Stellar Proper Motions in the Galactic Bulge from Deep Hubble Space Telescope ACS WFC Photometry

We present stellar proper motions in the Galactic bulge from the Sagittarius Window Eclipsing Extrasolar Search (SWEEPS) project using ACS WFC on HST. Proper motions are extracted for more than 180,000 objects, with >81,000 measured to accuracy better than 0.3 mas yr super(-1) in both coordinates...

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Veröffentlicht in:	The Astrophysical journal 2008-09, Vol.684 (2), p.1110-1142
Hauptverfasser:	Clarkson, Will, Sahu, Kailash, Anderson, Jay, Smith, T. Ed, Brown, Thomas M, Rich, R. Michael, Casertano, Stefano, Bond, Howard E, Livio, Mario, Minniti, Dante, Panagia, Nino, Renzini, Alvio, Valenti, Jeff, Zoccali, Manuela
Format:	Artikel
Sprache:	eng
Schlagworte:	Astronomy Earth, ocean, space Exact sciences and technology
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Zusammenfassung:	We present stellar proper motions in the Galactic bulge from the Sagittarius Window Eclipsing Extrasolar Search (SWEEPS) project using ACS WFC on HST. Proper motions are extracted for more than 180,000 objects, with >81,000 measured to accuracy better than 0.3 mas yr super(-1) in both coordinates. We report several results based on these measurements: (1) Kinematic separation of bulge from disk allows a sample of >15,000 bulge objects to be extracted based on >=6 capital sigma detections of proper motion, with
ISSN:	0004-637X 1538-4357
DOI:	10.1086/590378