High-resolution N-body simulations are used to examine the power spectrum\ndependence of the concentration of galaxy-sized dark matter halos. It is found\nthat dark halo concentrations depend on the amplitude of mass fluctuations as\nwell as on the ratio of power between small and virial mass ...
The dark matter halo concentration and stellar initial mass function of a CASSOWARY groupdark mattergalaxies: groups: generalgalaxies: kinematics and dynamicsgalaxies: stellar contentgravitational lensing: strongWe exploit the group environment of the CAmbridge Sloan Survey Of Wide ARcs in the skY (...
The concentration of a dark matter (DM) halo — a measure of how much of the dark matter is concentrated toward its center — directly determines how efficiently that halo can act as a gravitational lens. In comparing the distribution of DM halo concentrations measured from a recent N-body ...
We find that halo density profiles are universal over the entire mass range and are well described by simple two-parameter fitting formulae4,5. Halo mass and concentration are tightly related in a way that depends on cosmology and on the nature of the dark matter. For a fixed mass, the ...
The redshift evolution of Λ cold dark matter halo parameters: concentration, spin and shape We present a detailed study of the redshift evolution of dark matter halo structural parameters in a cold dark matter cosmology. We study the mass and red... Muñoz-Cuartas J. C.,AV Macciò,S Go...
In contrast with previous results, we find that these systems are only similar to 0.1 dex more overconcentrated than similar-mass haloes from dark matter simulations; the concentration of a halo with M-200 = 10(14) M-circle dot is log c = 0.78 +/- 0.05, while simulations of haloes ...
We compare the central mass concentration of cold dark matter (CDM) halos found in cosmological N-body simulations with constraints derived from the Milky Way disk dynamics and from the Tully-Fisher relation. For currently favored values of the cosmological parameters (Ω~0.3 Λ=1-Ω~0.7 h~0.7...
withα≈1.55±0.05andthatthescatteraroundthemeanrelationinpartreflectsthescatterinthehaloconcentration-massrelation.Keywords:Cosmology:Theory–Galaxies:Active–Galaxies:Evolution–Galaxies:Formation–Hydrodynamics–Galaxies:Quasars:General1INTRODUCTIONAlmostallmassivegalaxiesarethoughttocontainacentralsupermassive...
thought, in order for it to keep a gravitational hold on these far-off stars. Dark matter is a hypothetical type of matter that is thought to make up more than 85 percent of the universe. Every galaxy is thought to be held together by a local concentration, or halo, of...
If this LCDM theory is correct, then we know, within a certain range of uncertainty, which dark matter halo the Milky Way (MW) has, which dark matter halo the Large Magellanic Cloud (LMC) has, and which dark matter halo the Small Magellanic Cloud (SMC) has. The uncertainties on the da...