Linear Tidal Vestige found in the WM Sheet
Jounghun Lee (1), Suk Kim (2), Soo-Chang Rey (3) ((1) Seoul Nat'l U.,, (2) KASI, (3) Chungnam Nat'l U.)

TL;DR
This study detects a linear tidal influence on galaxy spin orientations within the WM sheet near the Virgo cluster, confirming the linear tidal torque model through observational data and analytic predictions.
Contribution
It provides the first observational evidence linking galaxy spin alignments in the WM sheet to linear tidal effects, validated by analytic modeling.
Findings
Weak, strong, and anti-alignments of galaxy spins with tidal principal directions.
Good quantitative agreement between observed and predicted spin alignments.
Confirmation of linear tidal torque influence in large-scale structure.
Abstract
We present a vestige of the linear tidal influence on the spin orientations of the constituent galaxies of the WM sheet discovered in the vicinity of the Virgo cluster and the Local Void. The WM sheet is chosen as an optimal target since it has a rectangular parallelepiped-like shape whose three sides are in parallel with the supergalactic Cartesian axes. Determining three probability density functions of the absolute values of the supergalactic Cartesian components of the spin vectors of the WM sheet galaxies, we investigate their alignments with the principal directions of the surrounding large-scale tidal field. When the WM sheet galaxies located in the central region within the distance of Mpc are excluded, the spin vectors of the remaining WM sheet galaxies are found to be weakly aligned, strongly aligned, and strongly anti-aligned with the minor, intermediate and major…
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