Evidence for the alignment of quasar radio polarizations with large
  quasar group axes
  Recently, evidence has been presented for the polarization vectors from
quasars to preferentially align with the axes of the large quasar groups (LQG)
to which they belong. This report was based on observations made at optical
wavelengths for two large quasar groups at redshift $\sim 1.3$. The correlation
suggests that the spin axes of quasars preferentially align with their
surrounding large-scale structure that is assumed to be traced by the LQGs.
Here, we consider a large sample of LQGs built from the Sloan Digital Sky
Survey DR7 quasar catalogue in the redshift range $1.0-1.8$. For quasars
embedded in this sample, we collected radio polarization measurements with the
goal to study possible correlations between quasar polarization vectors and the
major axis of their host LQGs. Assuming the radio polarization vector is
perpendicular to the quasar spin axis, we found that the quasar spin axis is
preferentially parallel to the LQG major axis inside LQGs that have at least
$20$ members. This result independently supports the observations at optical
wavelengths. We additionally found that when the richness of an LQG decreases,
the quasar spin axis becomes preferentially perpendicular to the LQG major axis
and that no correlation is detected for quasar groups with fewer than $10$
members.
