Oxyurid infestation of the breast

Rix, G.H.; Khalil, Khaoula; McBrien, M. P.; Al-Rufaie, H K

doi:10.1016/s0960-9776(97)90000-x

Cited by 1 publication

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“…The existence of a dark matter halo has been accepted for ellipticals only relatively recently (e.g. Kochanek et al 1995;Rix et al 1997). These studies found that while the stellar content dominates the central parts of galaxies, at distances larger than the effective radius the dark matter halo dominates the total mass inventory.…”

Section: Modeling the Various Cluster Mass Componentsmentioning

confidence: 99%

Cluster lenses

Kneib

Natarajan

2011

Astron Astrophys Rev

270

239

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Clusters of galaxies are the most recently assembled, massive, bound structures in the Universe. As predicted by General Relativity, given their masses, clusters strongly deform space-time in their vicinity. Clusters act as some of the most powerful gravitational lenses in the Universe. Light rays traversing through clusters from distant sources are hence deflected, and the resulting images of these distant objects therefore appear distorted and magnified. Lensing by clusters occurs in two regimes, each with unique observational signatures. The strong lensing regime is characterized by effects readily seen by eye, namely, the production of giant arcs, multiple images, and arclets. The weak lensing regime is characterized by small deformations in the shapes of background galaxies only detectable statistically. Cluster lenses have been exploited successfully to address several important current questions in cosmology: (i) the study of the lens(es)-understanding cluster mass distributions and issues pertaining to cluster formation and evolution, as well as constraining the nature of dark matter; (ii) the study of the lensed objects-probing the properties of the background lensed galaxy population-which is statistically at higher redshifts and of lower intrinsic luminosity thus enabling the probing of galaxy formation at the earliest times right up to the Dark Ages; and (iii) the study of the geometry of the Universe-as the strength of lensing depends on the ratios of angular diameter distances between the lens, source and observer, lens deflections are sensitive to the

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Section: Modeling the Various Cluster Mass Componentsmentioning

confidence: 99%