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The Young Massive Star Cluster Westerlund 2 Observed with MUSE. I. First Results on the Cluster Internal Motion from Stellar Radial Velocities
© 2018. The American Astronomical Society. All rights reserved. Westerlund 2 (Wd2) is the central ionizing star cluster of the H ii region RCW 49 and the second most massive young star cluster () in the Milky Way. Its young ...