Statistics of Dark Matter Halos from Gravitational Lensing

2000 ◽  
Vol 530 (1) ◽  
pp. L1-L4 ◽  
Author(s):  
Bhuvnesh Jain ◽  
Ludovic Van Waerbeke
Keyword(s):  
Dark Matter ◽  
Gravitational Lensing ◽  
Dark Matter Halos

Dark Matter

2018 ◽  
pp. 169-174
Author(s):  
Alvaro De Rújula
Keyword(s):  
General Relativity ◽  
Dark Matter ◽  
Solar Eclipse ◽  
Gravitational Lensing ◽  
Virial Theorem ◽  
Dark Matter Halos ◽  
Gravitational Lenses ◽  
Coma Cluster ◽  
Cluster Of Galaxies ◽  
Galactic Dark Matter

What we know or do not know about dark matter. The evidence for its existence, first found by Fritz Zwicky. The “virial theorem” and the Coma cluster. The rotation curves of galaxies. Galactic dark-matter halos. Gravitational lensing and the May 1919 solar eclipse, a thiumph of General Relativity that propelled Einstein to his fame. The deflection of starlight by the eclipsed Sun. Gravitational lenses, Einstein rings, and Smilie. Gravitational-lensing and evidence for dark matter in the Bullet cluster of galaxies.

scholarly journals Strong Gravitational Lensing: Bright Galaxies & Lost Dark-Matter

2007 ◽  
Vol 3 (S244) ◽  
pp. 196-205 ◽  
Author(s):  
L. V. E. Koopmans
Keyword(s):  
Dark Matter ◽  
Gravitational Lensing ◽  
Stellar Dynamics ◽  
Mass Range ◽  
Gravitational Lens ◽  
Dark Matter Halos ◽  
Dynamic Mass ◽  
Dark Matter Mass ◽  
Virial Mass ◽  
Future Work

AbstractGravitational lensing and stellar dynamics provide two complementary methods to probe the smooth and clumpy stellar and dark-matter mass distribution in early-type galaxies, currently already over a range of two orders of magnitude in virial mass, more than ten orders of magnidude in dynamic mass range in each galaxy (i.e. from stars, CDM substructure to massive dark-matter halos), over 0–1 in redshift, and a range of 0–100 effective radii. This makes their unification a powerful new tool in the study of the formation, structure and evolution of these massive systems. I review recent results that we obtained, based on gravitational lens systems from the Sloan Lens ACS Survey (SLACS), and outline some ongoing and future work.

scholarly journals Imaging of SDSSz> 6 Quasar Fields: Gravitational Lensing, Companion Galaxies, and the Host Dark Matter Halos

2005 ◽  
Vol 626 (2) ◽  
pp. 657-665 ◽  
Author(s):  
Chris J. Willott ◽  
Will J. Percival ◽  
Ross J. McLure ◽  
David Crampton ◽  
John B. Hutchings ◽  
...  
Keyword(s):  
Dark Matter ◽  
Gravitational Lensing ◽  
Dark Matter Halos

scholarly journals GRAVITATIONAL WAVE ENHANCEMENT AS A TOOL TO DISTINGUISH DARK MATTER HALO PROFILES

2019 ◽  
Vol 55 (2) ◽  
pp. 231-235
Author(s):  
Sergio Grijalva Castillo ◽  
Carlos Calcáneo-Roldán
Keyword(s):  
Dark Matter ◽  
Gravitational Lensing ◽  
Dark Matter Halo ◽  
Spherically Symmetric ◽  
Dark Matter Halos ◽  
Recent Success ◽  
Galactic Dark Matter ◽  
Matter Model ◽  
Invaluable Tool ◽  
Dark Matter Model

The recent success of the dark matter model has proven to be an invaluable tool for describing the formation, evolution and stability of galaxies. In this work we study the enhancement function, F , of the gravitational lensing of gravitational waves by galactic dark matter halos and show how this function may be used to distinguish between halo models. In particular we compare an isothermal sphere with an NFW type density distribution, both of which are assumed to be spherically symmetric, and find that our technique clearly distinguishes between the models.

scholarly journals Dark Matter Halos from the Inside Out

2011 ◽  
Vol 2011 ◽  
pp. 1-17 ◽  
Author(s):  
James E. Taylor
Keyword(s):  
Dark Matter ◽  
Gravitational Lensing ◽  
Dark Matter Halos ◽  
Common Variants ◽  
Formation History ◽  
Theoretical Predictions ◽  
Internal Properties ◽  
Inside Out ◽  
The Universe ◽  
Individual Cluster

The balance of evidence indicates that individual galaxies and groups or clusters of galaxies are embedded in enormous distributions of cold, weakly interacting dark matter. These dark matter “halos” provide the scaffolding for all luminous structures in the universe, and their properties comprise an essential part of the current cosmological model. I review the internal properties of dark matter halos, focussing on the simple universal trends predicted by numerical simulations of structure formation. Simulations indicate that halos should all have roughly the same spherically averaged density profile and kinematic structure and predict simple distributions of shape, formation history, and substructure in density and kinematics, over an enormous range of halo mass and for all common variants of the concordance cosmology. I describe observational progress towards testing these predictions by measuring masses, shapes, profiles, and substructure in real halos using baryonic tracers or gravitational lensing. An important property of simulated halos (possibly the most important property) is their dynamical “age”, or degree of internal relaxation. I review recent gravitational lensing studies of galaxy clusters which will measure substructure and relaxation in a large sample of individual cluster halos, producing quantitative measures of age that are well matched to theoretical predictions.

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