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Special ACKS Seminar: Dragan Huterer
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ACKS Seminar: Prateek Sharma (UC-Berkeley)
| What | ACKS |
|---|---|
| When |
24 April 08 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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Energy and Angular Momentum Transport in Hot Accretion Flows
I will discuss transport processes in hot, collisionless accretion flows. An accretion flow becomes hot and puffed up when the local cooling time becomes longer than the infall (viscous) time. Such dilute, hot plasmas are expected to be collisionless, with mean free path larger than the disk height scale. A magnetized collisionless plasma is anisotropic with respect to the magnetic field: momentum and heat is transported primarily along the field lines. Pressure anisotropy with respect to local field lines is generated naturally in collisionless accretion flows. This pressure anisotropy enhances angular momentum transport and can cause 'viscous' heating of electrons and ions at large scales. This 'viscous' contribution to electron heating can result in hot thermal electrons, consistent with observations of Sgr A*, supermassive black hole in the Galactic center. I will also breifly discuss global transport properties (e.g., thermal conduction) in hot accretion flows.
Special ACKS Seminar: Dragan Huterer