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In this paper, we study the filamentary structures and the galaxy alignmentalong filaments at redshift $z=0.06$ in the MassiveBlack-II simulation, astate-of-the-art, high-resolution hydrodynamical cosmological simulation whichincludes stellar and AGN feedback in a volume of (100 Mpc$/h$)$^3$. Thefilaments are constructed using the subspace constrained mean shift (SCMS;Ozertem & Erdogmus (2011) and Chen et al. (2015a)). First, we show thatreconstructed filaments using galaxies and reconstructed filaments using darkmatter particles are similar to each other; over $50\%$ of the points on thegalaxy filaments have a corresponding point on the dark matter filaments withindistance $0.13$ Mpc$/h$ (and vice versa) and this distance is even smaller athigh-density regions. Second, we observe the alignment of the major principalaxis of a galaxy with respect to the orientation of its nearest filament anddetect a $2.5$ Mpc$/h$ critical radius for filament's influence on thealignment when the subhalo mass of this galaxy is between $10^9M_\odot/h$ and$10^{12}M_\odot/h$. Moreover, we find the alignment signal to increasesignificantly with the subhalo mass. Third, when a galaxy is close to filaments(less than $0.25$ Mpc$/h$), the galaxy alignment toward the nearest galaxygroup depends on the galaxy subhalo mass. Finally, we find that galaxies closeto filaments or groups tend to be rounder than those away from filaments orgroups.

Investigating Galaxy-Filament Alignments in Hydrodynamic Simulations using Density Ridges