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We report X-ray observations of two galaxy clusters Abell 1555 and Abell 1558with Suzaku, which are included in a large scale filamentary structure and asupercluster, to search for non-thermal emission driven by shocks produced instructure formation. These two clusters are detected by Suzaku/XIS for thefirst time in the X-ray band of 0.5-7 keV. No significant flux is detected byHXD in the energy band of 13-40 keV, and upper limits are reported. From theanalysis of the XIS data, we find that the spectrum of A1555 is fit by athermal plus power-law model, significantly better than a single-temperaturepure thermal spectrum. If this power-law component is due to inverse-Comptonscattering, the fraction of total baryon energy imparted to non-thermalelectrons is consistent with the typical value inferred from the observation ofother clusters. However, other scenarios (e.g., under lying AGNs,multi-temperature thermal models) cannot be excluded and further investigationof this system is desired. Basic physical properties of A1555 (e.g., totalmass) are also reported.

Suzaku Observation of Abell 1555 and Abell 1558: Searching for Non-thermal Emission from Large Scale Structure Formation