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