A high-velocity star recently ejected by an intermediate-mass black hole in M15
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866913501132357632 |
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| author | Huang, Yang Li, Qingzheng Liu, Jifeng Dong, Xiaobo Zhang, Huawei Lu, Youjun Du, Cuihua |
| author_facet | Huang, Yang Li, Qingzheng Liu, Jifeng Dong, Xiaobo Zhang, Huawei Lu, Youjun Du, Cuihua |
| contents | 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 cluster tidal radius. Both its metallicity [Fe/H] and its alpha-to-iron abundance ratio [$α$/Fe] are consistent with those of M15. Furthermore, its location falls right on the fiducial sequence of the cluster M15 on the color-absolute magnitude diagram, suggesting similar ages. These support that J0731+3717 is originally associated with M15 at a confidence level of "seven nines". We find that such a high-velocity star ($V_{\rm ej} = 548^{+6}_{-5}$ km s$^{-1}$) was most likely tidally ejected from as close as one astronomical unit to the center of M15, confirming an IMBH ($\ge 100 M_{\odot}$ with a credibility of 98%) as the exclusive nature of the central unseen mass proposed previously. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_00923 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | A high-velocity star recently ejected by an intermediate-mass black hole in M15 Huang, Yang Li, Qingzheng Liu, Jifeng Dong, Xiaobo Zhang, Huawei Lu, Youjun Du, Cuihua Astrophysics of Galaxies High Energy Astrophysical Phenomena Solar and Stellar Astrophysics 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 cluster tidal radius. Both its metallicity [Fe/H] and its alpha-to-iron abundance ratio [$α$/Fe] are consistent with those of M15. Furthermore, its location falls right on the fiducial sequence of the cluster M15 on the color-absolute magnitude diagram, suggesting similar ages. These support that J0731+3717 is originally associated with M15 at a confidence level of "seven nines". We find that such a high-velocity star ($V_{\rm ej} = 548^{+6}_{-5}$ km s$^{-1}$) was most likely tidally ejected from as close as one astronomical unit to the center of M15, confirming an IMBH ($\ge 100 M_{\odot}$ with a credibility of 98%) as the exclusive nature of the central unseen mass proposed previously. |
| title | A high-velocity star recently ejected by an intermediate-mass black hole in M15 |
| topic | Astrophysics of Galaxies High Energy Astrophysical Phenomena Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2406.00923 |