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Discovery of a nearby 1700 kms 1 star ejected from the Milky Way by Sgr A

Koposov, Sergey; Boubert, Douglas; Li, Ting S; Da Costa, Gary; Erkal, Denis; Zucker, Daniel; Ji, Alexander P; Kuehn, Kyler; Mackey, Dougal; Lewis, Geraint Francis; Simpson, Jeffrey D; Shipp, N; Nordlander, Thomas


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...[Show more]

CollectionsANU Research Publications
Date published: 2020
Type: Journal article
Source: Monthly Notices of the Royal Astronomical Society
DOI: 10.1093/mnras/stz3081
Access Rights: Open Access


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