Gas Rich Mergers in Disk Formation

  title={Gas Rich Mergers in Disk Formation},
  author={Chris B. Brook and Vincent Veilleux and Daisuke Kawata and Hugo Martel and Brad K. Gibson},
  journal={arXiv: Astrophysics},
In order to explain disk galaxy formation within the hierarchical structure for- mation, it seems that gas rich mergers must play an important role. We review here our previous studies which have shown the importance of mergers at high redshift being gas rich, in the formation of both the stellar halo and thick disk components of disk galaxies. Regulation of star formation in the building blocks of our galaxy is required to form a low mass low metallicity stellar halo. This regulation results… Expand
Gas-rich Mergers in LCDM: Disk Survivability and the Baryonic Assembly of Galaxies
We use N-body simulations and observationally normalized relations between dark matter halo mass, stellar mass, and cold gas mass to derive robust expectations about the baryonic content of majorExpand
Merger Histories of Galaxy Halos and Implications for Disk Survival
We study the merger histories of galaxy dark matter halos using a high-resolution ΛCDM N-body simulation. Our merger trees follow ~17,000 halos with masses M0 = 1011–1013 h−1 M☉ at z = 0 and trackExpand
Elemental abundance survey of the Galactic thick disc
We have performed an abundance analysis for F- and G- dwarfs of the Galactic thick-disc component. A sample of 176 nearby (d≤ 150 pc) thick-disc candidate stars was chosen from the HipparcosExpand


The Kinematics of Thick Disks in Nine External Galaxies
We present kinematic measurements of thin and thick disk components in a sample of nine edge-on galaxies. We extract stellar and ionized gas rotation curves at and above the galaxies' midplanes usingExpand
The Formation of a Realistic Disk Galaxy in Λ-dominated Cosmologies
We simulate the formation of a realistic disk galaxy within the hierarchical scenario of structure formation and study its internal properties to the present epoch. We use a set of smoothed particleExpand
Galaxy Formation: Cold Dark Matter, Feedback, and the Hubble Sequence
TreeSPH simulations of galaxy formation in a standard Λ cold dark matter cosmology, including star formation and the effects of energetic stellar feedback processes and of a metagalactic UV field,Expand
The Emergence of the Thick Disk in a Cold Dark Matter Universe
The disk galaxy simulated using our chemodynamic galaxy formation code, GCD+, is shown to have a thickdisk component. This is evidenced by the velocity dispersion versus age relation for solarExpand
Compositions of halo clusters and the formation of the galactic halo
A method of abundance determination based on reddening-independent properties of low-resolution spectral scans is described and applied to 177 red giants in 19 globular clusters, most of which are atExpand
Dissipational galaxy formation. II - Effects of star formation
Numerical simulations of hierarchical galaxy formation, including gasdynamics, star formation, and supernova feedback, are presented. The simulations model the collapse of isolated constant-densityExpand
Stellar halo constraints on simulated late-type galaxies
How do late-type spiral galaxies form within the context of a cold dark matter cosmology? We contrast N-body, smoothed particle hydrodynamical simulations of galaxy formation that employ twoExpand
Implementing feedback in simulations of galaxy formation: a survey of methods
We present a detailed description, and examine the performance of, a number of different approaches to modeling feedback in simulations of galaxy formation. Gasdynamic forces are evaluated usingExpand
Galaxy Morphologies in the Hubble Ultra Deep Field: Dominance of Linear Structures at the Detection Limit
Galaxies in the Hubble Ultra Deep Field (UDF) larger than 10 pixels (03) have been classified according to morphology, and their photometric properties are presented. There are 269 spiral, 100Expand
Dissipational Galaxy Formation. I. Effects of Gasdynamics
Numerical simulations of hierarchical galaxy formation including gasdynamics are presented. These simulations are conducted using a new, general-purpose programs for evolving self-gravitating systemsExpand