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What can Gaia proper motions tell us about Milky Way dwarf galaxies?

Published online by Cambridge University Press:  17 July 2015

S. Jin ,
A. Helmi  and
M. Breddels
S. Jin
Affiliation:
Kapteyn Astronomical Institute, PO Box 800, 9700 AV Groningen, The Netherlands
A. Helmi
Affiliation:
Kapteyn Astronomical Institute, PO Box 800, 9700 AV Groningen, The Netherlands
M. Breddels
Affiliation:
Kapteyn Astronomical Institute, PO Box 800, 9700 AV Groningen, The Netherlands
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Abstract

We present a proper-motion study on models of the dwarf spheroidal galaxy Sculptor, based on the predicted proper-motion accuracy of Gaia measurements. Gaia will measure proper motions of several hundreds of stars for a Sculptor-like system. Even with an uncertainty on the proper motion of order 1.5 times the size of an individual proper-motion value of ∼10 mas/century, we find that it is possible to recover Sculptor's systemic proper motion at its distance of 79 kpc.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 68: The Milky Way Unravelled by Gaia: GREAT Science from the Gaia Data Releases , 2014 , pp. 241 - 245
Copyright
© EAS, EDP Sciences, 2015

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