SIMBAD references

2007ApJ...671.1708B - Astrophys. J., 671, 1708-1716 (2007/December-3)

Hypervelocity stars. III. The space density and ejection history of main-sequence stars from the Galactic Center.


Abstract (from CDS):

We report the discovery of three new unbound hypervelocity stars (HVSs), stars traveling with such extreme velocities that dynamical ejection from a massive black hole (MBH) is their only suggested origin. We also detect a population of possibly bound HVSs. The significant asymmetry we observe in the velocity distribution–we find 26 stars with vrf>275 km/s and one star with vrf←275 km/s–shows that HVSs must be short-lived, probably 3-4 Mmain-sequence stars. Any population of hypervelocity post-main-sequence stars should contain stars falling back onto the Galaxy, contrary to the observations. The spatial distribution of HVSs also supports the main-sequence interpretation: longer lived 3 M HVSs fill our survey volume; shorter lived 4 M HVSs are missing at faint magnitudes. We infer that there are 96±10 HVSs of mass 3-4 M within R<100 kpc, possibly enough HVSs to constrain ejection mechanisms and potential models. Depending on the mass function of HVSs, we predict that SEGUE may find up to 5-15 new HVSs. The travel times of our HVSs favor a continuous ejection process, although a ∼120 Myr old burst of HVSs is also allowed.

Abstract Copyright:

Journal keyword(s): Galaxy: Center - Galaxy: Halo - Galaxy: Kinematics and Dynamics - Galaxy: Stellar Content - Stars: Early-Type

VizieR on-line data: <Available at CDS (J/ApJ/671/1708): table2.dat>

Nomenclature: Table 1: [BGK2006] HV NN (Nos 8-10) added. Table 2: [BGK2006] N=381.

Simbad objects: 396

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