SIMBAD references

2018ApJ...866...39B - Astrophys. J., 866, 39-39 (2018/October-2)

Gaia and the Galactic Center origin of hypervelocity stars.


Abstract (from CDS):

We use new Gaia measurements to explore the origin of the highest velocity stars in the hypervelocity star (HVS) survey. The measurements reveal a clear pattern in B-type stars. Halo stars dominate the sample at speeds of ≃100 km s–1 below Galactic escape velocity. Disk runaway stars have speeds up to ≃100 km s–1 above Galactic escape velocity, but most disk runaways are bound. Stars with speeds >=100 km s–1 above Galactic escape velocity originate from the Galactic center. Two bound stars may also originate from the Galactic center. Future Gaia measurements will enable a large, clean sample of Galactic center ejections for measuring the massive black hole ejection rate of HVSs, and for constraining the mass distribution of the Milky Way dark matter halo.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): Galaxy: halo - Galaxy: kinematics and dynamics - stars: early-type - stars: kinematics and dynamics

CDS comments: Stars B080 and B149 are not in SIMBAD.

Simbad objects: 44

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