Searching for Signatures of Radial Mixing in The Chemically Divided Galactic Disks
The Milky Way's thick disk was originally identified by fitting the vertical density distribution of stars to a double exponential profile. Recent investigations have shown that, in addition to being older, thick disk stars show chemical and kinematical properties distinct from the thin disk. Most scenarios of thick disk formation discussed to date
Lee, Young S. et al.
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2010