Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21541309n&link_type=abstract
American Astronomical Society, AAS Meeting #215, #413.09; Bulletin of the American Astronomical Society, Vol. 42, p.251
Astronomy and Astrophysics
Astronomy
Scientific paper
The number of known tidal debris streams in the Milky Way's halo has recently grown every year, particularly from analysis of SDSS/SEGUE data. In time we expect these streams will elucidate the merger history of the galaxy and allow us to determine the shape of the Milky Way's dark matter halo. In this paper I present several cases in which poor understanding of the observational data have led to misconceptions, controversies, or ambiguities in halo substructure; and outline the methods we are using to disentangle the growing number of these substructures. I argue that there is a need for more data, and in particular at least an order of magnitude or more spectra of Galactic stars. I present a plan for US Galactic astronomers to participate in the Chinese LAMOST project. The LEGUE survey associated with this project will carry out a spectroscopic survey of millions of Galactic stars starting in 2011. This project is funded by NSF AST grants 06-07618 and 08-09357.
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