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

Published online by Cambridge University Press:  01 July 2007

Will Clarkson ,
Kailash Sahu ,
Jay Anderson ,
T. Ed Smith ,
Thomas M. Brown ,
Stefano Casertano ,
R. Michael Rich ,
Howard E. Bond ,
Timothy Brown  and
Mario Livio
...Show all authors
Will Clarkson
Affiliation:
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA email: [email protected]
Kailash Sahu
Affiliation:
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA email: [email protected]
Jay Anderson
Affiliation:
Department of Physics and Astronomy, MS-108, Rice University, 6100 Main Street, Houston, TX-77005, USA
T. Ed Smith
Affiliation:
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA email: [email protected]
Thomas M. Brown
Affiliation:
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA email: [email protected]
Stefano Casertano
Affiliation:
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA email: [email protected]
R. Michael Rich
Affiliation:
UCLA, Los Angeles, California 90095-1562, USA
Howard E. Bond
Affiliation:
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA email: [email protected]
Timothy Brown
Affiliation:
Las Cumbres Observatory Global Telescope, 6740 Cortona Dr. Suite 102, Santa Barbara, CA 93117, USA
Mario Livio
Affiliation:
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA email: [email protected]
Dante Minniti
Affiliation:
Universidad Catolica de Chile, Av, Vicuna Mackenna 4680, Santiago 22, Chile
Nino Panagia
Affiliation:
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA email: [email protected]
Alvio Renzini
Affiliation:
INAF - Osservatorio di Padova, Vicolo dell'Osservatorio 5, 35122, Padova, Italy
Jeff Valenti
Affiliation:
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA email: [email protected]
Manuela Zoccali
Affiliation:
Universidad Catolica de Chile, Av, Vicuna Mackenna 4680, Santiago 22, Chile
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Abstract

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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.

Keywords

stars: kinematicsGalaxy: bulgeGalaxy: diskGalaxy: kinematics and dynamics
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S245: Formation and Evolution of Galaxy Bulges , July 2007 , pp. 361 - 362
Copyright
Copyright © International Astronomical Union 2008

References

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