Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2010-07-20
Brown et al 2010, ApJ, 719, L23
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
5 pages, accepted in ApJ Letters
Scientific paper
10.1088/2041-8205/719/1/L23
We use Hubble Space Telescope imaging to measure the absolute proper motion of the hypervelocity star (HVS) HE 0437-5439, a short-lived B star located in the direction of the Large Magellanic Cloud (LMC). We observe (\mu_\alpha, \mu_\delta)=(+0.53+-0.25(stat)+-0.33(sys), +0.09+-0.21(stat)+-0.48(sys)) mas/yr. The velocity vector points directly away from the center of the Milky Way; an origin from the center of the LMC is ruled out at the 3-sigma level. The flight time of the HVS from the Milky Way exceeds its main-sequence lifetime, thus its stellar nature requires it to be a blue straggler. The large space velocity rules out a Galactic-disk ejection. Combining the HVS's observed trajectory, stellar nature, and required initial velocity, we conclude that HE 0437-5439 was most likely a compact binary ejected by the Milky Way's central black hole.
Anderson Jeffrey
Bond Howard E.
Brown Warren R.
Geller Margaret J.
Gnedin Oleg Yuri
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