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Clusters of galaxies are among the best candidates for particle accelerationsources in the universe, a signature of which is non-thermal hard X-rayemission from the accelerated relativistic particles. We present early resultson Suzaku observations of non-thermal emission from Abell 3376, which is anearby on-going merger cluster. Suzaku observed the cluster twice, focusing onthe cluster center containing the diffuse radio emission to the east, andcluster peripheral region to the west. For both observations, we detect noexcess hard X-ray emission above the thermal cluster emission. An upper limiton the non-thermal X-ray flux of $2.1\times10^{-11}$ erg cm$^{-2}$ s$^{-1}$(15--50 keV) at the 3$\sigma$ level from a $34\times34$ arcmin$^2$ region,derived with the Hard X-ray Detector (HXD), is similar to that obtained withthe BeppoSAX/PDS. Using the X-ray Imaging Spectrometer (XIS) data, the upperlimit on the non-thermal emission from the West Relic is independentlyconstrained to be $<1.1\times10^{-12}$ erg s$^{-1}$ cm$^{-2}$ (4$-$8 keV) atthe 3$\sigma$ level from a 122 arcmin$^2$ region. Assuming Compton scatteringbetween relativistic particles and the cosmic microwave background (CMB)photons, the intracluster magnetic field $B$ is limited to be $>0.03\mu$G (HXD)and $>0.10\mu$G (XIS).

Constraint of Non-thermal X-ray Emission from the On-going Merger Cluster Abell 3376 with Suzaku