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Interstellar chemistry in low metallicity environments is crucial tounderstand chemical processes in the past metal-poor universe. Recent studiesof interstellar molecules in nearby low-metallicity galaxies have suggestedthat the metallicity has a significant effect on chemistry of star-formingcores. Here we report the first detection of a hot molecular core in theextreme outer Galaxy, which is an excellent laboratory to study star formationand interstellar medium in a Galactic low-metallicity environment. The targetstar-forming region, WB89-789, is located at the galactocentric distance of 19kpc. Our ALMA observations in 241-246, 256-261, 337-341, and 349-353 GHz havedetected a variety of carbon-, oxygen-, nitrogen-, sulfur-, and silicon-bearingspecies, including complex organic molecules (COMs) containing up to nineatoms, towards a warm (>100 K) and compact (<0.03 pc) region associated with aprotostar (~8x10^3 L_sun). Deuterated species such as HDO, HDCO, D2CO, andCH2DOH are also detected. A comparison of fractional abundances of COMsrelative to CH3OH between the outer Galactic hot core and an inner Galacticcounterpart shows a remarkable similarity. On the other hand, the molecularabundances in the present source do not resemble those of low-metallicity hotcores in the Large Magellanic Cloud. The results suggest that a great molecularcomplexity exists even in a primordial environment of the extreme outer Galaxy.The detection of another embedded protostar associated with high-velocity SiOoutflows is also reported.

The detection of a hot molecular core in the extreme outer Galaxy