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A universal angular momentum profile for galactic halos
James S. Bullock, Avishai Dekel, Tsafrir S. Kolatt +4
[Abridged] We study the angular-momentum profiles of a statistical sample of halos drawn from a high-resolution N-body simulation of the LCDM cosmology. We find that the cumulative…
Spin Profile of Galactic Halos and Disk Formation
A. Dekel, J. S. Bullock, C. Porciani +4
We summarize recent developments in the study of the origin of halo spin profiles and preliminary implications on disk formation. The specific angular-momentum distributions within…
Interaction rates of dark-matter halos and subhalos
Tsafrir S. Kolatt, James S. Bullock, Yair Sigad +4
[Abridged] The interaction rates of dark-matter halos and subhalos, are computed using high-resolution cosmological N-body simulations of the Lambda-CDM model. Although the number…
Resolving the Structure of Cold Dark Matter Halos II
Anatoly Klypin, Andrey V. Kravtsov, James Bullock +1
We study the effects of mass and force resolution on the density profiles of galaxy-size Cold Dark Matter (CDM) halos in a flat, low-density cosmological model with vacuum energy.…
Numerical Simulations in Cosmology III: Dark Matter Halos
Anatoly Klypin
Properties of dark matter halos are reviewed. Taken from different publications, we present results on (1) the mass and velocity functions, (2) density and velocity profiles, and (…
Numerical Simulations in Cosmology II: Spatial and Velocity Biases
Anatoly Klypin
We give a summary of recent results on spatial and velocity biases in cosmological models. Progress in numerical techniques made it possible to simulate halos in large volumes with…
Numerical Simulations in Cosmology I: Methods
Anatoly Klypin
This lecture gives a short introduction to different methods used in cosmology. The focus is on major features of N-body simulations: equations, main numerical techniques, effects…
Velocity and Mass Functions of Galactic Halos: Evolution and Environmental Dependence
Yair Sigad, Tsafrir S. Kolatt, James S. Bullock +4
We study the distribution functions of mass and circular velocity for dark matter halos in N-body simulations of the CDM cosmology, addressing redshift and environmental depende…
Simulated Cluster Archive: A Computational Catalog of X-Ray Clusters in a Lambda-CDM Universe
Michael L. Norman, Greg Daues, Erik Nelson +4
We have simulated the evolution of a large sample of X-ray clusters in a Lambda-CDM universe at high spatial resolution using adaptive mesh refinement and placed the results in an…
Merging history as a function of halo environment
Stefan Gottloeber, Anatoly Klypin, Andrey Kravtsov
According to the hierarchical scenario, galaxies form via merging and accretion of small objects. Using N-body simulations, we study the frequency of merging events in the history…
Formation and evolution of disk galaxies within cold dark matter halos
V. Avila-Reese, C. Firmani, A. Klypin +1
We present results of extensive model calculations of disk galaxy evolution within an hierarchical inside-out formation scenario. We first compare properties of the dark halos iden…