천문학회보 (The Bulletin of The Korean Astronomical Society)
- 제46권1호
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- Pages.28.1-28.1
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- 2021
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- 1226-2692(pISSN)
Statistical Analysis of Interacting Dark Matter Halos: On two physically distinct interaction types
- An, Sung-Ho (Department of Astronomy& Center for Galaxy Evolution Research, Yonsei University) ;
- Kim, Juhan (Center for Advanced Computation, Korea Institute for Advanced Study) ;
- Moon, Jun-Sung (Department of Astronomy& Center for Galaxy Evolution Research, Yonsei University) ;
- Yoon, Suk-Jin (Department of Astronomy& Center for Galaxy Evolution Research, Yonsei University)
- 발행 : 2021.04.13
초록
We present a statistical analysis of dark matter halos with interacting neighbors using a set of cosmological simulations. We classify the neighbors into two groups based on the total energy (E12) of the target-neighbor system; flybying neighbors (E12 ≥ 0) and merging ones (E12 < 0). First, we find a different trend between the flyby and merger fractions in terms of the halo mass and large-scale density. The flyby fraction highly depends on the halo mass and environment, while the merger fraction show little dependence. Second, we measure the spin-orbit alignment, which is the angular alignment between the spin of a target halo (
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