Results 31 to 40 of about 3,386 (168)
The Astrophysical Journal, 2022 We present new light curves for the four bright images of the five image cluster-lensed quasar gravitational lens system SDSS J1004+4112. The light curves span 14.5 yr and allow the measurement of the time delay between the trailing bright quasar image D
J. A. Muñoz +5 more
doaj +1 more source
Self-consistent gravitational lens reconstruction [PDF]
Monthly Notices of the Royal Astronomical Society, 1998 We present a new method for directly determining accurate, self-consistent cluster lens mass and shear maps in the strong lensing regime from the magnification bias of background galaxies. The method relies upon pixellisation of the surface mass density distribution which allows us to write down a simple, solvable set of equations.
Dye, S., Taylor, A.
openaire +2 more sources
A Forward, Analytic, Differentiable, Geometric (but Inflexible) Lens Model
GalaxiesWe anticipate that hundreds of thousands of distant, strongly gravitationally lensed sources will be detectable with European Space Agency’s (ESA) Euclid mission and the Rubin Observatory Legacy Survey of Space and Time.
Paul L. Schechter
doaj +1 more source
The gravitational lens equation [PDF]
, 2003 Questo lavoro di tesi discute approfondimenti teorici ed applicazioni cosmografiche dell'equazione della lente gravitazionale. Questa è l'equazione fondamentale del lensing gravitazionale, la teoria che descrive la deflessione della luce causata da campi gravitazionali.
openaire +1 more source
IMAGES DISTRIBUTION OF BINARY SYMMETRICAL GRAVITATIONAL LENS
Odessa Astronomical Publications, 2019 In this paper, we study the distribu- tion of images from a point source in N - point gravi- tational lenses. It is well known that in a Schwarzschild lens (N = 1) from a point source, there are always two images.
A. T. Kotvytskiy +2 more
doaj +1 more source
Galaxy mergers and gravitational lens statistics [PDF]
The Astrophysical Journal, 1994 We investigate the impact of hierarchical galaxy merging on the statistics of gravitational lensing of distant sources. Since no definite theoretical predictions for the merging history of luminous galaxies exist, we adopt a parametrized prescription, which allows us to adjust the expected number of pieces comprising a typical present galaxy at z=0.65.
Rix, Hans-Walter +3 more
openaire +2 more sources
Gravitational lens interference
The Astrophysical Journal, 1991 The consequence of the existence, when a lens is present, of two propagation paths from a source to the observer is investigated. Attention is focused on quasars as background sources; however, the results received are general and apply to pulsars and stellar sources as well. 12 refs.
J. B. Peterson, Toby Falk
openaire +1 more source
Scattering of gravitational waves by the weak gravitational fields of lens objects [PDF]
Astronomy & Astrophysics, 2005 We consider the scattering of the gravitational waves by the weak gravitational fields of lens objects. We obtain the scattered gravitational waveform by treating the gravitational potential of the lens to first order, i.e. using the Born approximation.
Takahashi, R. +2 more
openaire +3 more sources
QUASI-ANALYTICAL METHOD FOR IMAGES CONSTRUCTION FROM GRAVITATIONAL LENSES
Odessa Astronomical Publications, 2016 One of the main problems in the study of system of equations of the gravitational lens, is the computation of coordinates from the known position of the source. In the process of computing finds the solution of equations with two unknowns. The problem is
A. T. Kotvytskiy, S. D. Bronza
doaj +1 more source
The Astrophysical Journal, 2023 Modeling strong gravitational lenses in order to quantify distortions in the images of background sources and to reconstruct the mass density in foreground lenses has been a difficult computational challenge.
Alexandre Adam +3 more
doaj +1 more source