Mathematics – Logic
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21320105r&link_type=abstract
American Astronomical Society, AAS Meeting #213, #201.05; Bulletin of the American Astronomical Society, Vol. 41, p.265
Mathematics
Logic
Scientific paper
Studies of resolved stellar populations in galaxies like the Milky Way are an opportunity to look for the evidence of the earliest stages of hierarchical galaxy formation as it is imprinted on the kinematics and chemical abundance distributions of the oldest, most metal-poor stars. The statistics of substructure and surviving satellites are one of the only available observational tests of cosmological models on the smallest scales, and of our understanding of how stars populate the lowest mass dark matter halos. The SEGUE survey in SDSS-II has amassed a database of 240,000 stellar spectra with radial velocities and metallicities, with the goal of building a picture of the early star formation and accretion history of the Galaxy and testing models of galaxy formation. I will review what SEGUE data have been able to tell us about the formation of the halo and old disk from stellar kinematics and abundances, the mass distribution of the Galaxy, and the distribution of substructure in the old components of the Galaxy.
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