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• W3174816615 endingPage "86" @default.
• W3174816615 startingPage "86" @default.
• W3174816615 abstract "Spin–orbit alignment (SOA; i.e., the vector alignment between the halo spin and the orbital angular momentum of neighboring halos) provides an important clue to how galactic angular momenta develop. For this study, we extract virial-radius-wise contact halo pairs with mass ratios between 1/10 and 10 from a set of cosmological N-body simulations. In the spin–orbit angle distribution, we find a significant SOA in that 52.7% ± 0.2% of neighbors are on the prograde orbit. The SOA of our sample is mainly driven by low-mass target halos (<1011.5 h−1 M⊙) with close merging neighbors, corroborating the notion that tidal interaction is one of the physical origins of SOA. We also examine the correlation of SOA with the adjacent filament and find that halos closer to the filament show stronger SOA. Most interestingly, we discover for the first time that halos with the spin parallel to the filament experience most frequently prograde polar-interaction (i.e., fairly perpendicular but still prograde interaction; spin–orbit angle ∼70°). This instantly invokes the spin-flip event and the prograde-polar interaction will soon flip the spin of the halo to align it with the neighbor's orbital angular momentum. We propose that SOA originates from the local cosmic flow along the anisotropic large-scale structure, especially that along the filament, and grows further by interactions with neighbors." @default.
• W3174816615 created "2021-07-05" @default.
• W3174816615 creator A5001222858 @default.
• W3174816615 creator A5061433821 @default.
• W3174816615 creator A5067663363 @default.
• W3174816615 creator A5083716206 @default.
• W3174816615 date "2021-06-01" @default.
• W3174816615 modified "2023-09-25" @default.
• W3174816615 title "Living with Neighbors. IV. Dissecting the Spin–Orbit Alignment of Dark Matter Halos: Interacting Neighbors and the Local Large-scale Structure" @default.
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