Measuring proper motions of galactic dwarf galaxies with Hubble Space Telescope

Details Measuring proper motions of galactic dwarf galaxies with Hubble Space Telescope Measuring proper motions of galactic dwarf galaxies with Hubble Space Telescope

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008iaus..248..244p&link_type=abstract

A Giant Step: from Milli- to Micro-arcsecond Astrometry, Proceedings of the International Astronomical Union, IAU Symposium, Vol

Statistics

Methodology

Astrometry, Galaxies: Dwarf, Local Group, Methods: Data Analysis

Scientific paper

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.

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