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Disk Sizes in a ΛCDM Universe

Published online by Cambridge University Press:  01 June 2008

Qi Guo  and
Simon White
Qi Guo
Affiliation:
Max Planck Institut for Astrophysics, Postbus 85741, Garching, Germany email: [email protected]
Simon White
Affiliation:
Max Planck Institut for Astrophysics, Postbus 85741, Garching, Germany email: [email protected]
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Abstract

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We introduce a model which uses semi-analytic techniques to trace formation and evolution of galaxy disks in their cosmological context. For the first time we model the growth of gas and stellar disks separately. In contrast to previous work we follow in detail the angular momentum accumulation history through the gas cooling, merging and star formation processes. Our model successfully reproduces the stellar mass–radius distribution and gas-to-stellar disk size ratio distribution observed locally. We also investigate the dependence of clustering on galaxy size and find qualitative agreement with observation. There is still some discrepancy at small scale for less massive galaxies, indicating that our treatment of satellite galaxies needs to be improved.

Keywords

CosmologyGas DiskStellar DiskCorrelation Function
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Issue S254: The Galaxy Disk in Cosmological Context , June 2008 , pp. 411 - 416
Copyright
Copyright © International Astronomical Union 2009

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