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SUMMARY:Physics Colloquium: Warren R. Brown
DESCRIPTION:Hypervelocity Stars\nDr. Warren R. Brown\, Smithsonian Astrophysical Observatory \nHypervelocity stars are ejected by the Galaxy’s central massive black hole at speeds that exceed Galactic escape velocity.  We discovered the first hypervelocity star in 2005\, and have since found many more unbound stars in a targeted survey.  The stars are interesting because their distributions in space and velocity are linked to the black hole ejection mechanism.  The 3D trajectories of the stars — which travel from the very center to the outer halo — are potentially unique probes of the Galaxy’s dark matter distribution.
URL:https://uwm.edu/physics/event/physics-colloquium-warren-r-brown/
LOCATION:Lapham 160\, 3209 N. Maryland Ave.\, Milwaukee\, WI\, 53211\, United States
CATEGORIES:Physics Colloquia
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SUMMARY:Physics Colloquium: Shane Davis
DESCRIPTION:How Black Holes Dine Above the Eddington “Limit” Without Overheating or Excessive Belching\nDr. Shane Davis\, Dept. of Astronomy\, University of Virginia \nThe study of super-Eddington accretion is essential to our understanding of the growth of super-massive black holes in the early universe\, the accretion of tidally disrupted stars\, and the nature of ultraluminous X-ray sources.  Unfortunately\, this mode of accretion is particularly difficult to model because of the multidimensionality of the flow\, the importance magnetohydrodynamic turbulence\, and the dominant dynamical role played by radiation forces.  However\, recent increases in computing power and advances in algorithms are facilitating major improvements in our ability to model radiation in numerical simulations of astrophysical plasmas.  \nI will briefly describe our new radiation transfer modules and discuss our efforts to model super-Eddington accretion flows.  I will focus on applications to ultraluminous X-ray sources\, which must be radiating well above their Eddington luminosity unless they harbour intermediate mass black holes. I will argue that most of these sources can be (and likely are) “normal” ~10 solar mass black holes accreting and radiating with luminosities well above their Eddington “limit”.
URL:https://uwm.edu/physics/event/physics-colloquium-shane-davis/
LOCATION:Lapham 160\, 3209 N. Maryland Ave.\, Milwaukee\, WI\, 53211\, United States
CATEGORIES:Physics Colloquia
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