Is the SMC Bound to the LMC? The Hubble Space Telescope Proper Motion of the SMC

@article{Kallivayalil2006IsTS,
  title={Is the SMC Bound to the LMC? The Hubble Space Telescope Proper Motion of the SMC},
  author={Nitya Kallivayalil and Roeland P. van der Marel and Charles R. Alcock},
  journal={The Astrophysical Journal},
  year={2006},
  volume={652},
  pages={1213-1229}
}
We present a measurement of the systemic proper motion of the Small Magellanic Cloud (SMC) made using the Advanced Camera for Surveys (ACS) on the Hubble Space Telescope (HST). We tracked the SMC's motion relative to four background QSOs over a baseline of approximately 2 yr. The measured proper motion is μW = -1.16 ± 0.18 mas yr-1, μN = -1.17 ± 0.18 mas yr-1. This is the best measurement yet of the SMC's proper motion. We combine this new result with our prior estimate of the proper motion of… 
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