A Universal Density Profile for Dark and Luminous Matter?
نویسندگان
چکیده
منابع مشابه
A Universal Density Profile for Dark and Luminous Matter?
We explore similarities in the luminosity distribution of early type galaxies and the mass profiles of ΛCDM halos. The spatial structure of these systems may be accurately described by a simple law where the logarithmic slope of the projected density is a power law of radius; the Sérsic law. We show that this law provides a significantly better fit than a three-parameter generalization of the N...
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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...
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We study the diversity of the density profiles of dark matter halos based on a large set of high-resolution cosmological simulations of 256 3 particles. The cosmological models include four scale-free models and three representative cold dark matter models. The simulations have good force resolution. In each cosmological model, there are about 400 massive halos which have more than 10 4 particl...
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Dark-matter halos show a universal density profile with a scaling such that less massive systems are typically denser. This mass-density relation is well described by a proportionality between the characteristic density of halos and the mean cosmic density at halo formation time. It has recently been shown that this proportionality could be the result of the following simple evolutionary pictur...
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We perform a series of high – resolution N-body simulations designed to examine the density profiles of dark matter halos. From 12 simulated halos ranging the mass of 2 × 10 ∼ 5 × 10hM⊙ (represented by ∼ 1 million particles within the virial radius), we find a clear systematic correlation between the halo mass and the slope of the density profile at 1% of the virial radius, in addition to the v...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2005
ISSN: 0004-637X,1538-4357
DOI: 10.1086/430636