ArticleNational science review2025
A high-velocity star recently ejected by an intermediate-mass black hole in M15.
Article in National science review, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
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 intersected that of globular cluster M15 within the cluster tidal radius. Both its metallicity [Fe/H] and alpha-to-iron abundance ratio [[Formula: see text]/Fe] are consistent with those of M15. Furthermore, its location falls right on the fiducial sequence of cluster M15 on the color-absolute magnitude diagram, suggesting similar ages. These findings support the notion that J0731+3717 was originally associated with M15 at a confidence level of 'seven nines'. We find that such a high-velocity star ([Formula: see text] km s[Formula: see text]) was most likely tidally ejected from as close as one astronomical unit to the center of M15, confirming an IMBH ([Formula: see text] with a credibility of 98%) as the exclusive nature of the central unseen mass proposed previously.
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