The peculiar cluster MACS J0417.5-1154 in the C and X-bands
  We present 5.5 and 9.0 GHz Australia Telescope Compact Array (ATCA)
observations of the cluster MACSJ0417.5-1154, one of the most massive galaxy
clusters and one of the brightest in X-ray in the Massive Cluster Survey
(MACS). We estimate diffuse emission at 5.5 and 9.0 GHz from our ATCA
observations, and compare the results with the 235 MHz and 610 MHz GMRT
observations and 1575 MHz VLA observations. We also estimate the diffuse
emission at low frequencies from existing GLEAM survey data (using the MWA
telescope), and find that the steepening reported in earlier studies may have
been an artefact of underestimates of diffuse emission at low frequencies.
High-frequency radio observations of galaxy cluster mergers therefore provide
an important complement to low-frequency observations, not only for a probing
the `on' and `off' state of radio halos in these mergers, but also to constrain
energetics of cluster mergers. We comment on the future directions that further
studies of this cluster can take.
