title: CO J=4-3 High-Velocity Cloud in the 30 Doradus Complex in the Large Magellanic Cloud

authors: Kim, S., Kim, H., Bak, J.-Y., Garcia, M., Brandl, B., Xiao, K., Walsh, W., Smith, R.C., & Youn, S.

abstract: We present the results of CO J = 2 !a 1 observations of the shell complex 30
Doradus in the Large Magellanic Cloud (LMC) using the Antarctic Submillimeter
Telescope and Remote Observatory (AST/RO). This is the one of the largest H II
complexes in the Local Group. We compare the CO J = 2 !a 1 observations
against previously made CO J = 4 !a 3 observations and analyze the spatial
distribution of young stellar objects (YSOs) within the cloud using the
Spitzer observations of the 30 Doradus complex. Both peaks of CO J = 2 !a 1
and J = 4 !a 3 emitting clouds coincide with the densest region of the
filaments in which multiple shells are colliding. The YSOs are clustered in
the southern ridge of the warm and dense molecular gas clouds traced by CO J =
4 !a 3, indicating a filamentary structure of star formation throughout 30
Doradus. We also find an excess of Class I YSO candidates close to the clouds, 
which likely represent the most recent phase of star formation in this region.
This is a region where the triggered star formation has actually occurred, and
newly formed stars may have produced such a high-velocity outflow through
interacting with the surrounding molecular cloud material.