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- W1881709969 abstract "In this paper, we study the filamentary structures and the galaxy alignment along filaments at redshift z = 0.06 in the MassiveBlack-II simulation, a state-of-the-art, high-resolution hydrodynamical cosmological simulation which includes stellar and AGN feedback in a volume of (100 Mpc h−1)3. The filaments are constructed using the subspace constrained mean shift (SCMS; Ozertem & Erdogmus; Chen et al.). First, we show that reconstructed filaments using galaxies and reconstructed filaments using dark matter particles are similar to each other; over 50 per cent of the points on the galaxy filaments have a corresponding point on the dark matter filaments within distance 0.13 Mpc h−1 (and vice versa) and this distance is even smaller at high-density regions. Second, we observe the alignment of the major principal axis of a galaxy with respect to the orientation of its nearest filament and detect a 2.5 Mpc h−1 critical radius for filament's influence on the alignment when the subhalo mass of this galaxy is between 109 M⊙ h−1 and 1012 M⊙ h−1. Moreover, we find the alignment signal to increase significantly with the subhalo mass. Third, when a galaxy is close to filaments (less than 0.25 Mpc h−1), the galaxy alignment towards the nearest galaxy group is positively correlated with the galaxy subhalo mass. Finally, we find that galaxies close to filaments or groups tend to be rounder than those away from filaments or groups." @default.
- W1881709969 created "2016-06-24" @default.
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- W1881709969 date "2015-10-17" @default.
- W1881709969 modified "2023-10-03" @default.
- W1881709969 title "Investigating galaxy-filament alignments in hydrodynamic simulations using density ridges" @default.
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- W1881709969 doi "https://doi.org/10.1093/mnras/stv2260" @default.
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