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High-Velocity Star Formation in the Large Magellanic Cloud.

Graff, Gould

    The Astrophysical Journal
    |May 2, 2000
    PubMed
    Summary

    Supernova SN 1987A and its associated star cluster were not ejected from the Large Magellanic Cloud (LMC) disk. Instead, the cluster formed within the LMC disk with an unusually high velocity perpendicular to it.

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    Area of Science:

    • Astronomy and Astrophysics
    • Supernova Remnants
    • Star Cluster Dynamics

    Background:

    • Supernova SN 1987A is located 425 parsecs behind the Large Magellanic Cloud (LMC) disk and is moving away at 18 km/s.
    • Previous hypotheses suggested SN 1987A was ejected from the LMC disk, implying its entire star cluster was also ejected.

    Purpose of the Study:

    • To investigate the origin of SN 1987A and its associated star cluster.
    • To determine if the cluster was ejected from the LMC disk or formed within it.

    Main Methods:

    • Analysis of light-echo measurements of SN 1987A.
    • Modeling of star cluster formation and dynamics within the LMC.

    Main Results:

    • SN 1987A and its star cluster were formed within the LMC disk.
    • The cluster exhibits a high velocity (approximately 50 km/s) perpendicular to the LMC disk, indicating unusual formation conditions.
    • This high-velocity formation has no known parallel in the Milky Way.

    Conclusions:

    • The observed motion of SN 1987A is consistent with its star cluster forming within the LMC disk, not being ejected from it.
    • The formation of star clusters with such high perpendicular velocities is a rare phenomenon, challenging existing models of star formation in galaxies.

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