Evolution of faint radio sources in the VIDEO-XMM3 field
  It has been speculated that low luminosity radio-loud AGN have the potential
to serve as an important source of AGN feedback, and may be responsible for
suppressing star-formation activity in massive elliptical galaxies at late
times. As such the cosmic evolution of these sources is vitally important to
understanding the significance of such AGN feedback processes and their
influence on the global star-formation history of the universe. In this paper
we present a new investigation of the evolution of faint radio sources out to
$z{\sim}2.5$. We combine a 1 square degree VLA radio survey, complete to a
depth of 100 $\mu$Jy, with accurate 10 band photometric redshifts from the
VIDEO and CFHTLS surveys. The results indicate that the radio population
experiences mild positive evolution out to $z{\sim}1.2$ increasing their space
density by a factor of $\sim$3, consistent with results of several previous
studies. Beyond $z$=1.2 there is evidence of a slowing down of this evolution.
Star-forming galaxies drive the more rapid evolution at low redshifts,
$z{<}$1.2, while more slowly evolving AGN populations dominate at higher
redshifts resulting in a decline in the evolution of the radio luminosity
function at $z{>}$1.2. The evolution is best fit by pure luminosity evolution
with star-forming galaxies evolving as $(1+z)^{2.47\pm0.12}$ and AGN as
$(1+z)^{1.18\pm0.21}$.
