AGN outflows as neutrino sources: an observational test
  We test the recently proposed idea that outflows associated with Active
Galactic Nuclei (AGN) could be neutrino emitters in two complementary ways.
First, we cross-correlate a list of 94 "bona fide" AGN outflows with the most
complete and updated repository of IceCube neutrinos currently publicly
available, assembled by us for this purpose. It turns out that AGN with
outflows matched to an IceCube neutrino have outflow and kinetic energy rates,
and bolometric powers larger than those of AGN with outflows not matched to
neutrinos. Second, we carry out a statistical analysis on a catalogue of O III
5007 line profiles using a sample of 23,264 AGN at z < 0.4, a sub-sample of
which includes mostly possible outflows sources. We find no significant
evidence of an association between the AGN and the IceCube events, although we
get the smallest p-values (~ 6 and 18 per cent respectively, pre-trial) for
relatively high velocities and luminosities. Our results are consistent with a
scenario where AGN outflows are neutrino emitters but at present do not provide
a significant signal. This can be tested with better statistics and source
stacking. A predominant role of AGN outflows in explaining the IceCube data
appears in any case to be ruled out.
