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We present the results of sulfur monoxide, SO line emission observations ofG0.253+0.016 with the Atacama Large Millimeter/submillimeter Array (ALMA) at anangular resolution of 1.7 arcsec. The dense and massive molecular cloud ofG0.253+0.016 is highly sub-structured, yet shows no obvious signs of clusterformation. We found three outstanding features of the cloud from the SOemission, namely, shell structure of radius 1.3 pc, large velocity gradients of20 km/s/pc with the cloud, and cores with large velocity dispersions (30-40km/s) around the shell structure. We suggest that these large-velocitydispersion cores will form high-mass stars in the future. In attempt to explorethe formation scenario of the dense cloud, we compared our results withnumerical simulations, thus, we propose that G0.253+0.016 may have formed dueto a cloud-cloud collision process.

ALMA view of G0.253+0.016: Can cloud-cloud collision form the cloud?