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Special ACKS Seminar: Dragan Huterer
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ACKS Seminar: Marla Geha (HIA/Victoria & Yale)
| What | ACKS |
|---|---|
| When |
25 October 07 from 04:00 pm to 05:00 pm |
| Where | SLAC, 3rd Floor KAVLI Conf Room |
| Contact Name | Lukasz Stawarz |
| Contact Email | stawarz@slac.stanford.edu |
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Meet the New Neighbors: Kinematics of the Ultra-Faint Milky Way Dwarf Galaxies
In the past two years the number of satellite galaxies around the Milky Way has doubled. These newly discovered objects have luminosities similar to the faintest globular clusters, but kinematics and metallicities which firmly suggest that they are dwarf galaxies. I present Keck/DEIMOS spectroscopy for eight of these ultra-faint satellites. All are highly dark matter-dominated with mass-to-light ratios approaching 1000. These ultra-faint dwarf galaxies substantially alleviate the discrepancy between the observed number of Milky Way satellites and that predicted by the standard Lambda Cold Dark Matter model. I will discuss both the astrophysical and cosmological implications of this new galaxy population.
Special ACKS Seminar: Dragan Huterer