HALO7D I. The Line-of-sight Velocities of Distant Main-sequence Stars in the Milky Way Halo

@article{Cunningham2019HALO7DIT,
  title={HALO7D I. The Line-of-sight Velocities of Distant Main-sequence Stars in the Milky Way Halo},
  author={Emily C. Cunningham and Alis J. Deason and Constance M. Rockosi and Puragra Guhathakurta and Zachary G. Jennings and Evan N. Kirby and Elisa Toloba and Guillermo Barro},
  journal={The Astrophysical Journal},
  year={2019}
}
The Halo Assembly in Lambda-CDM: Observations in 7 Dimensions (HALO7D) dataset consists of Keck II/DEIMOS spectroscopy and Hubble Space Telescope-measured proper motions of Milky Way halo main sequence turnoff stars in the CANDELS fields. In this paper, we present the spectroscopic component of this dataset, and discuss target selection, observing strategy, and survey properties. We present a new method of measuring line-of-sight (LOS) velocities by combining multiple spectroscopic observations… Expand
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References

SHOWING 1-10 OF 63 REFERENCES
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
The M31 Velocity Vector. I. Hubble Space Telescope Proper-motion Measurements
We present the first proper-motion (PM) measurements for the galaxy M31. We obtained new V-band imaging data with the Hubble Space Telescope ACS/WFC and the WFC3/UVIS instruments of three fields: aExpand
THE SHAPE AND PROFILE OF THE MILKY WAY HALO AS SEEN BY THE CANADA-FRANCE-HAWAII TELESCOPE LEGACY SURVEY
We use Canada-France-Hawaii Telescope Legacy Survey data for 170 deg2, recalibrated and transformed to the Sloan Digital Sky Survey ugri photometric system, to study the distribution of near-turnoffExpand
The age of the Milky Way inner halo
TLDR
Observations of newly formed white dwarf stars in the halo of the Milky Way are reported and a mathematical relation is developed that links this final stellar mass to the mass of their immediate progenitors, and therefore to the age of the parent population. Expand
Isotropic at the Break? 3D Kinematics of Milky Way Halo Stars in the Foreground of M31
We present the line-of-sight (LOS) velocities for 13 distant main sequence Milky Way halo stars with published proper motions. The proper motions were measured using long baseline (5-7 years)Expand
The Milky Way stellar halo out to 40 kpc: squashed, broken but smooth
We introduce a new maximum-likelihood method to model the density profile of blue horizontal branch and blue straggler stars and apply it to the Sloan Digital Sky Survey Data Release 8 photometricExpand
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
The Milky Way’s Circular Velocity Curve to 60 kpc and an Estimate of the Dark Matter Halo Mass from the Kinematics of ~2400 SDSS Blue Horizontal-Branch Stars
We derive new constraints on the mass of the Milky Way's dark matter halo, based on 2401 rigorously selected blue horizontal-branch halo stars from SDSS DR6. This sample enables construction of theExpand
Co-formation of the disc and the stellar halo
Using a large sample of Main Sequence stars with 7-D measurements supplied by Gaia and SDSS, we study the kinematic properties of the local (within ∼10 kpc from the Sun) stellar halo. WeExpand
A synthetic view on structure and evolution of the Milky Way
Since the Hipparcos mission and recent large scale surveys in the optical and the near-infrared, new constraints have been obtained on the structure and evolution history of the Milky Way. TheExpand
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