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30 Doradus C is a superbubble which emits the brightest nonthermal X- and TeVgamma-rays in the Local Group. In order to explore detailed connection betweenthe high energy radiation and the interstellar medium, we have carried out newCO and HI observations using the Atacama Large Millimeter$/$Submillimeter Array(ALMA), Atacama Submillimeter Telescope Experiment, and the Australia TelescopeCompact Array with resolutions of up to 3 pc. The ALMA data of $^{12}$CO($J$ =1-0) emission revealed 23 molecular clouds with the typical diameters of$\sim$6-12 pc and masses of $\sim$600-10000 $M_{\odot}$. The comparison withthe X-rays of $XMM$-$Newton$ at $\sim$3 pc resolution shows that X-rays areenhanced toward these clouds. The CO data were combined with the HI to estimatethe total interstellar protons. Comparison of the interstellar proton columndensity and the X-rays revealed that the X-rays are enhanced with the totalproton. These are most likely due to the shock-cloud interaction modeled by themagnetohydrodynamical simulations (Inoue et al. 2012, ApJ, 744, 71). Further,we note a trend that the X-ray photon index varies with distance from thecenter of the high-mass star cluster, suggesting that the cosmic-ray electronsare accelerated by one or multiple supernovae in the cluster. Based on theseresults we discuss the role of the interstellar medium in cosmic-ray particleacceleration.

Associated molecular and atomic clouds with X-ray shell of superbubble 30 Doradus C in the LMC