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Concentrations and Assembly Histories of Dark Matter Halos
Risa H. Wechsler, James S. Bullock, J. R. Primack +2
We study the relation between the density profiles of dark matter halos and their mass assembly histories, using a statistical sample of halos in a high-resolution N-body simulatio…
Tilted CDM versus WDM in the Subgalactic Scuffle
James S. Bullock
Although the currently favored cold dark matter plus cosmological constant model (LCDM) has proven to be remarkably successful on large scales, on subgalactic scales it faces some…
Angular Momentum Profiles of Warm Dark Matter Halos
James S. Bullock, Andrey V. Kravtsov, Pedro Colin
We compare the specific angular momentum profiles of virialized dark halos in cold dark matter (CDM) and warm dark matter (WDM) models using high-resolution dissipationless simulat…
Dark Matter Properties and Halo Central Densities
S. M. Khairul Alam, James S. Bullock, David H. Weinberg
Using an analytic model calibrated against numerical simulations, we calculate the central densities of dark matter halos in a ``conventional'' cold dark matter model with a cosmol…
Shapes of dark matter halos
James S. Bullock
I present an analysis of the density shapes of dark matter halos in LCDM and LWDM cosmologies. The main results are derived from a statistical sample of galaxy-mass halos drawn fro…
Galaxy Halo Occupation at High Redshift
James S. Bullock, Risa H. Wechsler, Rachel S. Somerville
We discuss how current and future data on the clustering and number density of z~3 Lyman-break galaxies (LBGs) can be used to constrain their relationship to dark matter haloes. We…
The origin of angular momentum in dark matter halos
M. Vitvitska, A. A. Klypin, A. V. Kravtsov +3
We propose a new explanation for the origin of angular momentum in galaxies and their dark halos, in which the halos obtain their spin through the cumulative acquisition of angular…
Interpreting Debris from Satellite Disruption In External Galaxies
Kathryn V. Johnston, Penny D. Sackett, James S. Bullock
We examine the detectability and interpretation of debris trails caused by satellite disruption in external galaxies using semi-analytic approximations for the dependence of stream…