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Measuring proper motions of galactic dwarf galaxies with Hubble Space Telescope

Published online by Cambridge University Press:  01 October 2007

S. Piatek  and
C. Pryor
S. Piatek
Affiliation:
Department of Physics, New Jersey Institute of Technology, Newark, NJ 07102-1982, USA email: piatek@physics.rutgers.edu
C. Pryor
Affiliation:
Dept. of Physics and Astronomy, Rutgers, the State University of New Jersey136 Frelinghuysen Rd.Piscataway, NJ 08854–8019, USA email: pryor@physics.rutgers.edu
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Abstract

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Over the past several years, our research group has been measuring proper motions for nearby dwarf satellite galaxies using data taken with the Hubble Space Telescope. In order to measure proper motions with an expected size of several tens of milliarcseconds per century using a time baseline of 2-4 years, our work required that positions of stars and QSOs be measured to an accuracy of ~0.25 mas (~0.005 pixel). This contribution reviews the scientific justification of this work and our methodology. It concludes with a few general results and future directions.

Keywords

astrometrygalaxies: dwarfLocal Groupmethods: data analysis

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