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We report the Australia Telescope Compact Array 16 cm observation of CIZAJ1358.9-4750. Recent X-ray studies imply that this galaxy cluster is composedof merging, binary clusters. Using the EW367 configuration, we found nosignificant diffuse radio emission in and around the cluster. An upper limit ofthe total radio power at 1.4 GHz is $\sim 1.1 \times 10^{22}$ Watt/Hz in $30$square arcminutes which is a typical size of radio relics. It is known that anempirical relation holds between the total radio power and X-ray luminosity ofthe host cluster. The upper limit is about one order of magnitude lower thanthe power expected from the relation. Very young ($\sim 70$ Myr) shocks withlow Mach numbers ($\sim 1.3$), which are often seen at an early stage of mergersimulations, are suggested by the previous X-ray observation. The shocks maygenerate cosmic-ray electrons with a steep energy spectrum, which is consistentwith non-detection of bright ($>10^{23}$ Watt/Hz) relic in this 16 cm bandobservation. Based on the assumption of energy equipartition, the upper limitgives the magnetic-field strength below $0.68f(D_{\rm los}/{\rm1~Mpc})^{-1}(\gamma_{\rm min}/200)^{-1}$ $\mu$G, where $f$ is the cosmic-raytotal energy density over the cosmic-ray electron energy density, $D_{\rm los}$is the depth of the shock wave along the sightline and $\gamma_{\rm min}$ isthe lower cutoff Lorentz factor of the cosmic-ray electron energy spectrum.

ATCA 16 cm Observation of CIZA J1358.9-4750: Implication of Merger Stage and Constraint on Non-Thermal Properties