Journal
ASTROPHYSICAL JOURNAL
Volume 612, Issue 2, Pages 894-899Publisher
UNIV CHICAGO PRESS
DOI: 10.1086/422709
Keywords
galaxies : evolution; galaxies : formation; Galaxy : disk
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The disk galaxy simulated using our chemodynamic galaxy formation code, GCD+, is shown to have a thick-disk component. This is evidenced by the velocity dispersion versus age relation for solar neighborhood stars, which clearly shows an abrupt increase in velocity dispersion at a look-back time of approximately 8 Gyr, and is in excellent agreement with observation. These thick-disk stars are formed from gas that is accreted to the galaxy during a chaotic period of hierarchical clustering at high redshift. This formation scenario is shown to be consistent with observations of both the Milky Way and extragalactic thick disks.
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