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CANCELLED Due to Travel Issues from East Coast Blizzard! ASTRONOMY COLLOQUIUM: Global Radiation MHD Simulations of Black Hole Accretion Disks

Thursday, January 28, 2016
12:00 AM
411 West Hall

Please note that this talk is also part of the MICDE seminar series (http://micde.umich.edu/seminar-series/).

New results from a study of the magnetohydrodynamics of luminous accretion flows around black holes will be presented.  In this regime, radiation pressure dominates the flow.  Thus the calculations require numerical methods based on a formal solution of the time-dependent radiation transfer equation; we describe new algorithms we have developed that eliminate the need for approximate closures. We find that turbulent transport of radiation energy can be a significant contribution to the cooling rate in the disk, and this changes the global properties of the flow compared to standard thin-disk models.  We describe new work to extend our calculations to full general relativity, in order to follow the dynamics in the innermost regions of the disk.