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We carried out new CO ($J=$1-0, 2-1 and 3-2) observations with NANTEN2 andASTE in the region of the twin Galactic mini-starbursts NGC 6334 and NGC 6357.We detected two velocity molecular components of 12 km s$^{-1}$ velocityseparation, which is continuous over 3 degrees along the plane. In NGC 6334 thetwo components show similar two-peaked intensity distributions toward the youngHII regions and are linked by a bridge feature. In NGC 6357 we found spatiallycomplementary distribution between the two velocity components as well as abridge feature in velocity. Based on these results we hypothesize that the twoclouds in the two regions collided with each other in the past few Myr andtriggered formation of the starbursts over $\sim$ 100 pc. We suggest that theformation of the starbursts happened toward the collisional region of $\sim$10-pc extents with initial high molecular column densities. For NGC 6334 wepresent a scenario which includes spatial variation of the colliding epoch dueto non-uniform cloud separation. The scenario possibly explains the apparentage difference among the young O stars in NGC 6334 raging from $10^4$ yrs to$10^6$ yrs; the latest collision happened within $10^5$ yrs toward the youngeststars in NGC 6334 I(N) and I which exhibit molecular outflows without HIIregions. For NGC 6357 the O stars were formed a few Myrs ago, and the clouddispersal by the O stars is significant. We conclude that cloud-cloud collisionoffers a possible explanation of the min-starburst over a 100-pc scale.

Molecular clouds in the NGC 6334 and NGC 6357 region; Evidence for a 100 pc-scale cloud-cloud collision triggering the Galactic mini-starbursts