Stellar proper motions in the Galactic bulge with ACS/WFC on HST
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.
- Publication:
-
Formation and Evolution of Galaxy Bulges
- Pub Date:
- July 2008
- DOI:
- 10.1017/S1743921308018127
- Bibcode:
- 2008IAUS..245..361C
- Keywords:
-
- stars: kinematics;
- Galaxy: bulge;
- Galaxy: disk;
- Galaxy: kinematics and dynamics