The Formation of the Outer Halo and the Mass of the Galaxy

Details The Formation of the Outer Halo and the Mass of the Galaxy The Formation of the Outer Halo and the Mass of the Galaxy

Feb 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001noao.prop..365m&link_type=abstract

NOAO Proposal ID #2001A-0365

Physics

Scientific paper

With distant halo stars we can now map the outer Galactic halo, where previously only satellite galaxies and a few globular clusters were known. This is crucial for an understanding of the manner and timescale of the assembly of the Milky Way's stellar halo and the total mass and shape of its dark halo. Our previous work has proved that the Washington photometric system, in conjunction with spectroscopy, is capable of efficiently identifying halo giants out to 100 kpc or more. We request followup spectroscopy to map velocity substructure, more likely visible in the outer halo because of the long dynamical timescales (our early results give tantalizing suggestions of streams), and to utilize metal-poor giants to constrain the dark halo.

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