Spitzer, Gaia, and the Potential of the Milky Way

@article{PriceWhelan2013SpitzerGA,
  title={Spitzer, Gaia, and the Potential of the Milky Way},
  author={A. Price-Whelan and K. Johnston},
  journal={The Astrophysical Journal},
  year={2013},
  volume={778}
}
Near-future data from ESA's Gaia mission will provide precise, full phase-space information for hundreds of millions of stars out to heliocentric distances of ~10 kpc. This "horizon" for full phase-space measurements is imposed by the Gaia parallax errors degrading to worse than 10%, and could be significantly extended by an accurate distance indicator. Recent work has demonstrated how Spitzer observations of RR Lyrae stars can be used to make distance estimates accurate to 2%, effectively… Expand

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References

SHOWING 1-10 OF 39 REFERENCES
A Prescription for Building the Milky Way's Halo from Disrupted Satellites
We develop a semianalytic method for determining the phase-space population of tidal debris along the orbit of a disrupting satellite galaxy and illustrate its use with a number of applications. WeExpand
Tidal Streams as Probes of the Galactic Potential
We explore the use of tidal streams from Galactic satellites for recovering the potential of the Milky Way. Our study is motivated both by the discovery of the first lengthy stellar stream in theExpand
GAIA: Composition, formation and evolution of the Galaxy
The GAIA astrometric mission has recently been approved as one of thenext two ``cornerstones'' of ESA's science programme, with a launch datetarget of not later than mid-2012. GAIA will provideExpand
Constraining the Milky Way Potential with a Six-Dimensional Phase-Space Map of the GD-1 Stellar Stream
The narrow GD-1 stream of stars, spanning 60? on the sky at a distance of ~10?kpc from the Sun and ~15?kpc from the Galactic center, is presumed to be debris from a tidally disrupted star clusterExpand
Constraining the History of the Sagittarius Dwarf Galaxy Using Observations of Its Tidal Debris
We present a comparison of semianalytic models of the phase-space structure of tidal debris with measurements of average distances, velocities, and surface densities of stars associated with theExpand
The Ghost of Sagittarius and Lumps in the Halo of the Milky Way
We identify new structures in the halo of the Milky Way from positions, colors, and magnitudes of five million stars detected in the Sloan Digital Sky Survey. Most of these stars are within 126 ofExpand
The cold veil of the Milky Way stellar halo.
We build a sample of distant (D > 80 kpc) stellar halo stars with measured radial velocities. Faint (20 < g < 22) candidate blue horizontal branch (BHB) stars were selected using the deep, but wide,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 APM survey for cool carbon stars in the Galactic halo – I
A by-product of the APM high-redshift quasar survey was the discovery of several distant (20–100 kpc) N-type carbon stars at high galactic latitude. Following on from this, we have started aExpand
TRACING THE ORPHAN STREAM TO 55 kpc WITH RR LYRAE STARS
We report positions, velocities and metallicities of 50ab-type RR Lyrae (RRab) stars observed in the vicinity of the Orphan stellar stream. Using about 30 RRab stars classied as being likely membersExpand
...
1
2
3
4
...