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SUMMARY:Radiation-Dominated Black Hole Accretion Flows - James Stone (Inst
 itute for Advanced Study\, Princeton)
DTSTART:20200130T160000Z
DTEND:20200130T170000Z
UID:TALK136609@talks.cam.ac.uk
CONTACT:Steven Brereton
DESCRIPTION:At high accretion rates\, the outward force of radiation press
 ure generated by energy released by infalling matter can exceed the inward
  pull of gravity. Such super-Eddington accretion flows occur in many syste
 ms\, such as the inner regions of quasars and luminous AGN\, ultra-luminou
 s X-ray sources (ULXs)\, and tidal disruption events. Understanding such f
 lows is important not only for interpreting the spectra and variability of
  these sources\, but also to predict the rate of growth of black holes in 
 the early universe\, and to quantify energy and momentum feedback into the
  medium surrounding the black hole\, a process likely to be important in g
 alaxy formation. New results from a study of the magnetohydrodynamics of l
 uminous accretion flows\, in which radiation pressure dominates\, will be 
 presented. Our results reveal new physical effects\, such as turbulent tra
 nsport of radiation energy\, that require extension of standard thin-disk 
 models. We discuss the implications of our results for the astrophysics of
  accreting black holes.
LOCATION:Sackler Lecture Theatre\, Institute of Astronomy\, Madingley Rise
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