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A Multitransition CO Study in the 30 Doradus Complex in the Large Magellanic Cloud

We have made a multitransition CO study of the largest H ii complex, the 30 Doradus nebula, in the Large Magellanic Cloud (LMC). This is the most luminous example of a starburst region in the Local Group. We have searched for12CO J = 7→6 emission toward the 30 Doradus complex with the Antarctic Submillimeter Telescope and Remote Observatory (AST/RO), located at 2847 m altitude at the Amundsen‐Scott South Pole Station. As a result, we have detected a12CO J = 7→6 emitting cloud near the 30 Doradus complex. The12CO J = 7→6/12CO J = 4→3 line temperature ratio in this region is approximately a factor of 2 higher than that observed near the Sgr B2 complex. A radiative transfer calculation using the line ratios shows that the core of massive star formation in the LMC is much warmer and denser than that of the Milky Way.