Results 41 to 50 of about 1,065 (217)
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.
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Weak gravitational lensing by stringy black holes [PDF]
The European Physical Journal Plus, 2019 In this paper, we discuss the weak gravitational lensing in the context of stringy black holes. Initially, we examine the deflection angle of photon by charged stringy black hole. For this desire, we compute the Gaussian optical curvature and implement the Gauss-Bonnet theorem to investigate the deflection angle for spherically balanced spacetime of ...
Ali Övgün +4 more
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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 ...
Björn Malte Schäfer +3 more
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Weak gravitational lensing Schwarzschild-MOG black hole in plasma
European Physical Journal C: Particles and Fields, 2021 This paper is devoted to study weak gravitational lensing properties around black hole surrounded plasma medium in modified gravity (MOG). We have investigated the effects of the MOG-parametr and plasma medium on the deflection angle and total ...
Farruh Atamurotov +2 more
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Instrumental systematics and weak gravitational lensing [PDF]
Journal of Instrumentation, 2015 We present a pedagogical review of the weak gravitational lensing measurement process and its connection to major scientific questions such as dark matter and dark energy. Then we describe common ways of parametrizing systematic errors and understanding how they affect weak lensing measurements.
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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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Current status of weak gravitational lensing
New Astronomy Reviews, 2002 Weak gravitational lensing of distant galaxies by foreground structures has proven to be a powerful tool to study the mass distribution in the universe. Nowadays, attention has shifted from clusters of galaxies to the statistical properties of the large scale structures and the halos of (field) galaxies. These applications have become feasible with the
Henk Hoekstra +3 more
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Weak gravitational lensing with CO galaxies [PDF]
, 2018 Optical weak lensing surveys have become a powerful tool for precision cosmology, but remain subject to systematic effects that can severely bias cosmological parameter estimates if not carefully removed. We discuss the possibility of performing complementary weak lensing surveys at radio/microwave frequencies, using detections of CO-emitting galaxies ...
Bull, P, Harrison, I, Huff, E
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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 $f(R,R_{ }R^{ },R_{ }R^{ })$ 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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