  Galaxy Zoo is the first study of nearby galaxies that contains reliable
information about the spiral sense of rotation of galaxy arms for a sizeable
number of galaxies. We measure the correlation function of spin chirality (the
sense in which galaxies appear to be spinning) of face-on spiral galaxies in
angular, real and projected spaces. Our results indicate a hint of positive
correlation at separations less than ~0.5 Mpc at a statistical significance of
2-3 sigma. This is the first experimental evidence for chiral correlation of
spins. Within tidal torque theory it indicates that the inertia tensors of
nearby galaxies are correlated. This is complementary to the studies of nearby
spin axis correlations that probe the correlations of the tidal field.
Theoretical interpretation is made difficult by the small distances at which
the correlations are detected, implying that substructure might play a
significant role, and our necessary selection of face-on spiral galaxies,
rather than a general volume-limited sample.
