The Current Status of Hypervelocity Stars Galactic Center Workshop Shanghai 2009 Oct 21 Warren R....
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The Current Status of Hypervelocity Stars Galactic Center Workshop Shanghai 2009 Oct 21 Warren R. Brown Smithsonian – CfA Collaborators: Margaret Geller, Scott Kenyon
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Transcript of The Current Status of Hypervelocity Stars Galactic Center Workshop Shanghai 2009 Oct 21 Warren R....
The Current Status of
Hypervelocity Stars
Galactic Center Workshop
Shanghai2009 Oct 21
Warren R. BrownSmithsonian – CfA
Collaborators:
Margaret Geller, Scott Kenyon
+850 km/s (!!)
The First Hypervelocity Star
Links to the Black Hole
Ejection Mechanism Observed 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)
Latest Results
Brown et al (2009a)
Links to Dark Matter
Brown et al. (2009b)
HVS = Galactic Center origin1. There are unbound stars in halo.
2. MBH in the GC.
3. Stars orbit the MBH.
4. HVSs are B stars.
5. GC full of B stars.
6. Travel times < lifetimes.
7. Nobs = Npredicted.
Heber et al (2008)
but . . .
Runaway B Stars
HVSs
Binary disruption:1. Supernova2. Dynamical
Runaways
Bromley, Kenyon, Brown & Geller (2009)
Runaway vs. HVS
Bromley, Kenyon, Brown & Geller (2009)
Brown et al. (2009b)
Conclusions
1. =
2.
NY Times
