Radiation-regulated accretion onto seed black holes

Discovery of billion solar mass quasars at high redshift poses a great challenge for modeling the initial seed black holes formationand their subsequent growth history. Thus, estimating growth rate of seed black holes in the range 10^2-10^5 solar mass is criticalto test suggested scenarios. In this talk, I will discuss how gas accretion onto intermediate-mass black holes is regulated by radiativefeedback emphasizing the role of thermal and radiation pressure in limiting gas supply from large scale to the black holes. Given thedifficulty of seed black hole growth due to radiative feedback, I will discuss how stellar bulge component assembly can enhance thegas accretion onto heavy seed black holes and leads the system to hyper-accretion regime. I will also present Bondi-Hoyle typesimulations with radiative feedback to show how dramatically radiative feedback changes the classical understanding of accretion onto blackholes in supersonic motion. Especially, our recent simulations suggest that dynamical friction of black holes in supersonic motionbecomes greatly reduced by radiative feedback.

Speaker: 
KwangHo Park (Georgia Tech)
Location: 
KIAA, 1st meeting room
Time: 
Thu, 2018-11-01 12:00 to 13:00