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Add to Calendar 11/28/2018 12:00 pm 11/28/2018 America/Chicago Astrophysics, Gravitation and Cosmology Seminar - "Magnetically Arrested Disks in Black Hole Accretion Flows" DESCRIPTION:

Some of the most energetic phenomena in the universe, such as AGN and especially relativistic jets, are believed to be powered by mass accretion flows around supermassive black holes (SMBH) at the centers of galaxies. Upcoming measurements of two nearby SMBHs from both the GRAVITY and Event Horizon Telescope collaborations are expected to provide an abundance of high resolution observations which can be compared to accretion disk simulations in hopes of identifying and testing the underlying physics associated with the flows. In this talk, I will provide a brief review of the theory of accretion disks and some of the computational tools used to study accretion flows. I will overview different categorizations of flows and discuss details of the so-called "magnetically arrested disk" (MAD) state which develops when enough magnetic pressure has accumulated to balance inward gravitational forces. I will then briefly discuss how fluid simulation data can be used to synthesize the radiative observables produced by measurement and present some recent simulation results for provisional comparison to previous and upcoming observations.

\n\nSPEAKER: George Wong, University of Illinois at Urbana-Champaign
464 Loomis Lab false

Astrophysics, Gravitation and Cosmology Seminar - "Magnetically Arrested Disks in Black Hole Accretion Flows"

Speaker George Wong, University of Illinois at Urbana-Champaign
Date: 11/28/2018
Time: 12 p.m.
Location: 464 Loomis Lab
Event Contact: Betsy Greifenkamp
greifenk@illinois.edu
Sponsor: Department of Physics
Event Type: Seminar/Symposium
 

Some of the most energetic phenomena in the universe, such as AGN and especially relativistic jets, are believed to be powered by mass accretion flows around supermassive black holes (SMBH) at the centers of galaxies. Upcoming measurements of two nearby SMBHs from both the GRAVITY and Event Horizon Telescope collaborations are expected to provide an abundance of high resolution observations which can be compared to accretion disk simulations in hopes of identifying and testing the underlying physics associated with the flows. In this talk, I will provide a brief review of the theory of accretion disks and some of the computational tools used to study accretion flows. I will overview different categorizations of flows and discuss details of the so-called "magnetically arrested disk" (MAD) state which develops when enough magnetic pressure has accumulated to balance inward gravitational forces. I will then briefly discuss how fluid simulation data can be used to synthesize the radiative observables produced by measurement and present some recent simulation results for provisional comparison to previous and upcoming observations.

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