Academic
Publications
The Structure of Cold Dark Matter Halos

The Structure of Cold Dark Matter Halos,10.1086/177173,Astrophysical Journal,Julio F. Navarro,Carlos S. Frenk,Simon D. M. White

The Structure of Cold Dark Matter Halos   (Citations: 635)
BibTex | RIS | RefWorks Download
We use N-body simulations to investigate the structure of dark halos in the standard Cold Dark Matter cosmogony. Halos are excised from simulations of cosmologically representative regions and are resimulated individually at high resolution. We study objects with masses ranging from those of dwarf galaxy halos to those of rich galaxy clusters. The spherically averaged density profiles of all our halos can be fit over two decades in radius by scaling a simple ``universal'' profile. The characteristic overdensity of a halo, or equivalently its concentration, correlates strongly with halo mass in a way which reflects the mass dependence of the epoch of halo formation. Halo profiles are approximately isothermal over a large range in radii, but are significantly shallower than $r^{-2}$ near the center and steeper than $r^{-2}$ near the virial radius. Matching the observed rotation curves of disk galaxies requires disk mass-to-light ratios to increase systematically with luminosity. Further, it suggests that the halos of bright galaxies depend only weakly on galaxy luminosity and have circular velocities significantly lower than the disk rotation speed. This may explain why luminosity and dynamics are uncorrelated in observed samples of binary galaxies and of satellite/spiral systems. For galaxy clusters, our halo models are consistent both with the presence of giant arcs and with the observed structure of the intracluster medium, and they suggest a simple explanation for the disparate estimates of cluster core radii found by previous authors. Our results also highlight two shortcomings of the CDM model. CDM halos are too concentrated to be consistent with the halo parameters inferred for dwarf irregulars, and the predicted abundance of galaxy halos is larger than the observed abundance of galaxies.
Journal: Astrophysical Journal - ASTROPHYS J , vol. 462, 1995
Cumulative Annual
View Publication
The following links allow you to view full publications. These links are maintained by other sources not affiliated with Microsoft Academic Search.
    • ...White (NFW) halo density profile [77], and F collectively denotes the primary annihilation mode (e.g., τ + τ − , etc.)...

    Shaaban Khalilet al. Right-handed sneutrino dark matter in supersymmetric B  −  L model

    • ...For simplicity, we assume a standard NFW density profile [65, 66] for...
    • ...characteristic of ground-based Atmospheric Cerenkov Telescopes (ACTs), typical values of ¯ J range from 10 3 for the NFW profile [65, 66], to about 10 5 for the profile of Moore,...

    Hao Zhanget al. Effective dark matter model: relic density, CDMS II, Fermi LAT and LHC

    • ...[88]) for flat rotation curves below in the subsection 3.3...
    • ...We will use this relation for a system which is not vacuum, however beyond the galactic bulge, as usual within the analysis of rotation curves in relation with universal density profiles [35, 88]...
    • ...This is usually analysed in the context of universal halo profiles, whereas a halo of non-hadronic, dark matter is assumed [88]...
    • ...Dark-matter in the sense of non-Newtonian dynamics shall appear as a consequence of the scalar field, related to the dark-matter profile [88]...
    • ...It gives the halo structure in a way analogous to the Navarro-Frenk-White (NFW) profile with scale radii rs = a [88]...

    Nils M. Bezares-Roderet al. Scalar field pressure in induced gravity with Higgs potential and dark...

    • ...Rotation curve observations suggest a rather cored prole [24, 25], with a at behaviour at the centre, whereas numerical simulations predict more cuspy proles in the innermost region of the Galactic centre (see Kravtov et al. [25], Navarro-Frenk-White (NFW) [26] and Moore et al. [27] as well as the recent Via Lactea and AQUARIUS simulations [28, 29])...

    Sarah Andreaset al. Neutrinos from Inert Doublet dark matter

    • ...The formation of these cosmological structures have been investigated both observationally and in numerical simulations, which have confirmed the existence of a universal mass profile [1]...

    Ole Host. Measurement of the dark matter velocity anisotropy profile in galaxy c...

Sort by: