The Emergence of the Thick Disk in a CDM Universe

Details The Emergence of the Thick Disk in a CDM Universe The Emergence of the Thick Disk in a CDM Universe

2004-05-17

arxiv.org/abs/astro-ph/0405306v1

Astrophys.J. 612 (2004) 894-899

Astronomy and Astrophysics

Astrophysics

accepted for publication in ApJ

Scientific paper

10.1086/422709

The disk galaxy simulated using our chemo-dynamical galaxy formation code, GCD+, is shown to have a thick disk component. This is evidenced by the velocity dispersion versus age relation for solar neighbourhood stars, which clearly shows an abrupt increase in velocity dispersion at lookback time of approximately 8 Gyrs, and is in excellent agreement with observation. These thick disk stars are formed from gas which 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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