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A high-velocity star recently ejected by an intermediate-mass black hole in M15

Huang, Yang; Liu, Jifeng; Lu, Youjun +4 more

The existence of intermediate-mass black holes (IMBHs) is crucial for understanding various astrophysical phenomena, yet their existence remains elusive, except for the LIGO-Virgo detection. We report the discovery of a high-velocity star J0731+3717, whose backward trajectory about 21 Myr ago intersects that of globular cluster M15 within the clus…