Discovery of a nearby 1700 km/s star ejected from the Milky Way by Sgr A*

  title={Discovery of a nearby 1700 km/s star ejected from the Milky Way by Sgr A*},
  author={Sergey E. Koposov and D. Boubert and T. Li and D. Erkal and G. Costa and D. Zucker and A. Ji and K. Kuehn and G. Lewis and D. Mackey and J. Simpson and N. Shipp and Z. Wan and V. Belokurov and J. Bland-hawthorn and S. Martell and T. Nordlander and A. Pace and G. D. Silva and M. Wang},
  journal={Monthly Notices of the Royal Astronomical Society},
  • Sergey E. Koposov, D. Boubert, +17 authors M. Wang
  • Published 2019
  • Physics
  • Monthly Notices of the Royal Astronomical Society
  • We present the serendipitous discovery of the fastest main-sequence hyper-velocity star (HVS) by the Southern Stellar Stream Spectroscopic Survey (S5). The star S5-HVS1 is a ∼2.35 M⊙ A-type star located at a distance of ∼9 kpc from the Sun and has a heliocentric radial velocity of 1017 ± 2.7 kms−1 without any signature of velocity variability. The current 3D velocity of the star in the Galactic frame is 1755 ± 50 kms−1⁠. When integrated backwards in time, the orbit of the star points… CONTINUE READING
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