Recent studies suggest that cluster-forming clumps are the parent objects of clusters and often display complex velocity structures with multiple components. One theory for these velocity fields is clump-clump collisions, which is thought to trigger cluster formation (e.g., Higuchi et al. 2010). However, other studies suggest that a single clump with rotation in infalling motion can explain these complex velocity structures (e.g., Shimoikura et al. 2016). Several hypotheses to explain complex velocity structures within clumps have been proposed, and the formation and evolution processes of clusters remain unclear.
We study the cluster formation in clumps by performing MHD simulations. We addressed two setup: the "Rotation Setup'' in which a single clump contracts with rotation, and the "Collision Setup'' in which two clumps collide and then rotate due to the off-center configuration. We identified bound cores and statistically examined their physical properties. As a result, we found some differences between cores formed through two setups in terms of angular momentum, internal magnetic field, and rotational energy. These differences might serve as clues to distinguish between the two setup observationally.