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We use Hubble Space Telescope imaging to measure the absolute proper motionof the hypervelocity star (HVS) HE 0437-5439, a short-lived B star located inthe 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 MilkyWay; 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-sequencelifetime, thus its stellar nature requires it to be a blue straggler. The largespace velocity rules out a Galactic-disk ejection. Combining the HVS's observedtrajectory, stellar nature, and required initial velocity, we conclude that HE0437-5439 was most likely a compact binary ejected by the Milky Way's centralblack hole.

A Galactic Center Origin for HE 0437-5439, the Hypervelocity Star near the Large Magellanic Cloud