Thick Disk Formation in a Lambda CDM Cosmology

Details Thick Disk Formation in a Lambda CDM Cosmology Thick Disk Formation in a Lambda CDM Cosmology

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...206.1306b&link_type=abstract

American Astronomical Society Meeting 206, #13.06; Bulletin of the American Astronomical Society, Vol. 37, p.452

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Results are presented of thick disk formation in a multi-million particle simulation created by the U Washington's "N-body Shop" with sub-kpc resolution. This simulation forms a realistic disk galaxy in a fully cosmological (Lambda CDM) context. Observational evidence suggests that merging makes the main contribution to the formation of a thick disk, but the question of whether mergers contribute directly to thick disk material or dynamically heat a pre-existing thin disk remains. The evolution of the disk in this simulation is free of numerical effects. We incorporate a realistic star formation and feedback recipe that reproduces a galaxy luminosity function in agreement with observations. We find that fewer than 10% of stars in the disk at the current epoch have been accreted from other satellite halos in the last ˜9 Gyr. Since other simulations have previously overproduced low mass halos, they have been unable to accurately explore the contribution of mergers to thick disk formation at any epoch.

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