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The Current Status of Hypervelocity Stars

The Current Status of Hypervelocity Stars. Galactic Center Workshop Shanghai 2009 Oct 21 Warren R. Brown Smithsonian – CfA Collaborators: Margaret Geller, Scott Kenyon. The First Hypervelocity Star. +850 km/s (!!). Links to the Black Hole Ejection Mechanism Observed Properties.

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The Current Status of Hypervelocity Stars

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  1. The Current Status ofHypervelocity Stars Galactic Center Workshop Shanghai 2009 Oct 21 Warren R. Brown Smithsonian – CfA Collaborators: Margaret Geller, Scott Kenyon

  2. The First Hypervelocity Star +850 km/s (!!)

  3. Links to the Black HoleEjection MechanismObserved Properties • Velocity distribution • Spatial distribution • Temporal distribution • Stellar Rotation distribution Single MBH + binary star (Hills 1988) Binary MBH + single star (Yu & Tremaine 2003) Stellar BH + MBH + star (O’Leary & Loeb 2008) (Sesana et al 2007) (Levin 2006) Hansen (2007) Lockmann & Baumgardt (2008) Lopez-Morales & Bonanos (2008)

  4. Latest Results HVSs Brown et al (2009a)

  5. Links to Dark Matter Brown et al. (2009b)

  6. HVS = Galactic Center origin • There are unbound stars in halo. • MBH in the GC. • Stars orbit the MBH. • HVSs are B stars. • GC full of B stars. • Travel times < lifetimes. • Nobs = Npredicted. Heber et al (2008) but . . .

  7. Runaway B Stars Runaways HVSs • Binary disruption: • Supernova • Dynamical Bromley, Kenyon, Brown & Geller (2009)

  8. Runaway vs. HVS Bromley, Kenyon, Brown & Geller (2009) Brown et al. (2009b)

  9. Conclusions 1. = 2. NY Times

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