fu, Heymans, Heymans, Heymans, Hirata, Hirata, Huterer, Ilbert, Jing, Joachimi, Joachimi, Joachimi, King, King, King, Kitching, Lee, Mackey, Mandelbaum, Munshi, Okumura, Okumura, P. Schneider, Pen, Schneider, Schrabback, Semboloni, Smail, Smith, Takada, Tegmark, van den Bosch, van Waerbeke, Wittman   +46 more
core   +1 more source

Cross-correlation of the thermal Sunyaev–Zel’dovich effect and weak gravitational lensing: Planck and Subaru Hyper Suprime-Cam first-year data [PDF]

Monthly notices of the Royal Astronomical Society, 2019
Cross-correlation analysis of the thermal Sunyaev–Zel’dovich (tSZ) effect and weak gravitational lensing (WL) provides a powerful probe of cosmology and astrophysics of the intracluster medium. We present the measurement of the cross-correlation of tSZ
K. Osato, M. Shirasaki, H. Miyatake, D. Nagai, N. Yoshida, M. Oguri, R. Takahashi   +6 more
semanticscholar   +1 more source

Baryons, neutrinos, feedback and weak gravitational lensing [PDF]

Monthly Notices of the Royal Astronomical Society, 2015
(Abridged) The effect of baryonic feedback on the dark matter mass distribution is generally considered to be a nuisance to weak gravitational lensing. Measurements of cosmological parameters are affected as feedback alters the cosmic shear signal on angular scales smaller than a few arcminutes.
Massimo Viola, Catherine Heymans, Ludovic Van Waerbeke, Joachim Harnois-Déraps, Joachim Harnois-Déraps   +4 more
openaire   +4 more sources

Optical properties of null geodesics emerging from dynamical systems

European Physical Journal C: Particles and Fields, 2022
We study optical metrics via null geodesics as a central force system, deduce the related Binet equation and apply the analysis to certain solutions of Einstein’s equations with and without spherical symmetry.
D. Batic, S. Chanda, P. Guha
doaj   +1 more source

The mass–richness relation of optically selected clusters from weak gravitational lensing and abundance with Subaru HSC first-year data [PDF]

Nippon Tenmon Gakkai obun kenkyu hokoku, 2019
Constraining the relation between the richness N and the halo mass M over a wide redshift range for optically selected clusters is a key ingredient for cluster-related science in optical surveys, including the Subaru Hyper Suprime-Cam (HSC) survey.
Ryoma Murata, M. Oguri, T. Nishimichi, M. Takada, R. Mandelbaum, S. More, M. Shirasaki, A. Nishizawa, K. Osato   +8 more
semanticscholar   +1 more source

Cluster Weak Gravitational Lensing [PDF]

arXiv: Cosmology and Nongalactic Astrophysics, 2010
Weak gravitational lensing of background galaxies is a unique, direct probe of the distribution of matter in clusters of galaxies. We review several important aspects of cluster weak gravitational lensing together with recent advances in weak lensing techniques for measuring cluster lensing profiles and constraining cluster structure parameters.
openaire   +2 more sources

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 ...
Björn Malte Schäfer, Marvin Sipp, Robert Reischke, Robert Reischke   +3 more
openaire   +3 more sources

Gravitational lensing by a black-bounce-Reissner–Nordström spacetime

European Physical Journal C: Particles and Fields, 2022
We investigate the weak and strong deflection gravitational lensing by a black-bounce-Reissner–Nordström spacetime and obtain their lensing observables. Assuming the supermassive black holes in the Galactic Center and at the center of M87, Sgr A* and M87*
Jing Zhang, Yi Xie
doaj   +1 more source