The emergence of the thick disk in a cold dark matter universe

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Title: The emergence of the thick disk in a cold dark matter universe
Author(s): Brook, Chris B.; Kawata, Daisuke; Gibson, Brad K.; Freeman, Ken C.
Abstract: 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.
Publication type: Journal article
Research centre: Swinburne University of Technology. School of Biophysical Sciences and Electrical Engineering. Centre for Astrophysics and Supercomputing
Source: Astrophysical Journal, Vol. 612, pt. 1 (2004), pp. 894-899
Publication year: 2004
Keyword(s): galaxies: evolution; galaxies: formation; Galaxy: disk
Publisher: University of Chicago Press
Format: pp. 894-899
ISSN: 0004-637X
Publisher URL: Astrophysical Journal
Publisher URL: http://dx.doi.org/10.1086/422709
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