OUR MILKY WAY AS A PURE-DISK GALAXY—A CHALLENGE FOR GALAXY FORMATION

@article{Shen2010OURMW,
  title={OUR MILKY WAY AS A PURE-DISK GALAXY—A CHALLENGE FOR GALAXY FORMATION},
  author={Juntai Shen and Robert Michael Rich and John Kormendy and Christian D. Howard and Roberto de Propris and Andrea Kunder},
  journal={The Astrophysical Journal},
  year={2010},
  volume={720}
}
Bulges are commonly believed to form in the dynamical violence of galaxy collisions and mergers. Here, we model the stellar kinematics of the Bulge Radial Velocity Assay (BRAVA) and find no sign that the Milky Way contains a classical bulge formed by scrambling pre-existing disks of stars in major mergers. Rather, the bulge appears to be a bar seen somewhat end-on, as hinted from its asymmetric boxy shape. We construct a simple but realistic N-body model of the Galaxy that self-consistently… Expand

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References

SHOWING 1-10 OF 45 REFERENCES
Kinematics of Extragalactic Bulges: Evidence that some Bulges are Really Disks
Recent wor& on the dynamics of galaxy bulges has been dominated by two themes. (1) Bulges share the richness in kinematic structure that is currently being discovered in elliptical galaxies. ThisExpand
Dynamics of the Galactic Bulge using planetary nebulae. (Thesis abstract).
Evidence for a bar at the center of the Milky Way triggered a renewed enthusiasm for dynamical modeling of the Galactic bar-bulge. Our goal is to compare the kinematics of a sample of tracers,Expand
DETECTION OF A PSEUDOBULGE HIDDEN INSIDE THE “BOX-SHAPED BULGE” OF NGC 4565
Numerical simulations show that box-shaped bulges of edge-on galaxies are not bulges: they are bars seen side-on. Therefore, the two components that are seen in edge-on Sb galaxies such as NGC 4565Expand
Kinematics At the Edge of the Galactic Bulge: Evidence for Cylindrical Rotation
We present new results from BRAVA, a large-scale radial velocity survey of the Galactic bulge, using M giant stars selected from the Two Micron All Sky Survey catalog as targets for the Cerro TololoExpand
The bulge radial velocity assay : Techniques and a rotation curve
We are undertaking a large-scale radial velocity survey of the Galactic bulge that uses M giant stars selected from the Two Micron All Sky Survey catalog as targets for the Cerro TololoExpand
The formation of disc galaxies in a ΛCDM universe
We study the formation of disc galaxies in a fully cosmological framework using adaptive mesh refinement simulations. We perform an extensive parameter study of the main subgrid processes thatExpand
Spiral arms, bar shape and bulge microlensing in the Milky Way
A new model for the luminosity distribution in the inner Milky Way is found, using a non-parametric penalized maximum-likelihood algorithm to deproject a dereddened COBE/ DIRBE L-band map of theExpand
A dynamical instability of bars in disk galaxies
STRONG, rapidly rotating, persistent bars readily form in numerical simulations of initially axisymmetric disk galaxies1–4. The global dynamical instability responsible for this behaviour is a greatExpand
The Formation of Galactic Bulges: Frontmatter
Part I. Introduction: What are galactic bulges? Part II. The Epoch of Bulge Formation: Origin of bulges Deep sub-mm surveys: High-z ULIRGs and the formation of spheroids Ages and metallicities forExpand
Three-dimensional Simulations of the Chemical and Dynamical Evolution of the Galactic Bulge
A three-dimensional, hydrodynamical, N-body model for the formation of the Galaxy is presented, with special attention paid to the formation of the bulge component. Since none of the previousExpand
...
1
2
3
4
5
...