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Studying Evolution of the Galactic Potential and Halo Streamers with Future Astrometric Sat.pdf

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Studying Evolution of the Galactic Potential and Halo Streamers with Future Astrometric Sat

Studying Evolution of the Galactic Potential and Halo Streamers with Future Astrometric Satellites 1 2 3 HongSheng Zhao , Kathryn V. Johnston , David N. Spergel Lars Hernquist4 9 9 Abstract. Future astrometric satellites, such as SIM (NASA’s Space 9 Interferometric Mission) and GAIA (ESA’s Global Astrometric Interfer- 1 ometer for Astrophysics), hold the promise of mapping out the detailed n phase space structure of the Galactic halo by providing unprecedented a annual proper motion and parallax of 1 − 10as astrometric accuracy. J Here we show that proper motions of hundred or so giant branch stars 7 in a tidal debris torn from a small satellite (a 105−7L⊙ Galactic dwarf 1 galaxy or globular cluster) in the halo is sensitive to the current Galactic v potential and its past evolution. We follow the evolution of a cold (veloc- 1 ity dispersion of 10 km/s) stream on a nearby (between 8-50 kpc) polar 7 orbit in a variety of histories of the potential of the Galaxy, and observe 0 the bright (V 18mag) members of the debris tail with GAIA accuracy. 1 0 We simulate eﬀects due to the growin