Chinese Scientists Find Evidence for Intermediate-Mass Black Hole in Galactic Center

An international research team, led by Dr. Zheng Xiaochen from the Beijing Planetarium, has found the strongest dynamical evidence yet for an intermediate-mass black hole potentially lurking at the center of the Milky Way. The findings, published in The Astrophysical Journal, utilize large-scale numerical simulations to construct a unified dynamical model.

The study focused on three groups of young stars orbiting the supermassive black hole Sagittarius A* (Sgr A*). These stars, surprisingly uniform in age (6 to 15 million years old), exhibit vastly different orbital characteristics that could not be explained by traditional stellar dynamics alone. The most prominent groups include the S-star cluster very close to Sgr A*, a disk of stars closer to the center, and stars with highly inclined orbits further out.

The researchers propose a new explanation: these stars may share a common origin from a single gaseous disk. Their current orbital configurations are attributed to the gravitational influence of a hidden intermediate-mass black hole, estimated to be around 10,000 times the mass of the Sun. This object is a candidate for the so-called 'missing link' in black hole evolution between stellar-mass and supermassive black holes.

Using sophisticated simulations, the team demonstrated that the observed distribution of stellar orbits could only be reproduced if such an intermediate-mass gravitational source were present. The study further suggests that the IRS 13 star cluster near the galactic center is a potential candidate for this gravitational influence, though its exact nature is still debated. This research provides testable predictions, with future observations from instruments like China's Space Station Telescope expected to provide further verification.