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A Clash of Clusters Provides New Clue to Dark Matter
Special ACKS Seminar: Dragan Huterer
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ACKS Seminar: Glennys Farrar (NYU)
| What | seminar ACKS |
|---|---|
| When |
16 November 06 from 04:00 pm to 05:00 pm |
| Where | Campus: Varian 3rd Fl. Conf. Rm. |
| Contact Name | Roger Blandford |
| Contact Email | rdb3@stanford.edu |
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Evidence for a Long-Range, Non-Gravitational Force in the Dark Sector
Abstract
We study the kinematics of dark matter using the massive cluster of galaxies 1E0657-56. The velocity of the ``bullet" subcluster has been measured by X-ray emission from the shock front, and the masses and separation of the main and sub-clusters have been measured by gravitational lensing. The velocity with gravity alone is calculated in a variety of models of the initial conditions, mass distribution and accretion history; it is much higher than expected. Updating the Hayashi-White analysis, results in an estimate for the probability of so large a subcluster velocity in the Millenium Simulation < 10^-7. A long range force with strength `0.4 - 1 times that of gravity would provide the needed additional acceleration.
MASS: Lance Simms