Feedback Factory: Multiple faint radio-jets detected in a cluster at z=2
  We report the detection of multiple faint radio sources, that we identify as
AGN-jets, within CLJ1449+0856 at z=2 using 3 GHz VLA observations. We study the
effects of radio-jet based kinetic feedback at high redshifts, which has been
found to be crucial in low redshift clusters to explain the observed
thermodynamic properties of their ICM. We investigate this interaction at an
epoch featuring high levels of AGN activity and a transitional phase of ICM in
regards to the likelihood of residual cold-gas accretion. We measure a total
flux of $\rm 30.6 \pm 3.3~\mu Jy$ from the 6 detected jets. Their power
contribution is estimated to be $1.2 ~(\pm 0.6)~ \times 10^{44} ~\rm ergs~
s^{-1}$, although this value could be up to $4.7 ~ \times 10^{44} ~\rm ergs~
s^{-1}$. This is a factor $\sim 0.25 - 1.0$ of the previously estimated
instantaneous energy injection into the ICM of CLJ1449+0856 from AGN outflows
and star formation, that have already been found to be sufficient in globally
offsetting the cooling flows in the cluster core. In line with the already
detected abundance of star formation, this mode of feedback being distributed
over multiple sites, contrary to a single central source observed at low
redshifts, points to accretion of gas into the cluster centre. This also
suggests a 'steady state' of the cluster featuring non cool-core like
behaviour. Finally, we also examine the TIR-radio luminosity ratio for the
known sample of galaxies within the cluster core and find that dense
environments do not have any serious consequence on the compliance of galaxies
to the IR-radio correlation.
