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Redistributing hot gas around galaxies: do cool clouds signal a solution to the overcooling problem?
Tobias Kaufmann, James S. Bullock, Ariyeh H. Maller +2
We present a pair of high-resolution smoothed particle hydrodynamics (SPH) simulations that explore the evolution and cooling behavior of hot gas around Milky-Way size galaxies. Th…
Mergers and Disk Survival in LCDM
James S. Bullock, Kyle R. Stewart, Chris W. Purcell
Disk galaxies are common in our universe and this is a source of concern for hierarchical formation models like LCDM. Here we investigate this issue as motivated by raw merger stat…
Galaxy Mergers and Dark Matter Halo Mergers in LCDM: Mass, Redshift, and Mass-Ratio Dependence
Kyle R. Stewart, James S. Bullock, Elizabeth J. Barton +1
We employ a high-resolution LCDM N-body simulation to present merger rate predictions for dark matter halos and investigate how common merger-related observables for galaxies--such…
The Destruction of Thin Stellar Disks Via Cosmologically Common Satellite Accretion Events
Chris W. Purcell, Stelios Kazantzidis, James S. Bullock
Most Galaxy-sized systems (M_host ~ 10^12 M_sun) in the LCDM cosmology are expected to have accreted at least one satellite with a total mass M_sat ~ 10^11 M_sun = 3M_disk in the p…
A common mass scale for satellite galaxies of the Milky Way
Louis E. Strigari, James S. Bullock, Manoj Kaplinghat +4
The Milky Way has at least twenty-three known satellite galaxies that shine with luminosities ranging from about a thousand to a billion times that of the Sun. Half of these galaxi…
High-Redshift Galaxy Kinematics: Constraints on Models of Disk Formation
Brant E. Robertson, James S. Bullock
Integral field spectroscopy of galaxies at redshift z~2 has revealed a population of early-forming, rotationally-supported disks. These high-redshift systems provide a potentially…
Tracing Galaxy Formation with Stellar Halos II: Relating Substructure in Phase- and Abundance-Space to Accretion Histories
Kathryn V. Johnston, James S. Bullock, Sanjib Sharma +3
This paper explores the mapping between the observable properties of a stellar halo in phase- and abundance-space and the parent galaxy's accretion history in terms of the characte…
Cold Dark Matter Substructure and Galactic Disks
Stelios Kazantzidis, Andrew R. Zentner, James S. Bullock
We perform a set of high-resolution, dissipationless N-body simulations to investigate the influence of cold dark matter (CDM) substructure on the dynamical evolution of thin galac…
The Observatory for Multi-Epoch Gravitational Lens Astrophysics (OMEGA)
Leonidas A Moustakas, Adam J Bolton, Jeffrey T Booth +15
(abridged) The Observatory for Multi-Epoch Gravitational Lens Astrophysics (OMEGA) is a mission concept for a 1.5-m near-UV through near-IR space observatory that will be dedicated…
Hundreds of Milky Way Satellites? Luminosity Bias in the Satellite Luminosity Function
Erik J. Tollerud, James S. Bullock, Louis E. Strigari +1
We correct the observed Milky Way satellite luminosity function for luminosity bias using published completeness limits for the Sloan Digital Sky Survey DR5. Assuming that the spat…
The Metallicity of Diffuse Intrahalo Light
Chris W. Purcell, James S. Bullock, Andrew R. Zentner
We make predictions for the metallicity of diffuse stellar components in systems ranging from small spiral galaxies to rich galaxy clusters. We extend the formalism of Purcell et a…
LSST: from Science Drivers to Reference Design and Anticipated Data Products
Željko Ivezić, Steven M. Kahn, J. Anthony Tyson +310
(Abridged) We describe here the most ambitious survey currently planned in the optical, the Large Synoptic Survey Telescope (LSST). A vast array of science will be enabled by a sin…
The Assembly of Galaxy Clusters
Joel C. Berrier, Kyle R. Stewart, James S. Bullock +3
We study the formation of fifty-three galaxy cluster-size dark matter halos formed within a pair of cosmological LCDM N-body simulations, and track the accretion histories of clust…
A Candidate Brightest Proto-Cluster Galaxy at z = 3.03
Jeff Cooke, Elizabeth J. Barton, James S. Bullock +2
We report the discovery of a very bright (m_R = 22.2) Lyman break galaxy at z = 3.03 that appears to be a massive system in a late stage of merging. Deep imaging reveals multiple p…
Simulating the Gaseous Halos of Galaxies
Tobias Kaufmann, James S. Bullock, Ari Maller +1
Observations of local X-ray absorbers, high-velocity clouds, and distant quasar absorption line systems suggest that a significant fraction of baryons may reside in multi-phase, lo…
Merger Histories of Galaxy Halos and Implications for Disk Survival
Kyle R. Stewart, James S. Bullock, Risa H. Wechsler +2
We study the merger histories of galaxy dark matter halos using a high resolution LCDM N-body simulation. Our merger trees follow ~17,000 halos with masses M_0 = (10^11--10^13) Msu…
The Stellar Content of Galaxy Halos: A Comparison between LambdaCDM Models and Observations of M31
Andreea S. Font, Kathryn V. Johnston, Annette M. N. Ferguson +4
Recent observations have revealed that high surface-brightness, metal-rich debris is present over large regions of the Andromeda (M31) stellar halo. We use a set of numerical model…
The Most Dark Matter Dominated Galaxies: Predicted Gamma-ray Signals from the Faintest Milky Way Dwarfs
Louis E. Strigari, Savvas M. Koushiappas, James S. Bullock +4
We use kinematic data from three new, nearby, extremely low-luminosity Milky Way dwarf galaxies (Ursa Major II, Willman 1, and Coma Berenices) to constrain the properties of their…
Isolating Triggered Star Formation
Elizabeth J. Barton, Jacob A. Arnold, Andrew R. Zentner +2
Galaxy pairs provide a potentially powerful means of studying triggered star formation from galaxy interactions. We use a large cosmological N-body simulation coupled with a well-t…
Stellar populations across the NGC4244 truncated galactic disk
Roelof S. de Jong, A. C. Seth, D. J. Radburn-Smith +12
We use HST/ACS to study the resolved stellar populations of the nearby, nearly edge-on galaxy NGC4244 across its outer disk surface density break. The stellar photometry allows us…
On the morphologies, gas fractions, and star formation rates of small galaxies
Tobias Kaufmann, Coral Wheeler, James S. Bullock
We use a series of N-body/smoothed particle hydrodynamics simulations and analytic arguments to show that the presence of an effective temperature floor in the interstellar medium…
The accretion origin of the Milky Way's stellar halo
Eric F. Bell, Daniel B. Zucker, Vasily Belokurov +15
We have used data from the Sloan Digital Sky Survey (SDSS) Data Release 5 to explore the overall structure and substructure of the stellar halo of the Milky Way using about 4 milli…
Redefining the Missing Satellites Problem
Louis E. Strigari, James S. Bullock, Manoj Kaplinghat +3
Numerical simulations of Milky-Way size Cold Dark Matter (CDM) halos predict a steeply rising mass function of small dark matter subhalos and a substructure count that greatly outn…
Shredded Galaxies as the Source of Diffuse Intrahalo Light On Varying Scales
Chris W. Purcell, James S. Bullock, Andrew R. Zentner
We make predictions for diffuse stellar mass fractions in dark matter halos from the scales of small spiral galaxies to those of large galaxy clusters. We use an extensively-tested…