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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: Christoph Pfrommer (CITA, Toronto)
| What | ACKS |
|---|---|
| When |
01 November 07 from 04:00 pm to 05:00 pm |
| Where | CAMPUS: Phys & Astrophys Bldg., 1st fl., conf rm (102/103) |
| Contact Name | Lukasz Stawarz |
| Contact Email | stawarz@slac.stanford.edu |
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Cosmic Rays in Clusters of Galaxies - Tuning in to the Non-Thermal Universe
Understanding the non-thermal physics connected to structure formation will be an important frontier for cosmology in the upcoming decade, while entering a new era of multi-frequency experiments that soon will go on-line. In this talk, I present theoretical work that complements this observational effort and describe high-resolution simulations of galaxy clusters that self-consistently follow dissipative gas and cosmic ray physics. A substantial pressure contribution from relativistic protons can have a major impact on the properties of the intra-cluster medium and modifies thermal cluster observables such as the X-ray emission and the Sunyaev-Zel'dovich effect. I will review different particle acceleration processes in clusters and put forward a unified model for the generation of cluster radio relics and giant radio halos. The resulting model signatures of the expected radio synchrotron, hard X-ray, and gamma-ray emission can then be tested with the upcoming new generation of low-frequency radio telescopes and gamma-ray instruments such as GLAST.
KIPAC tea talk, Speaker: Lukasz Stawarz