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A recent study conducted using CALIFA survey data (Lee et al, 2019b) hasfound that the orbital motions of neighbor galaxies are coherent with the spindirection of a target galaxy on scales of many Megaparsecs. We study this socalled `large-scale coherence' phenomena using N-body cosmological simulations.We confirm a strong coherence signal within 1 Mpc/h of a target galaxy,reaching out to 6 Mpc/h. We divide the simulation halos into subsamples basedon mass, spin, merger history and local halo number density for both target andneighbor halos. We find a clear dependency on the mass of the target halo only.Another key parameter was the local number density of both target and neighborhalos, with high density regions such as clusters and groups providing thestrongest coherence signals, rather than filaments or lower density regions.However we do not find a clear dependency on halo spin or time since last majormerger. The most striking result we find is that the signal can be detected upto~15Mpc/h from massive halos. These result provide valuable lessons for howobservational studies could more clearly detect coherence, and we discuss theimplications of our results for the origins of large-scale coherence.

Unexpected dancing partners: Tracing the coherence between the spin and motion of dark matter halos