ATCA observations of the MACS-Planck Radio Halo Cluster Project II.
  Radio observations of an intermediate redshift cluster sample
  A fraction of galaxy clusters host diffuse radio sources whose origins are
investigated through multi-wavelength studies of cluster samples. We
investigate the presence of diffuse radio emission in a sample of seven galaxy
clusters in the largely unexplored intermediate redshift range (0.3 < z <
0.44). In search of diffuse emission, deep radio imaging of the clusters are
presented from wide band (1.1-3.1 GHz), full resolution ($\sim$ 5 arcsec)
observations with the Australia Telescope Compact Array (ATCA). The
visibilities were also imaged at lower resolution after point source modelling
and subtraction and after a taper was applied to achieve better sensitivity to
low surface brightness diffuse radio emission. In case of non-detection of
diffuse sources, we set upper limits for the radio power of injected diffuse
radio sources in the field of our observations. Furthermore, we discuss the
dynamical state of the observed clusters based on an X-ray morphological
analysis with XMM-Newton. We detect a giant radio halo in PSZ2 G284.97-23.69
(z=0.39) and a possible diffuse source in the nearly relaxed cluster PSZ2
G262.73-40.92 (z=0.421). Our sample contains three highly disturbed massive
clusters without clear traces of diffuse emission at the observed frequencies.
We were able to inject modelled radio halos with low values of total flux
density to set upper detection limits; however, with our high-frequency
observations we cannot exclude the presence of RH in these systems because of
the sensitivity of our observations in combination with the high z of the
observed clusters.
