  The integrated and differential fiducial cross sections for the production of
a W or Z boson in association with a high-energy photon are measured using pp
collisions at sqrt{s} = 7 TeV. The analyses use a data sample with an
integrated luminosity of 4.6 fb^{-1} collected by the ATLAS detector during the
2011 LHC data-taking period. Events are selected using leptonic decays of the W
and Z bosons (W(e nu,mu nu) and Z(e+ e-, mu+ mu-, nu nubar)) with the
requirement of an associated isolated photon. The data are used to test the
electroweak sector of the Standard Model and search for evidence for new
phenomena. The measurements are used to probe the anomalous WWgamma, ZZgamma
and Zgammagamma triple-gauge-boson couplings and to search for the production
of vector resonances decaying to Zgamma and Wgamma. No deviations from Standard
Model predictions are observed and limits are placed on anomalous
triple-gauge-boson couplings and on the production of new vector meson
resonances.
