Astronomy and Astrophysics – Astronomy
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008dda....39.0101j&link_type=abstract
American Astronomical Society, DDA meeting #39, #1.01
Astronomy and Astrophysics
Astronomy
Scientific paper
The distributions of stars in the different components of galaxies are broadly described in terms of analytic density and velocity distributions functions that are constructed to be in equilibrium with the underlying potential. In the last decade, the stellar halos of the Milky Way and Andromeda galaxies have been mapped in exquisite detail, revealing that they are actually richly substructured in phase-space due to the presence of debris from tidally disrupted satellites. These observations are qualitatively consistent with our expectations for large galaxies formed hierarchically from smaller galaxies, but are they actually telling us anything more quantifiable? In this talk I will review the origin of these substructures and discuss what they can tell us about the history and total mass distributions of these galaxies.
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