Predicting the hypervelocity star population in Gaia

@article{Marchetti2018PredictingTH,
  title={Predicting the hypervelocity star population in Gaia},
  author={Tommaso Marchetti and Omar Contigiani and Elena Maria Rossi and Joshua G. Albert and A. G. A. Brown and Alberto Sesana},
  journal={Monthly Notices of the Royal Astronomical Society},
  year={2018},
  volume={476},
  pages={4697-4712}
}
Hypervelocity stars (HVSs) are amongst the fastest objects in our Milky Way. These stars are predicted to come from the Galactic center (GC) and travel along unbound orbits across the Galaxy. In the coming years, the ESA satellite Gaia will provide the most complete and accurate catalogue of the Milky Way, with full astrometric parameters for more than $1$ billion stars. In this paper, we present the expected sample size and properties (mass, magnitude, spatial, velocity distributions) of HVSs… Expand
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References

SHOWING 1-10 OF 90 REFERENCES
AN ALTERNATIVE ORIGIN FOR HYPERVELOCITY STARS
Halo stars with unusually high radial velocity (hypervelocity stars, or HVS) are thought to be stars unbound to the Milky Way that originate from the gravitational interaction of stellar systems withExpand
Candidate hypervelocity stars of spectral type G and K revisited
Hypervelocity stars (HVS) move so fast that they are unbound to the Galaxy. When they were first discovered in 2005, dynamical ejection from the supermassive black hole (SMBH) in the Galactic CentreExpand
Hypervelocity stars and the environment of Sgr A
Hypervelocity stars (HVSs) are a natural consequence of the presence of a massive nuclear black hole (Sgr A � ) in the Galactic Center. Here we use the Brown et al. sample of unbound and bound HVSsExpand
THE VELOCITY DISTRIBUTION OF HYPERVELOCITY STARS
We consider the process of stellar binaries tidally disrupted by a supermassive black hole (BH). For highly eccentric orbits, as one star is ejected from the three-body system, the companion remainsExpand
Discovery of an Unbound Hypervelocity Star in the Milky Way Halo
We have discovered a star, SDSS J090745.0+024507, leaving the Galaxy with a heliocentric radial velocity of 853 ± 12 km s-1, the largest velocity ever observed in the Milky Way halo. The star isExpand
Hypervelocity Star Candidates in the SEGUE G and K Dwarf Sample
We present 20 candidate hypervelocity stars from the Sloan Extension for Galactic Understanding and Exploration (SEGUE) G and K dwarf samples. Previous searches for hypervelocity stars have onlyExpand
Binary companions of nearby supernova remnants found with Gaia
We search for runaway former companions of the progenitors of nearby Galactic core-collapse supernova remnants (SNRs) in the Tycho-Gaia astrometric solution (TGAS). We look for candidates for aExpand
MMT HYPERVELOCITY STAR SURVEY. III. THE COMPLETE SURVEY
We describe our completed spectroscopic survey for unbound hypervelocity stars (HVSs) ejected from the Milky Way. Three new discoveries bring the total number of unbound late B-type stars to 21. WeExpand
Constraining the Milky Way mass with hypervelocity stars
Abstract Although a variety of techniques have been employed for determining the Milky Way dark matter halo mass distribution, the range of allowed masses spans both light and heavy values. KnowingExpand
Probing the shape of the Galactic halo with hypervelocity stars
Precise proper-motion measurements (σμ ~ 10 μas yr-1) of the recently discovered hypervelocity star (HVS) SDSS J090745.0+024507 would yield significant constraints on the axis ratios and orientationExpand
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