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We report the first detection of a hot molecular core outside our Galaxybased on radio observations with ALMA toward a high-mass young stellar object(YSO) in a nearby low metallicity galaxy, the Large Magellanic Cloud (LMC).Molecular emission lines of CO, C17O, HCO+, H13CO+, H2CO, NO, SiO, H2CS, 33SO,32SO2, 34SO2, and 33SO2 are detected from a compact region (0.1 pc) associatedwith a high-mass YSO, ST11. The temperature of molecular gas is estimated to behigher than 100 K based on rotation diagram analysis of SO2 and 34SO2 lines.The compact source size, warm gas temperature, high density, and rich molecularlines around a high-mass protostar suggest that ST11 is associated with a hotmolecular core. We find that the molecular abundances of the LMC hot core aresignificantly different from those of Galactic hot cores. The abundances ofCH3OH, H2CO, and HNCO are remarkably lower compared with Galactic hot cores byat least 1-3 orders of magnitude. We suggest that these abundances arecharacterized by the deficiency of molecules whose formation requires thehydrogenation of CO on grain surfaces. In contrast, NO shows a high abundancein ST11 despite the notably low abundance of nitrogen in the LMC. A multitudeof SO2 and its isotopologue line detections in ST11 imply that SO2 can be a keymolecular tracer of hot core chemistry in metal-poor environments. Furthermore,we find molecular outflows around the hot core, which is the second detectionof an extragalactic protostellar outflow. In this paper, we discuss physicaland chemical characteristics of a hot molecular core in the low metallicityenvironment.

Detection of a hot molecular core in the Large Magellanic Cloud with ALMA