【8.11; Seminar】2025年粒子天体物理全国重点实验室系列学术报告 #21：Moving-mesh Hydro-dynamic Simulation of Wind/Jet Driven ULX Bubbles

时间/Time: 8月11日周一上午10:00/Monday, August 11, 10:00 a.m.

地点/Location: 多学科楼312会议室/Meeting Room 312, Multidisciplinary building

报告人/Speaker: Dr. Jiahui Huang (Center for Computational Sciences, University of Tsukuba) 

题目/Title: Moving-mesh Hydro-dynamic Simulation of Wind/Jet Driven ULX Bubbles

主持人/Host:陶炼/ Dr. TAO Lian

摘要/Abstract:

The outflows from super-Eddington accretion systems may interact with interstellar medium (ISM) and produce bubble-like structures, e.g. optical bubble nebulae around Ultraluminous X-ray sources (ULX bubbles). Systematic study of such bubble systems can reveal the embedded outflow structures (e.g. wide-angle or narrow) of the central accretion systems. We use moving-mesh hydrodynamical simulations to simulate the production and propagation of such bubble structures driven by wide-angle outflows and narrow-angle jets, to about ~100 pc. Simulation results show that the outflow velocity and the opening angle will decide the morphology of the bubble, while the total input energy and the background ISM density will influence the bubble size without changing its shape. The outflows with lower mechanical power reduce the cooling timescale of the bubble, which leads to an early collapse of the bubble shell. We find that by combining the surface luminosity and the line-of- sight velocity distribution of the simulated bubbles, we can constrain the inclination angle of the accretion system, which is an important supplement to the spectral fitting of the ULXs in the observations. 

个人简介/Biography:

Jiahui Huang, PostDoc Researcher in Center for Computational Sciences, University of Tsukuba.

Dr. Jiahui Huang is now working as a PostDoc researcher in Center for Computational Sciences, University of Tsukuba since August, 2024. He entered Department of Engineering Physics, Tsinghua University in 2015 and got his PhD degree in Nuclear Science and Technology in 2024. His research interest is the magneto-hydrodynamic simulations of high energy astrophysical phenomena, especially accretion physics, using MHD code such as Athena++ and AREPO. He also did some work in the analytical modelling of magnetic accretion flows.