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Paper: A Sharper Look at the Motion of Stars in the Arches with Keck-LGS Adaptive Optics
Volume: 439, The Galactic Center: a Window to the Nuclear Environment of Disk Galaxies
Page: 119
Authors: Clarkson, W.; Lu, J. R.; Ghez, A. M.; Morris, M. R.; McCrady, N.; Stolte, A.; Yelda, S.
Abstract: We report on our ongoing multi-epoch Keck/NIRC2 imaging campaign towards the Arches, the young (≈2My), massive (∼few × 104 M) starburst cluster found only 30pc in projection from the Galactic Center. We improved the precision of proper motion in the Arches by a factor five by using a Keck-only dataset. Using these measurements along with new proper motion analysis techniques, we measure the intrinsic velocity dispersion of the Arches for the first time and produce the first kinematic mass estimate of (24< M < 51)×103 M.
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