Predicted Space Motions for Hypervelocity and Runaway Stars: Proper Motions and Radial Velocities for the GAIA Era

Abstract

We predict the distinctive three dimensional space motions of hypervelocity stars (HVSs) and runaway stars moving in a realistic Galactic potential. For nearby stars with distances less than 10~kpc, unbound stars are rare; proper motions alone rarely isolate bound HVSs and runaways from indigenous halo stars. At large distances of 20-100 kpc, unbound HVSs are much more common than runaways; radial velocities easily distinguish both from indigenous halo stars. Comparisons of the predictions with existing observations are encouraging. Although the models fail to match observations of solar-type HVS candidates from SEGUE, they agree well with data for B-type HVS and runaways from other surveys. Complete samples of g <= 20 stars with GAIA should provide clear tests of formation models for HVSs and runaways and will enable accurate probes of the shape of the Galactic potential.

ApJ, accepted, 42 pages of text, 3 tables, and 29 figures; revised version adds comparisons between models and observations of halo stars

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Cited by in corpus (32)

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• Joint constraints on the Galactic dark matter halo and Galactic Centre from hypervelocity stars
• Core-Collapse Supernovae in Binaries as the Origin of Galactic Hyper-Runaway Stars
• Gaia EDR3 in 6D: Searching for unbound stars in the Galaxy
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• Constraints on the Galactic Centre environment from Gaia hypervelocity stars
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• Constraints on the Galactic Centre environment from Gaia hypervelocity stars II: The evolved population
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• The luminosity function of quasars by the Principle of Maximum Entropy
• Intermediate-Mass Black Holes in binary-rich star clusters
• Transits Probabilities Around Hypervelocity and Runaway Stars
• Hypervelocity star candidates from Gaia DR2 and DR3 proper motions and parallaxes
• Red Runaways II: Low mass Hills stars in SDSS Stripe 82
• Candidate Hypervelocity Red Clump Stars in the Galactic Bulge Found Using the VVV and Gaia Surveys
• Probing the shape of the Milky Way dark matter halo with hypervelocity stars: a new method
• Basis function expansions for galactic dynamics: Spherical versus cylindrical coordinates
• Is there substructure around M87?
• Probing modified Newtonian dynamics with hypervelocity stars
• Searching for clues of past binary supermassive black hole mergers in nuclear star clusters
• Rotational modulation and single g-mode pulsation in the B9pSi star HD174356?
• A Candidate High-Velocity Exoplanet System in the Galactic Bulge
• Three New Late-type Hypervelocity Star Candidates from Gaia DR2 with Refined Selection Criteria
• Galactic Orbital Effects on Pulsar Timing
• Anisotropy of Halo Main Sequence Turnoff Stars Measured with New MMT Radial Velocities and Gaia Proper Motions