Modeling the gravitational potential of a cosmological dark matter halo with stellar streams

@article{Sanderson2016ModelingTG,
  title={Modeling the gravitational potential of a cosmological dark matter halo with stellar streams},
  author={Robyn E. Sanderson and Johanna Hartke and Amina Helmi},
  journal={arXiv: Astrophysics of Galaxies},
  year={2016}
}
Stellar streams result from the tidal disruption of satellites and star clusters as they orbit a host galaxy, and can be very sensitive probes of the gravitational potential of the host system. We select and study narrow stellar streams formed in a Milky-Way-like dark matter halo of the Aquarius suite of cosmological simulations, to determine if these streams can be used to constrain the present day characteristic parameters of the halo's gravitational potential. We find that orbits integrated… Expand

Figures and Tables from this paper

The Density Structure of Simulated Stellar Streams
Simulations are run with and without a normal cold dark matter sub-halo population below 4x10^8 M_sun to examine the role of the lower mass sub-halos in the creation of density variations, "gaps",Expand
The Structural and Kinematic Evolution of Central Star Clusters in Dwarf Galaxies and Their Dependence on Dark Matter Halo Profiles
Through a suite of direct N-body simulations, we explore how the structural and kinematic evolution of a star cluster located at the center of a dwarf galaxy is affected by the shape of its host'sExpand
Fitting the density substructure of the stellar halo with MilkyWay@home.
We propose and test a method for applying statistical photometric parallax to main sequence turn off (MSTO) stars in the Sloan Digital Sky Survey (SDSS). Using simulated data, we show that if ourExpand
Better Galactic Mass Models through Chemistry
With the upcoming release of the Gaia catalog and the many multiplexed spectroscopic surveys on the horizon, we are rapidly moving into a new data-driven era in the study of the Milky Way’s stellarExpand
The mass of our Milky Way
We perform an extensive review of the numerous studies and methods used to determine the total mass of the Milky Way. We group the various studies into seven broad classes according to their modelingExpand
Gravitational potential from small-scale clustering in action space: application to Gaia Data Release 2
Most measurements of mass in Astronomy that use kinematics of stars or gas rely on assumptions of equilibrium that are often hard to verify. Instead, we develop a novel idea that uses the clusteringExpand
A cold stellar stream in Pegasus
We report the serendipitous discovery of a stellar stream in the constellation Pegasus in the south Galactic hemisphere. The stellar stream was detected using the SDSS Data Release 14 by means of aExpand
Evidence for an Intermediate-mass Milky Way fromGaiaDR2 Halo Globular Cluster Motions
We estimate the mass of the Milky Way (MW) within 21.1 kpc using the kinematics of halo globular clusters (GCs) determined by Gaia. The second Gaia data release (DR2) contained a catalogue ofExpand
An orbit fit to likely Hermus Stream stars
We selected blue horizontal branch (BHB) stars within the expected distance range and sky position of the Hermus Stream from Data Release 10 of the Sloan Digital Sky Survey. We identify a movingExpand
The Hipparcos–Gaia Catalog of Accelerations
This paper presents a cross-calibrated catalog of Hipparcos and Gaia astrometry to enable their use in measuring changes in proper motion, i.e., accelerations in the plane of the sky. The finalExpand
...
1
2
...

References

SHOWING 1-10 OF 48 REFERENCES
Modeling Tidal Streams in Evolving Dark Matter Halos
We explore whether stellar tidal streams can provide information on the secular, cosmological evolution of the Milky Way's gravitational potential and on the presence of subhalos. We carry outExpand
Stellar Streams as Probes of Dark Halo Mass and Morphology: A Bayesian Reconstruction
Tidal streams provide a powerful tool by means of which the matter distribution of the dark matter haloes of their host galaxies can be studied. However, the analysis is not straightforward becauseExpand
Building up the stellar halo of the Galaxy
We study numerical simulations of satellite galaxy disruption in a potential resembling that of the Milky Way. Our goal is to assess whether a merger origin for the stellar halo would leaveExpand
INFERRING THE GRAVITATIONAL POTENTIAL OF THE MILKY WAY WITH A FEW PRECISELY MEASURED STARS
The dark matter halo of the Milky Way is expected to be triaxial and filled with substructure. It is hoped that streams or shells of stars produced by tidal disruption of stellar systems will provideExpand
Milky Way Mass and Potential Recovery Using Tidal Streams in a Realistic Halo
We present a new method for determining the Galactic gravitational potential based on forward modeling of tidal stellar streams. We use this method to test the performance of smooth and staticExpand
Tracing Galaxy Formation with Stellar Halos. I. Methods
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 process using aExpand
Galactic stellar haloes in the CDM model
We present six simulations of galactic stellar haloes formed by the tidal disruption of accreted dwarf galaxies in a fully cosmological setting. Our model is based on the Aquarius project, a suite ofExpand
VELOCITY TRENDS IN THE DEBRIS OF SAGITTARIUS AND THE SHAPE OF THE DARK-MATTER HALO OF THE GALAXY
Recently, radial velocities have been measured for a large s ample of M giants from the 2MASS catalog, selected to be part of the Sgr dwarf leading and trailing streams. Here we present a comparisonExpand
Great Circle Tidal Streams: Evidence for a Nearly Spherical Massive Dark Halo around the Milky Way
An all-high-latitude sky survey for cool carbon giant stars in the Galactic halo has revealed 75 such stars, of which the majority are new detections. Of these, more than half are clustered on aExpand
Substructure in the stellar halos of the aquarius simulations
We characterize the substructure in the simulated stellar halos of Cooper et al. which were formed by the disruption of satellite galaxies within the cosmological N-body simulations of galactic halosExpand
...
1
2
3
4
5
...