You are all invited to participate in the BiCoQ seminar “Pre-Direct Collapse Simulations of the Massive Black Hole Seed Formation

Speaker: Professor Kentaro Nagamine (Osaka University)

Abstract: Recent JWST observations are discovering many massive black holes in the early universe, and the direct collapse scenario for massive black hole seed formation is becoming more attractive and realistic.  However, physical feasibility of such a process has not been fully established, and more detailed / realistic numerical simulations are necessary to fully understand the complex nature of collapsing clouds in the early universe.  In this talk, I will describe our work on this scenario using the Enzo AMR cosmological hydrodynamic code with radiative feedback in a cosmological environment (cf. Ardaneh et al. 2018;  Luo, et al., 2016, 2018, 2020, 2023).   Radiative transfer has been treated on the fly either by the flux-limited diffusion (FLD) approximation or the ray-tracing methods.   In both cases, we find a buildup of outflows from the central object due to radiation pressure, prohibiting spherical accretion onto the central region.  The inclusion of radiative transfer reveals complex early stages of formation with anisotropic accretion flow and growth of the central structure in the direct collapse scenario. In the most recent run with the maximal resolution of 1.3e-5 pc, we analyze the detailed structure of hot cavities and expanding dense shells.  

Date/Time: Wednesday, 27th September 2023, 11:30

Location: U1, Aula Marchetti

BiCoQ Seminar (27/9/2023, 11:30) – Prof. Kentaro Nagamine