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}
}
• R. Grand, +4 authors R. Pakmor
• Published 2019
• Physics
• Monthly Notices of the Royal Astronomical Society: Letters
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

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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 codeExpand
The local high-velocity tail and the Galactic escape speed
• A. Deason, +4 authors R. Pakmor
• Physics
• Monthly Notices of the Royal Astronomical Society
• 2019
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 ofExpand
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 aExpand
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
• Physics, Medicine
• Nature
• 2018
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 aExpand
Streams in the Aquarius stellar haloes
• Physics
• 2013
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 starsExpand
A box full of chocolates: The rich structure of the nearby stellar halo revealed by Gaia and RAVE
• Physics
• 2016
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 ofExpand
The phase-space structure of cold dark matter haloes : insights into the Galactic halo
• Physics
• 2003
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 howExpand
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 codeExpand