Chủ đề: Feedback-driven Multiphase Accretion in M87: Insights from Meso-scale Simulations

Thời gian, địa điểm: 9:00 thứ Thứ 5 ngày 12/6/2025, Phòng 903 nhà A6, Trung tâm Vũ trụ Việt Nam, 18 Hoàng Quốc Việt, Hà Nội.

Diễn giả: Hà Vĩnh Trung (Nghiên cứu sinh Tiến sĩ, Department of Astronomy, University of Massachusetts Amherst, USA)

Nội dung: The feeding and feedback cycles of supermassive black holes play a vital role in galaxy formation and evolution. While state-of-the-art numerical simulations effectively reproduce multiphase gas at the galaxy scale, understanding its connection to the gas at the accretion-disk scale remains challenging. Such a connection is crucial for setting up realistic general-relativistic magneto-hydrodynamical (GRMHD) simulations of the multiphase accretion flow in the inner 100 Schwarzschild radii. Our study bridges this gap by exploring meso-scale accretion flows and their implications for galaxy evolution. We employ (M)HD simulations with Athena++ to study the elliptical galaxy M87. Our galaxy-scale simulations incorporate an AGN jet feedback prescription that balances cooling on large scales. Utilizing a nested zoom-in technique, we construct mesoscale simulations to model the dynamical evolution of multiphase accretion flow within the central parsecs. Our study confirms the well-known correlation M˙∝r^(1/2) across seven orders of magnitude in scale. This suggests that the total accretion rate is set by galaxy-scale gas kinematics, even though the meso-scale morphology can vary significantly over time. At the highest resolution, our simulation can effectively model black hole variability over a one-year timescale, allowing for direct comparison with current and future observations made by the Event Horizon Telescope. These simulations will ultimately provide more realistic boundary and initial conditions for accretion disk simulations, as well as improved subgrid models for cosmological simulations.

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Hình trên: Ảnh chụp về phía hố đen siêu siêu nặng M87 sử dụng ánh sáng phân cực | ESO