Complex Organic Molecules Detected in 12 High-mass Star-forming Regions with Atacama Large Millimeter/submillimeter Array

Abstract Recent astrochemical models and experiments have explained that complex organic molecules (COMs; composed of six or more atoms) are produced on the dust grain mantles in cold dense gas prestellar cores. However, detailed chemical processes roles physical conditions chemistry still far from understood. To address these questions, we investigated 12 high-mass star-forming regions using Atacama Large Millimeter/submillimeter Array (ALMA) Band 6 observations. They associated with 44/95 GHz class I 6.7 II CH 3 OH masers, indicative undergoing active accretion. We found 28 hot cores COM emission among 68 continuum peaks at 1.3 mm specified 10 masers. Up to 19 COMs identified including oxygen- nitrogen-bearing their isotopologues The derived abundances show a good agreement those other low- regions, implying is predominantly set by ice core stage. One clear trend detection rate steeply grows column density, which can be attributed efficient formation In addition, maser tend enriched COMs. Finally, our results suggest enhanced several could originated accretion as well different