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This paper reports on the Suzaku results of thermal and non-thermal featuresof 30 Dor C, a supernova remnant (SNR) in a superbubble of the Large MagellanicCloud (LMC). The west rim exhibits a non-thermal X-ray spectrum with no thermalcomponent. A single power-law model is rejected but a power-law model withspectral cutoff is accepted. The cutoff frequency of $(3-7)\times 10^{17}$ Hzis the highest among the shell type SNRs like SN 1006 ($\sim 6\times 10^{16}$Hz), and hence 30 Dor C would be the site of the highest energy accelerator ofthe SNR shock. The southeast (SE) and northeast (NE) rims have both the thermaland non-thermal components. The thin-thermal plasmas in the both rims are incollisional ionization equilibrium state. The electron temperature of theplasma in the SE rim ($kT_e \sim 0.7$ keV) is found to be higher than thepreviously reported value. The power-law index from SE is nearly the same as,while that from the NE is larger than that of the West rim. The SNR age wouldbe in the range of $(4-20)\times 10^3$ yr. Thus, 30 Dor C is likely to be theoldest shell-like SNR with non-thermal emission.

Suzaku Observation of 30Dor C: A Supernova Remnant with the Largest Non-Thermal Shell