FIRST DETECTION OF 492 GHz [C I] EMISSION FROM THE LARGE MAGELLANIC CLOUD

摘要

The ~3P_1 → ~3P_0 fine-structure transition of neutral atomic carbon [C I] was observed with the Antarctic Submillimeter Telescope and Remote Observatory (AST/RO) toward two star-forming regions in the Large Magellanic Cloud: N159 and 30 Doradus. The [C I] line is weak in the vicinity of 30 Dor, a region with a uniquely hard and intense UV field. The I_([C I])/I_(CO) ratio in N159 is enhanced by a factor approx > 2 compared to the Milky Way Galaxy, a result attributable to the lower metallicity of the Large Magellanic Cloud.