High Velocity Star Formation in the LMC

Astronomy and Astrophysics – Astrophysics

Scientific paper

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2 pages, to be published ApJL. Minor changes include new references

Scientific paper

Light-echo measurements show that SN1987A is 425 pc behind the LMC disk. It is continuing to move away from the disk at $18 \kms$. Thus, it has been suggested that SN1987A was ejected from the LMC disk. However, SN1987A is a member of a star cluster, so this entire cluster would have to have been ejected from the disk. We show that the cluster was formed in the LMC disk, with a velocity perpendicular to the disk of about $50 \kms$. Such high velocity formation of a star cluster is unusual, having no known counterpart in the Milky Way.

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