Spin Alignment in Analogues of The Local Sheet
  Tidal torque theory and simulations of large scale structure predict spin
vectors of massive galaxies should be coplanar with sheets in the cosmic web.
Recently demonstrated, the giants (K$_{s}$ $\leq$ -22.5 mag) in the Local
Volume beyond the Local Sheet have spin vectors directed close to the plane of
the Local Supercluster, supporting the predictions of Tidal Torque Theory.
However, the giants in the Local Sheet encircling the Local Group display a
distinctly different arrangement, suggesting that the mass asymmetry of the
Local Group or its progenitor torqued them from their primordial spin
directions. To investigate the origin of the spin alignment of giants locally,
analogues of the Local Sheet were identified in the SDSS DR9. Similar to the
Local Sheet, analogues have an interacting pair of disk galaxies isolated from
the remaining sheet members. Modified sheets in which there is no interacting
pair of disk galaxies were identified as a control sample.
  Galaxies in face-on control sheets do not display axis ratios predominantly
weighted toward low values, contrary to the expectation of tidal torque theory.
For face-on and edge-on sheets, the distribution of axis ratios for galaxies in
analogues is distinct from that in controls with a confidence of 97.6 $\%$ $\&$
96.9$\%$, respectively. This corroborates the hypothesis that an interacting
pair can affect spin directions of neighbouring galaxies.
