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Event Date:
2019-01-21T15:00:00
2019-01-21T16:00:00
Event Location:
Hennings 318
Speaker:
James Stone (Princeton)
Related Upcoming Events:
Intended Audience:
Undergraduate
Local Contact:

Douglas Scott

Event Information:

At high accretion rates, the outward force of radiation pressure?generated by energy released by infalling matter can exceed the?inward pull of gravity.? Such super-Eddington accretion flows occur?in many systems, such as the inner regions of quasars and luminous?AGN, ultra-luminous X-ray sources (ULXs), and tidal disruption?events.? Understanding such flows 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?galaxy formation.? New results from a study of the magnetohydrodynamics?of luminous accretion flows, in which radiation pressure dominates,?will be presented. Our results reveal new physical effects, such?as turbulent transport 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.

Add to Calendar 2019-01-21T15:00:00 2019-01-21T16:00:00 Radiation-Dominated Black Hole Accretion Flows Event Information: At high accretion rates, the outward force of radiation pressure?generated by energy released by infalling matter can exceed the?inward pull of gravity.? Such super-Eddington accretion flows occur?in many systems, such as the inner regions of quasars and luminous?AGN, ultra-luminous X-ray sources (ULXs), and tidal disruption?events.? Understanding such flows 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?galaxy formation.? New results from a study of the magnetohydrodynamics?of luminous accretion flows, in which radiation pressure dominates,?will be presented. Our results reveal new physical effects, such?as turbulent transport 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. Event Location: Hennings 318