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An Old, Low-mass, Metal-poor Hypervelocity Star Candidate Consistent with a Galactic Center Origin

  • Authors: Shunhong Deng, Yang Huang, Haozhu Fu, Yongkang Sun, Qikang Feng, Guoyang Chen, Huawei Zhang

Shunhong Deng et al 2026 The Astrophysical Journal Letters 1003 .

  • Provider: AAS Journals

Caption: Figure 3.

Galactocentric total velocity of DESI-HVS1 compared with escape velocity curves. The black dashed line shows the observed Galactic escape velocity curve from A. A. Williams et al. (2017). The green, red, and purple dashed lines correspond to predictions from the Galactic potential models (J. Bovy 2015, M. Cautun et al. 2020, and Y. Wu et al. 2025, respectively). The blue star shows the result obtained using the parallax-based distance (R = 7.65 ± 0.06 kpc, ﹩{V}_{{\rm{GSR}}}=53{0}_{-96}^{+100}\,{\rm{km}}\,{{\rm{s}}}^{-1}﹩), while the red star corresponds to the improved distance (R = 7.63 ± 0.03 kpc, ﹩{V}_{{\rm{GSR}}}=52{3}_{-47}^{+46}\,{\rm{km}}\,{{\rm{s}}}^{-1}﹩).

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