The effects of dynamical substructure on Milky Way mass estimates from the high-velocity tail of the local stellar halo

@article{Grand2019TheEO,
  title={The effects of dynamical substructure on Milky Way mass estimates from the high-velocity tail of the local stellar halo},
  author={Robert J. J. Grand and Alis J. Deason and Simon D. M. White and Christine M. Simpson and Facundo A. G'omez and Federico Marinacci and R{\"u}ediger Pakmor},
  journal={Monthly Notices of the Royal Astronomical Society: Letters},
  year={2019}
}
We investigate the impact of dynamical streams and substructure on estimates of the local escape speed and total mass of Milky-Way-mass galaxies from modelling the high-velocity tail of local halo stars. We use a suite of high-resolution magnetohydrodynamical cosmological zoom-in simulations that resolve phase space substructure in local volumes around solar-like positions. We show that phase space structure varies significantly between positions in individual galaxies and across the suite… Expand
View PDF on arXiv
21 Citations
Highly Influential Citations
5
Background Citations
8
Methods Citations
4
Results Citations
1

Figures from this paper

21 Citations

Citation Type

Citation Type

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 modeling… Expand
The milky way total mass profile as inferred from Gaia DR2
We determine the Milky Way (MW) mass profile inferred from fitting physically motivated models to the Gaia DR2 Galactic rotation curve and other data. Using various hydrodynamical simulations of… Expand
On the Absence of Dark Matter in Dwarf Galaxies Surrounding the Milky Way
This paper presents an alternative scenario to explain the observed properties of the Milky Way dwarf Spheroidals (MW dSphs). We show that instead of resulting from large amounts of dark matter (DM),… Expand
Gas accretion and galactic fountain flows in the Auriga cosmological simulations: angular momentum and metal redistribution
Using a set of 15 high-resolution magnetohydrodynamic cosmological simulations of Milky Way formation, we investigate the origin of the baryonic material found in stars at redshift zero. We find… Expand
Simulating cosmological substructure in the solar neighbourhood
We explore the predictive power of cosmological, hydrodynamical simulations for stellar phase-space substructure and velocity correlations with the auriga simulations and aurigaia mock Gaia… Expand
The orbital phase space of contracted dark matter haloes
We study the orbital phase-space of dark matter (DM) halos in the AURIGA suite of cosmological hydrodynamics simulations of Milky Way analogues. We characterise halos by their spherical action… Expand
Determination of the escape velocity of the Milky Way using a halo sample selected based on proper motion
The {\it Gaia} mission has provided the largest catalogue ever of sources with tangential velocity information. However, using this catalogue for dynamical studies is difficult because most of the… Expand
Discovery of Magellanic Stellar Debris in the H3 Survey
We report the discovery of 15 stars in the H3 survey that lie, in projection, near the tip of the trailing gaseous Magellanic Stream (MS). The stars have Galactocentric velocities $ 37.5$ kpc, $-$350… Expand
Constraining the Milky Way Mass Profile with Phase-space Distribution of Satellite Galaxies
We estimate the Milky Way (MW) halo properties using satellite kinematic data including the latest measurements from Gaia DR2. With a simulation-based 6D phase-space distribution function (DF) of… Expand
Synthetic catalog of black holes in the Milky Way
We present an open-access database which includes a synthetic catalog of black holes in the Milky Way. To calculate evolution of single and binary stars we used updated population synthesis code… Expand
...
1
2
3
...

References

SHOWING 1-10 OF 40 REFERENCES
The Auriga stellar haloes: connecting stellar population properties with accretion and merging history
We examine the stellar haloes of the Auriga simulations, a suite of 30 cosmological magnetohydrodynamical high-resolution simulations of Milky Way-mass galaxies performed with the moving-mesh code… Expand
The local high-velocity tail and the Galactic escape speed
We model the fastest moving (⁠v tot >300kms −1 vtot>300kms−1 ⁠) local (D ≲ 3 kpc) halo stars using cosmological simulations and six-dimensional Gaia data. Our approach is to use our knowledge of… Expand
The RAVE survey : the Galactic escape speed and the mass of the Milky Way
We made new estimates of the Galactic escape speed at various Galactocentric radii using the latest data release of the RAdial Velocity Experiment (RAVE DR4). Compared to previous studies we have a… Expand
The mass of the Milky Way from satellite dynamics
We present and apply a method to infer the mass of the Milky Way (MW) by comparing the dynamics of MW satellites to those of model satellites in the EAGLE cosmological hydrodynamics simulations. A … Expand
The merger that led to the formation of the Milky Way’s inner stellar halo and thick disk
TLDR
It is demonstrated that the inner halo of the Galaxy is dominated by debris from an object that at infall was slightly more massive than the Small Magellanic Cloud, and which the authors refer to as Gaia–Enceladus, which is in line with the results of galaxy formation simulations. Expand
Connecting the Milky Way potential profile to the orbital time-scales and spatial structure of the Sagittarius Stream
Recent maps of the halo using RR Lyrae from Pan-STARRS1 depict the spatial structure of the Sagittarius stream, showing the leading and trailing stream apocentres differ in Galactocentric radius by a… Expand
Streams in the Aquarius stellar haloes
We use the very high resolution, fully cosmological simulations from the Aquarius Project, coupled to a semi-analytical model of galaxy formation, to study the phase-space distribution of halo stars… Expand
A box full of chocolates: The rich structure of the nearby stellar halo revealed by Gaia and RAVE
The hierarchical structure formation model predicts that stellar halos should form, at least partly, via mergers. If this was a predominant formation channel for the Milky Way's halo, imprints of… Expand
The phase-space structure of cold dark matter haloes : insights into the Galactic halo
We study the formation of the halo of the Milky Way in a A-cold dark matter (ACDM) cosmology by scaling down a high-resolution simulation of the formation of a cluster of galaxies. We determine how… Expand
The Auriga Project: the properties and formation mechanisms of disc galaxies across cosmic time
We introduce a suite of 30 cosmological magneto-hydrodynamical zoom simulations of the formation of galaxies in isolated Milky Way mass dark haloes. These were carried out with the moving mesh code… Expand
...
1
2
3
4
...