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

Clarkson, W; Sahu, K; Smith T.E.; Brown, T. M.; Casertano, S; Bond H.E.; Livio, M; Panagia N.; Valenti, J; Anderson, J; Rich, R. M.; Brown T.; Minniti, D; Zoccali, M; Renzini, A

Abstract

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. © 2008 Copyright International Astronomical Union 2008.

Más información

Título de la Revista: Proceedings of the International Astronomical Union
Volumen: 3
Número: S245
Editorial: Cambridge University Press
Fecha de publicación: 2007
Página de inicio: 361
Página final: 362
URL: http://www.scopus.com/inward/record.url?eid=2-s2.0-46749135272&partnerID=q2rCbXpz