Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dda....37.0601m&link_type=abstract
American Astronomical Society, DDA meeting #37, #6.01; Bulletin of the American Astronomical Society, Vol. 38, p.669
Astronomy and Astrophysics
Astronomy
Scientific paper
Recent detailed investigations revealing substantial substructure in the distribution and dynamics of stars in the Galactic halo would seem to be bearing out the basic tenets of standard LCDM models of the hierarchical growth of galaxies in the universe; yet some apparent discrepancies between the models and observations remain. The discovery and mapping of long, coherent streams of tidal debris from disrupted Galactic satellites enables new tests of the standard structural evolution models. Apart from their obvious usefulness in demonstrating in detail the hierarchical growth of the Milky Way, the dynamical coldness and coherence of halo tidal streams make them sensitive probes of the Galactic potential, and can be used to measure its shape, lumpiness and strength. The addition of valuable proper motion data from future space-based astrometric missions, like SIM Planetquest, will dramatically increase the sensitivity of tidal streams as dynamical probes.
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