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Phase-Space Distributions of Chemical Abundances in Milky Way-type Galaxy Halos
Andreea S. Font, Kathryn V. Johnston, James S. Bullock +1
[Abridged] Motivated by upcoming data from astrometric and spectroscopic surveys of the Galaxy, we explore the chemical abundance properties and phase-space distributions in hierar…
The Dependence of Halo Clustering on Halo Formation History, Concentration, and Occupation
Risa H. Wechsler, Andrew R. Zentner, James S. Bullock +2
We investigate the dependence of dark matter halo clustering on halo formation time, density profile concentration, and subhalo occupation number, using high-resolution numerical s…
Dark-Matter Halos of Early-Type Galaxies
Philip J. Humphrey, David A. Buote, Fabio Gastaldello +4
Cosmological simulations of galaxy formation predict a universal form for the mass profile of dark matter (DM) halos from cluster to galaxy scales. Remarkably few interesting const…
Temperature and Dark Matter profiles of Galaxy Groups
F. Gastaldello, D. Buote, P. Humphrey +4
The Chandra and XMM data for a sample of 19 relaxed groups/poor clusters, covering the temperature range 1-3 keV and selected to have the best available data, reveal a remarkable s…
X-ray constraints on the dark matter profile of a very relaxed cluster of galaxies
L. Zappacosta, D. A. Buote, F. Gastaldello +4
We have analyzed an XMM-Newton observation of the cluster Abell 2589. Apart from a low-level asymmetry in the central region, the cluster appears very relaxed and does not show pre…
The Shape of Dark Matter Halos: Dependence on Mass, Redshift, Radius, and Formation
Brandon Allgood, Ricardo A. Flores, Joel R. Primack +4
Using six high resolution dissipationless simulations with a varying box size in a flat LCDM universe, we study the mass and redshift dependence of dark matter halo shapes for M_vi…
Mass distribution of spiral galaxies from characteristics of spiral structure: Constraints on galaxy formation models
Marc S. Seigar, Aaron J. Barth, James Bullock +1
Recently, it has been shown that a correlation exists between the rate of shear and the spiral arm pitch angle in disk galaxies. The rate of shear depends upon the shape of the rot…
Chemical Abundance Distributions of Galactic Halos and their Satellite Systems in a Lambda CDM Universe
Andreea S. Font, Kathryn V. Johnston, James S. Bullock +1
We present a cosmologically motivated model for the hierachical formation of the stellar halo which includes a semi-analytic treatment of galactic chemical enrichment coupled to nu…
Tracing Galaxy Formation with Stellar Halos I: Methods
James S. Bullock, Kathryn V. Johnston
If the favored hierarchical cosmological model is correct, then the Milky Way system should have accreted ~100-200 luminous satellite galaxies in the past \~12 Gyr. We model this p…
A Merger-Driven Scenario for Cosmological Disk Galaxy Formation
Brant Robertson, James S. Bullock, Thomas J. Cox +4
(Abridged) The violent hierarchical nature of the LCDM cosmology poses serious difficulties for the formation of disk galaxies. To help resolve these issues, we describe a new, mer…
Observational Gamma-ray Cosmology
Joel R. Primack, James S. Bullock, Rachel S. Somerville
We discuss how measurements of the absorption of gamma-rays from GeV to TeV energies via pair production on the extragalactic background light (EBL) can probe important issues in g…
Lambda-Cold Dark Matter, Stellar Feedback, and the Galactic Halo Abundance Pattern
Brant Robertson, James S. Bullock, Andreea S. Font +2
(Abridged) The hierarchical formation scenario for the stellar halo requires the accretion and disruption of dwarf galaxies, yet low-metallicity halo stars are enriched in alpha-el…