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We present new large field observations of molecular clouds with NANTEN2toward the super star cluster NGC3603 in the transitions 12CO(J=2-1, J=1-0) and13CO(J=2-1, J=1-0). We suggest that two molecular clouds at 13 km s-1 and 28 kms-1 are associated with NGC3603 as evidenced by higher temperatures toward theH II region as well as morphological correspondence. The mass of the clouds istoo small to gravitationally bind them, given their relative motion of ~20 kms-1. We suggest that the two clouds collided with each other a Myr ago totrigger the formation of the super star cluster. This scenario is able toexplain the origin of the highest mass stellar population in the cluster whichis as young as a Myr and is segregated within the central sub-pc of thecluster. This is the second super star cluster along side Westerlund2 whereformation may have been triggered by a cloud-cloud collision.

Molecular Clouds Toward the Super Star Cluster NGC3603; Possible Evidence for a Cloud-Cloud Collision in Triggering the Cluster Formation