Spin alignments of spiral galaxies within the large-scale structure from
  SDSS DR7
  Using a sample of spiral galaxies selected from the Sloan Digital Sky Survey
Data Release 7 (SDSS DR7) and Galaxy Zoo 2 (GZ2), we investigate the alignment
of spin axes of spiral galaxies with their surrounding large scale structure,
which is characterized by the large-scale tidal field reconstructed from the
data using galaxy groups above a certain mass threshold. We find that the spin
axes of only have weak tendency to be aligned with (or perpendicular to) the
intermediate (or minor) axis of the local tidal tensor. The signal is the
strongest in a \cluster environment where all the three eigenvalues of the
local tidal tensor are positive. Compared to the alignments between halo spins
and local tidal field obtained in N-body simulations, the above observational
results are in best agreement with those for the spins of inner regions of
halos, suggesting that the disk material traces the angular momentum of dark
matter halos in the inner regions.
