Results 61 to 70 of about 797,854 (217)
A NEW CHANNEL FOR DETECTING DARK MATTER SUBSTRUCTURE IN GALAXIES: GRAVITATIONAL LENS TIME DELAYS [PDF]
, 2008 We show that dark matter substructure in galaxy-scale halos perturbs the time delays between images in strong gravitational lens systems. The variance of the effect depends on the subhalo mass function, scaling as the product of the substructure mass ...
C. Keeton, L. A. Moustakas
semanticscholar +1 more source
Bayesian strong gravitational-lens modelling on adaptive grids: objective detection of mass substructure in Galaxies [PDF]
, 2008 We introduce a new adaptive and fully Bayesian grid-based method to model strong gravitational lenses with extended images. The primary goal of this method is to quantify the level of luminous and dark mass substructure in massive galaxies, through their
S. Vegetti, L. Koopmans
semanticscholar +1 more source
The role of luminous substructure in the gravitational lens system MG 2016+112 [PDF]
, 2008 MG 2016+112 is a quadruply imaged lens system with two complete images A and B and a pair of merging partial images in region C as seen in the radio. The merging images are found to violate the expected mirror symmetry.
A. More +7 more
semanticscholar +1 more source
Multimodal multi-output ordinal regression for discovering gravitationally-lensed transients
Machine Learning: Science and TechnologyGravitational lenses are caused by massive astronomical objects that distort space-time, bending light. They can distort transient astrophysical events, such as supernovae (SN), which are the subject of extensive study.
Nicolò Oreste Pinciroli Vago +1 more
doaj +1 more source
Comparison of approximate gravitational lens equations and a proposal for an improved new one [PDF]
, 2008 Keeping the exact general relativistic treatment of light bending as a reference, we compare the accuracy of commonly used approximate lens equations. We conclude that the best approximate lens equation is the Ohanian lens equation, for which we present ...
V. Bozza
semanticscholar +1 more source
European Physical Journal C: Particles and Fields, 2019 The significance of the radial velocity effects on the leading-order gravitational frequency shift in some special cases was reported recently. This paper investigates the gravitational shift of frequency of light propagating in the equatorial plane of a
Guansheng He, Chaohong Pan, Wenbin Lin
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European Physical Journal C: Particles and Fields, 2022 In this work, we discuss a new method to probe the redshift evolution of the gas depletion factor, i.e. the ratio by which the gas mass fraction of galaxy clusters is depleted with respect to the universal mean of baryon fraction.
R. F. L. Holanda +2 more
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Detecting Dark Objects with Plasma Microlensing by Their Gravitational Wakes
The Astrophysical JournalA moving mass makes a gravitational wake in the partially ionized interstellar medium, which acts as a lens for radio-frequency light. Consequently, plasma microlensing could complement gravitational microlensing in the search for invisible massive ...
M. Sten Delos
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European Physical Journal C: Particles and FieldsIn 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 +3 more
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Inferring Properties of Dark Galactic Halos Using Strongly Lensed Gravitational Waves
The Astrophysical JournalGravitational waves (GWs) can be deflected, similarly to electromagnetic (EM) waves, by massive objects through the phenomenon of gravitational lensing .
Eungwang Seo +2 more
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