Visit ASIAA Homepage Registration Deadline: November 1, 2018 (Taiwan Time)
East-Asia AGN Workshop 2019
January 21(Mon)-23(Wed), 2019
ASIAA Auditorium, 1st Floor AS/NTU Astronomy-Mathematics Building

Poster Presentation

Transition of BH feeding processes from radiatively inefficient accretion into cold-thin disk accretion

Author(s): Kohei Inayoshi

Presenter: Kohei Inayoshi (Kavli Institute for Astronomy and Astrophysics)

Radiatively inefficient accretion flows are quite interesting since many observed supermassive black holes (SMBHs) accrete at rates of only a small fraction of the Bondi accretion rate and their radiation luminosity is
as low as 10^{-2}-10^-9 L_Edd. We study axisymmetric accretion flows on to a SMBH from the circumnuclear region with two-dimensional hydrodynamical simulations, adopting the alpha-viscosity prescription.
When the gas angular momentum is low enough to form a rotationally supported disc/torus within the Bondi radius, we find a global steady accretion solution.
In addition, we find characteristics of the transition from hot modes to cold modes when the bondi accretion rate is increased. We also discuss the formation of a gravitationally unstable disk in the nuclear region, and suggest a possible explanation of the origin of massive stars in the galactic nuclei and the remnant of post-AGN activity.

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