  (abridged) The Pierre Auger Collaboration has reported 27 Ultra-High Energy
Cosmic Ray Events (UHECRs) with energies above 56 EeV and well determined
arrival directions as of 2007 August 31. They find that the arrival directions
are not isotropic, but instead appear correlated with the positions of nearby
AGNs. Our aim was to determine the sources of these UHECRs by comparing their
arrival directions with more comprehensive source catalogs.
  Four (eight) of the 27 UHECRs with energy >56EeV detected by the Pierre Auger
Observatory have arrival directions within 1.5deg (3.5deg) of the extended
(>180kpc) radio structures of nearby radiogalaxies or the single nearby BLLac
with extended radio structure. Conversely the radio structures of three (six)
of all ten nearest extended radiogalaxies are within 1.5deg (3.5deg) of a
UHECR; three of the remaining four radiogalaxies are in directions with lower
exposure times. This correlation between nearby extended radiogalaxies and a
subset of UHECRs is significant at the 99.9% level. This is the first direct
observational proof that radio galaxies are a significant source of UHECRs. For
the remaining ~20 UHECRs, an isotropic distribution cannot be ruled out at high
significance. The correlation found by the Auger Collaboration between the 27
UHECRs and AGNs in the Veron-Cetty & Veron catalog at D < 71Mpc has a much
lower significance when one considers only the ~20 UHECRs not `matched' to
nearby extended radiogalaxies. No correlation is seen between UHECRs and
supernovae, supernova remnants, nearby galaxies, or nearby groups and clusters
of galaxies. The primary difference between the UHECR detections at the Pierre
Auger Observatory and previous experiments may thus be that the Southern
Hemisphere is more privileged with respect to nearby extended radiogalaxies.
