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Astrophysical Black Holes: A Rapidly Moving Field

23–26 Jun 2023
University of Hong Kong, Centennial Campus, CPD 3.04
Asia/Hong_Kong timezone

Session

Simulations of accretion and outflow near black holes

24 Jun 2023, 09:30
University of Hong Kong, Centennial Campus, CPD 3.04

University of Hong Kong, Centennial Campus, CPD 3.04

Central Podium Levels – Three, Run Run Shaw Tower, Centennial Campus, The University of Hong Kong, The University of Hong Kong, Pokfulam, Hong Kong

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  1. 34. Radiation MHD simulations of super-/near-Eddington accretion flows and outflows
    Prof. Ken Ohsuga
    24/06/2023, 09:30
    Talk

    By performing the radiation-MHD simulations, we reveal the global inflow and outflow structures around black holes. The optically and geometrically thick disks supported by the radiation pressure form, and the powerful outflows are driven by the radiation force for electron scattering in the super-Eddington phase. A part of the outflows fragments into numerous gas clouds, and the outflow...

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  2. 16. Numerical study of AGN feedback at galactic scale
    Prof. Feng Yuan
    24/06/2023, 10:05
    Talk

    I will review wind launched from black holes, including their theoretical and observational evidences, main properties, driving mechanism, and its comparison with jet. While the talk will mainly focus on wind from a hot accretion flow, the cases of wind production from a standard thin disk and a super-Eddington accretion flow and the roles of wind played in AGN feedback will also be breifly introduced.

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  3. 27. Relativistic Jet Simulations and Modeling on Horizon Scale
    Prof. Yosuke Mizuno (Tsung-Dao Lee Institute, Shanghai Jiao Tong University)
    24/06/2023, 11:10
    Talk

    Relativistic jets are launched in the vicinity of the central black holes and emit powerful radiation across the electromagnetic spectrum. According to our current understanding, relativistic jets are launched by directly tapping the rotational energy of spinning black holes via the so-called Blandford-Znajek process. In addition to the spin of the black hole, numerical simulations showed the...

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  4. 28. Simulating Bondi-Like Accretion Flow Around Black Holes
    Mr Tom Kwan (The University of Hong Kong)
    24/06/2023, 11:28
    Talk

    While black hole accretion flow simulations usually start from gas disks with relatively large angular momenta, many important black hole astrophysical systems are believed to be fed by gas with low angular momenta, such as tidal disruption events, long gamma-ray bursts and wind-fed high mass X-ray binaries. We carry out 3D general relativistic magnetohydrodynamic (GRMHD) simulations of...

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  5. 67. Can two-temperature treatments in GRMHD simulations reduce the predicted variability compared to historical observations of Sgr A*?
    Mr Leon S. Salas
    24/06/2023, 11:46
    Talk

    Recent direct imaging by the Event Horizon Telescope Collaboration (EHTC) has confirmed the existence of an event horizon in Sagittarius A (Sgr A), the supermassive black hole at the center of the Milky Way. To model and interpret these data, the EHTC compares them to a library of fiducial models based general relativistic magnetohydrodynamic (GRMHD) simulations. One significant source of...

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  6. 26. Evolution of wandering intermediate-mass black holes in high-z galaxies with 3D radiation hydrodynamics simulations
    Ms Erika Ogata (University of Tsukuba)
    24/06/2023, 12:04
    Talk

    We have, for the first time, successfully performed three-dimensional radiative hydrodynamics simulations of the gas accretion onto intermediate-mass (IMBHs) black holes wandering in the high-z galaxies. Here the sublimation of the dust grain caused by the radiation from the accretion disks around IMBHs is taken into consideration. We found that the accretion rate and acceleration are $\sim...

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