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070912

-              v5
+              v6
 Astronomy Colloquium / Fall 2007
     Hsiao-Wen Chen
  (Chicago)
+    Eline Tolstoy
+    (kapteyn Institute, Groningen)
     Halo Occupation of Dark Baryons
+    Galactic Archaeology
-Observations of QSO absorption-line systems have revealed a wealth of information for the intergalactic medium from the nearby universe all the way to the epoch of reionization.  These absorbers
-offer a powerful tool for mapping the dark universe, but their correlation with known stellar populations has always been ambiguous.  I will describe on-going surveys of absorbers and galaxies along common lines of sight toward background quasars, for quantifying the cross-correlation between stars and gas.  I will also introduce a new technique we have developed for constraining the baryon content of known dark matter halos based on absorption-line statistics.
+abstract:
+I will talk about using individual stars of all ages as probes of the history and evolution of star formation in small dwarf galaxies in the halo of the Milky Way.  I will talk about recent progress from large spectroscopic samples of individual stars collected by DART. These samples give us a detailed picture of abundance patterns & kinematics in these galaxies and how they have changed over time. These studies allow us to make a detailed comparison between the properties of stars found in dwarf galaxies and in larger systems like the Milky Way.