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The Galactic Halo as seen by Pan-STARRS1

The Galactic Halo as seen by Pan-STARRS1

The Galactic Halo as seen by Pan-STARRS1

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Origin of Bifurcation<br />

Multiple wraps: unlikely<br />

Internal rotation: unlikely<br />

(Fellhauer+06, but see Yanny+09)<br />

(Peñarrubia+10, but see Peñarrubia+11)<br />

No evidence of internal rotation<br />

Existing sims disagree with trailing arm<br />

Double accretion Plausible Unknown.<br />

Complex dwarf structure Unknown.

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