A UNIVERSAL MODEL FOR HALO CONCENTRATIONS

Are mergers responsible for universal halo properties?

N -body simulations of Cold Dark Matter (CDM) have shown that, in this hierarchical structure formation model, dark matter halo properties, such as the density profile, the phase-space density profile, the distribution of axial ratio, the distribution of spin parameter, and the distribution of internal specific angular momentum follow ‘universal’ laws or distributions. Here we study the propert...

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investigating the feasibility of a proposed model for geometric design of deployable arch structures

deployable scissor type structures are composed of the so-called scissor-like elements (sles), which are connected to each other at an intermediate point through a pivotal connection and allow them to be folded into a compact bundle for storage or transport. several sles are connected to each other in order to form units with regular polygonal plan views. the sides and radii of the polygons are...

Noise-driven evolution in stellar systems: A universal halo profile

Using the theory describing the evolution of a galaxy halo due to stochastic fluctuations developed in the companion paper, we show that a halo quickly evolves toward the same self-similar profile, independent of its initial profile and concentration. The selfsimilar part of profile takes the form of a double power law with inner and outer exponents taking the values near −1.5 and −3 respective...

Arcs from a Universal Dark-Matter Halo Profile

Navarro, Frenk, & White have recently found numerically that the density profile of dark-matter halos can be described by a universal two-parameter function over a broad range of halo masses. The profile is singular, approaching the halo center with ρ ∝ r−1. It had been argued previously that radially distorted, gravitationally lensed images of background sources in galaxy clusters, so-called r...