Stellar proper motions in the Galactic bulge with ACS/WFC on HST

Will Clarkson, Kailash Sahu, Jay Anderson, T. Ed Smith, Thomas M. Brown, Stefano Casertano, R. Michael Rich, Howard E. Bond, Timothy Brown, Mario Livio, Dante Minniti, Nino Panagia, Alvio Renzini, Jeff Valenti, Manuela Zoccali

Research output: Contribution to journalArticlepeer-review


In 2004 the Sagittarius Window Eclipsing Extrasolar Planet Search (SWEEPS) project undertook a very deep ACS/WFC exposure-set of the Sgr-I low-reddening window in the Galactic Bulge, with repeat observations 2.04 years later. The combination of superb first-epoch sampling, wide field of view and high PSF stability of ACS/WFC on Hubble allows proper motions to be extracted for more than 137,000 objects, over 85,000 to accuracy better than 0.3 mas yr 1. We present these proper motions and outline some of the uses to which they have been put, including the separation of a pure-Bulge sample and the inner Galactic rotation curve.

Original languageEnglish (US)
Pages (from-to)361-362
Number of pages2
JournalProceedings of the International Astronomical Union
Issue numberS245
StatePublished - Jul 2007

All Science Journal Classification (ASJC) codes

  • Medicine (miscellaneous)
  • Astronomy and Astrophysics
  • Nutrition and Dietetics
  • Public Health, Environmental and Occupational Health
  • Space and Planetary Science


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