The Bulletin of The Korean Astronomical Society (천문학회보)
- Volume 39 Issue 2
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- Pages.46-46
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- 2014
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- 1226-2692(pISSN)
Halo interactions in the Horizon run 4 simulation
- L'Huillier, Benjamin (School of Physics, Korea Institute for advanced Study) ;
- Park, Changbom (School of Physics, Korea Institute for advanced Study) ;
- Kim, Juhan (School of Physics, Korea Institute for advanced Study)
- Published : 2014.10.13
Abstract
Interactions such as mergers and flybys play a fundamental role in shaping galaxy morphology. We used the Horizon Run 4 cosmological N-body simulations to study the frequency and the type of halo interactions as a function of the environment, the separation p, the mass ratio q, and the target halo mass. We defined targets as haloes more massive than 10^11 Msun/h, and a target is interacting if it is located within the virial radius of a neighbour halo more massive than 0.4 times the target mass. We find that the interaction rate as a function of time has a universal shape for different halo mass and large-scale density, with an increase and saturation. Larger density yield steeper slopes and larger final interaction rates, while larger masses saturate later. Most interactions happen at large-scale density contrast
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