The Detection of a Hot Molecular Core in the Extreme Outer Galaxy

Interstellar chemistry in low metallicity environments is crucial to understand chemical processes the past metal-poor universe. Recent studies of interstellar molecules nearby low-metallicity galaxies have suggested that has a significant effect on star-forming cores. Here we report first detection hot molecular core extreme outer Galaxy, which an excellent laboratory study star formation and medium Galactic environment. The target region, WB89-789, located at galactocentric distance 19 kpc. Our ALMA observations 241-246, 256-261, 337-341, 349-353 GHz detected variety carbon-, oxygen-, nitrogen-, sulfur-, silicon-bearing species, including complex organic (COMs) containing up nine atoms, towards warm (>100 K) compact (<0.03 pc) region associated with protostar (~8x10^3 L_sun). Deuterated species such as HDO, HDCO, D2CO, CH2DOH are also detected. A comparison fractional abundances COMs relative CH3OH between inner counterpart shows remarkable similarity. On other hand, present source do not resemble those cores Large Magellanic Cloud. results suggest great complexity exists even primordial environment Galaxy. another embedded high-velocity SiO outflows reported.