The radial velocity dispersion profile of the Galactic halo : constraining the density profile of the dark halo of the Milky Way

@article{Battaglia2005TheRV,
  title={The radial velocity dispersion profile of the Galactic halo : constraining the density profile of the dark halo of the Milky Way},
  author={Giuseppina Battaglia and Amina Helmi and Heather L. Morrison and Paul Harding and E. Olszewski and Mario L. Mateo and Kenneth C. Freeman and John E. Norris and Simon D. M. White Kapteyn Astronomical Institute and University of Arizona Astronomy Department and Case Western Reserve University Steward Observatory and University of Arizona Astronomy Department and University of Cambridge Department of AstronomyAstrophysics and The Australian National University and Mount Stromlo Carnegie Observatories and Pasadena},
  journal={Monthly Notices of the Royal Astronomical Society},
  year={2005},
  volume={364},
  pages={433-442}
}
We have compiled a new sample of 240 halo objects with accurate distance and radial velocity measurements, including globular clusters, satellite galaxies, field blue horizontal branch (FHB) stars and red giant stars from the Spaghetti survey. The new data lead to a significant increase in the number of known objects for Galactocentric radii beyond 50 kpc, which allows a reliable determination of the radial velocity dispersion profile out to very large distances. The radial velocity dispersion… Expand

Figures and Tables from this paper

Velocity Dispersion Profile of the Milky Way Halo
We present a spectroscopic sample of 910 distant halo stars from the Hypervelocity Star survey from which we derive the velocity dispersion profile of the Milky Way halo. The sample is a mix of 74%Expand
KINEMATICS OF THE STELLAR HALO AND THE MASS DISTRIBUTION OF THE MILKY WAY USING BLUE HORIZONTAL BRANCH STARS
Here we present a kinematic study of the Galactic halo out to a radius of ∼ 60 kpc, using 4664 blue horizontal branch (BHB) stars selected from the SDSS/SEGUE survey, to determine key dynamicalExpand
The velocity dispersion and mass profile of the Milky Way
We re-analyse the velocity-dispersion profile σ(r) at radii r > 10kpc in the Galactic stellar halo, recently derived by Battaglia et al., who concluded that, for a constant velocity anisotropy of theExpand
MAPPING THE GALACTIC HALO WITH BLUE HORIZONTAL BRANCH STARS FROM THE TWO-DEGREE FIELD QUASAR REDSHIFT SURVEY
We use 666 blue horizontal branch stars from the 2Qz Redshift Survey to map the Galactic halo in four dimensions (position, distance, and velocity). We find that the halo extends to at least 100 kpcExpand
Broken degeneracies: the rotation curve and velocity anisotropy of the Milky Way halo
We use distant blue horizontal branch stars with Galactocentric distances 16 < r < 48 kpc as kinematic tracers of the Milky Way dark halo. We model the tracer density as an oblate, power law embeddedExpand
THE MASS PROFILE OF THE GALAXY TO 80 kpc
The Hypervelocity Star Survey presents the currently largest sample of radial velocity measurements of halo stars out to 80 kpc. We apply spherical Jeans modeling to these data in order to derive theExpand
On the Shoulders of Giants: Properties of the Stellar Halo and the Milky Way Mass Distribution
Halo stars orbit within the potential of the Milky Way, and hence their kinematics can be used to understand the underlying mass distribution. However, the inferred mass distribution dependsExpand
Galactic googly: the rotation-metallicity bias in the inner stellar halo of the Milky Way
The first and second moments of stellar velocities encode important information about the formation history of the Galactic halo. However, due to the lack of tangential motion and inaccurateExpand
Rotation Curve of the Milky Way out to ~200 kpc
The rotation curve (RC) of our Galaxy, the Milky Way, is constructed starting from its very inner regions (few hundred parsecs) out to a large galactocentric distance of ~200 kpc using kinematicalExpand
The Mass Profile of the Milky Way to the Virial Radius from the Illustris Simulation
We use particle data from the Illustris simulation, combined with individual kinematic constraints on the mass of the Milky Way (MW) at specific distances from the Galactic Centre, to infer theExpand
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 48 REFERENCES
A Dynamical and Kinematic Model of the Galactic Stellar Halo and Possible Implications for Galaxy Formation Scenarios
We reanalyze the kinematics and dynamics of the system of blue horizontal-branch field (BHBF) stars in the Galactic halo (in particular the outer halo), fitting the kinematics with the model ofExpand
Cuspy dark matter haloes and the Galaxy
The microlensing optical depth to Baade's Window constrains the minimum total mass in baryonic matter within the Solar circle to be greater than ∼, assuming the inner Galaxy is barred with viewingExpand
Dark matter haloes within clusters
We examine the properties of dark matter haloes within a rich galaxy cluster using a high-resolution simulation that captures the cosmological context of a cold dark matter universe. The mass andExpand
The present and future mass of the Milky Way halo
A simple model for the Milky Way halo is presented. It has a flat rotation curve in the inner regions, but the density falls off sharply beyond an outer edge. This truncated, flat rotation curve (TF)Expand
The Mass of the Milky Way: Limits from a newly assembled set of halo objects
We set new limits on the mass of the Milky Way, making use of the latest kinematic information for Galactic satellites and halo objects. Our sample consists of 11 satellite galaxies, 137 globularExpand
Tidal radii of globular clusters and the mass of the Milky Way
Tidal radii of remote globular clusters (R GC ≥ 35 kpc) are used to provide constraints on the mass profile of the Milky Way galaxy that are independent of kinematic data. The available data areExpand
Mapping the Galactic Halo. VI. Spectroscopic Measures of Luminosity and Metallicity
We present our calibration of spectroscopic measures of luminosity and metallicity for halo giant candidates and give metallicities and distances for our first sample of spectroscopically confirmedExpand
Profiles of dark haloes: evolution, scatter and environment
We study dark-matter halo density profiles in a high-resolution N-body simulation of aCDM cosmology. Our statistical sample contains �5000 haloes in the range 10 11 10 14 h −1 M⊙ and the resolutionExpand
Blue Horizontal-Branch Stars in the Sloan Digital Sky Survey. II. Kinematics of the Galactic Halo
We carry out a maximum-likelihood kinematic analysis of a sample of 1170 blue horizontal-branch (BHB) stars from the Sloan Digital Sky Survey presented by Sirko and coworkers. Monte Carlo simulationsExpand
Mapping the Galactic Halo. I. The Spaghetti Survey
We describe a major survey of the Milky Way halo designed to test for kinematic substructure caused by destruction of accreted satellites. We use the Washington photometric system to identify haloExpand
...
1
2
3
4
5
...