Kavli Affiliate: Lile Wang
| First 5 Authors: Muxin Liu, Lile Wang, Peng Peng, ,
| Summary:
Stars with outflows interacting with ambient gas experience accelerations
arising from the gravitational feedback induced by the interaction structure.
In this work, three-dimensional (3D) local shearing box simulations are
performed to investigate the dynamical evolution of a star with outflows
embedded in the outer regions of an active galactic nucleus (AGN) disk. Two
types of stellar wind are considered: isotropic winds and axisymmetric jets,
along with variations in the radial pressure gradient profile. The results show
that anti-friction enables AGN stars to acquire angular momentum from the
ambient gas, resulting in outward migration away from the disk center. The
formation and stability of the head-wind structure, which is crucial for
maintaining anti-friction, are sensitive to both the strength of the stellar
outflow and the radial pressure gradient of the disk gas. Once the head-wind
structure is disrupted, the anti-friction effect ceases to operate effectively.
A case study is also presented, focusing on a stellar-mass black hole (sBH) in
an AGN disk. It is shown that jet material launched along the z-axis is
confined to the trailing side of the object’s motion by high gas inflow
velocities, thereby activating anti-friction and inducing outward migration. If
such an sBH migrates inward initially, the interplay between inward and outward
migration may trap it at an equilibrium radius, potentially facilitating the
formation and merger of black hole binaries.
| Search Query: ArXiv Query: search_query=au:”Lile Wang”&id_list=&start=0&max_results=3