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

2015/02/04 by Shoko Jin, Jin, Shoko, A. Helmi +5 · 1 citation
Earth and Planetary Sciences · Physics and Astronomy · #Astronomy #Astronomy and Astrophysical Research #Astrophysics #Astrophysics of Galaxies (astro-ph.GA) #Classical mechanics #Computer science #Dwarf galaxy #Dwarf spheroidal galaxy #FOS: Physical sciences #Galaxy #Geophysics and Gravity Measurements #Interacting galaxy #Local Group #Measure (data warehouse) #Milky Way #Motion (physics) #Physics #Proper motion #Stars #Stellar, planetary, and galactic studies #astro-ph.GA

paper · pdf · doi:10.48550/arxiv.1502.01215

5 pages, 1 figure; to appear in the proceedings of the GREAT-ITN conference on "The Milky Way Unravelled by Gaia", Barcelona (Dec 1-5 2014)

arxiv created 2015/02/04 · openalex publication_date 2015/02/04 · arxiv updated 2015/02/05 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

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.

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