The Emergence of the Thick Disk in a Cold Dark Matter Universe
Open accessAbstract
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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The most likely formation path for the thick disk is through gas-rich mergers, i.e., turbulent disks in which stars were forming during mergers.
“A comparison with data from RAVE and SDSS carried out later by Wilson et al. (2011) and Dierickx et al. (2010) showed that the most likely path was through gas-rich mergers, i.e., turbulent disks in which stars were forming during mergers (Brook et al. 2004).”
From Streams, Substructures, and the Early History of the Milky Way (2020) · cites this paper as Brook et al. 2004
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References 50 · Cited by 403
Research works printed but not linked: 3
- Padmanabhan, T. 1993, Structure Formation in the Universe (Cambridge: Cambridge Univ. Press)
- Quillen, A. C., & Garnett, D. 2001, in ASP Conf. Ser. 230, Galaxy Disks and Disk Galaxies, ed. G. Jose, S. J. Funes, & E. M. Corsini (San Francisco: ASP), 87
- M. Livio (Cambridge: Cambridge Univ. Press), in press
- Authors
- Brook, C. B., Kawata, D., Gibson, B. K., & Freeman, K. C.
- Affiliations
- Swinburne University of Technology (AU)
- Australian National University (AU)
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 2004-09-10
- Volume
- 612
- Issue
- 2
- Pages
- 894-899
- ISSN
- 0004-637X (ISSN-L)
- 1538-4357
- OpenAlex
- W1976255645
- Cited by
- 403
- References
- 50
- Citations by year
- 2026: 5 · 2025: 22 · 2024: 15 · 2023: 18 · 2022: 11 · 2021: 22 · 2020: 18 · 2019: 22 · 2018: 25 · 2017: 23 · 2016: 22 · 2015: 18 · 2014: 19 · 2013: 19 · 2012: 26
- FWCI
- 7.08
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- The Astrophysical Journal (publishedVersion)
- arXiv (Cornell University) (submittedVersion)
- CERN Document Server (European Organization for Nuclear Research) (submittedVersion)
- CLOK (University of Central Lancashire) (submittedVersion)
- UCL Discovery (University College London) (submittedVersion)
- Figshare (submittedVersion, cc-by)
- ANU Open Research (Australian National University) (submittedVersion)
- Swinburne figshare (Swinburne University of Technology) (submittedVersion)
- arXiv (Cornell University)
- Swinburne figshare (Swinburne University of Technology)
- Topics
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Galaxies: Formation, Evolution, Phenomena
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Stellar, planetary, and galactic studies
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astrophysics and Star Formation Studies
- Keywords
- thick disk, cold dark matter, disk galaxy formation, GCD, velocity dispersion, solar neighborhood stars, hierarchical clustering, gas accretion, Milky Way
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