The Bulletin of The Korean Astronomical Society (천문학회보)
- Volume 38 Issue 1
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- Pages.34.2-34.2
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- 2013
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- 1226-2692(pISSN)
Excursion model for the spin distribution of dark matter halos
- Ahn, Jieun (School of Space Research, Kyung Hee University) ;
- Kim, Juhan (School of Physics, Korea Institute for Advanced Study) ;
- Shin, Jihye (Department of Astronomy and Space Science, Kyung Hee University) ;
- Kim, Sungsoo S. (School of Space Research, Kyung Hee University) ;
- Park, Changbom (School of Physics, Korea Institute for Advanced Study)
- Published : 2013.04.11
Abstract
Spin distribution of dark matter halos in a cosmological N-body simulation is well fitted by a log-normal distribution, but the origin of the log-normal like shape is still unknown. To understand the evolution of spin and the origin of spin distribution, we have studied the change of the angular momentum of simulated halos through their merging histories. First, we traced merging histories of the dark matter halos and measured the probability distribution of the angular momentum changes from a series of simulations. We were able to fit the angular momentum changes with the Gaussian distribution in spaces of M, spin,
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