2021PASJ...73.1540T

We have conducted mapping observations toward the n3 and n5 positions in the NGC 2264-D cluster-forming region with the Atacama Compact Array (ACA) of the Atacama Large Millimeter/submillimeter Array (ALMA) in Band 3. Observations with a 10000 au scale beam reveal the chemical composition at the clump scale. The spatial distributions of the observed low upper-state-energy lines of CH₃OH are similar to those of CS and SO, and the HC₃N emission seems to be predominantly associated with clumps containing young stellar objects. The turbulent gas induced by the star formation activities produces large-scale shock regions in NGC 2264-D, which are traced by the CH₃OH, CS, and SO emissions. We derive the HC₃N, CH₃CN, and CH₃CHO abundances with respect to CH₃OH. Compared to the n5 field, the n3 field is farther (in projected apparent distance) from the neighboring NGC 2264-C, yet the chemical composition in the n3 field tends to be similar to that of the protostellar candidate CMM3 in NGC 2264-C. The HC₃N/CH₃OH ratios in the n3 field are higher than those in the n5 field. We find an anti-correlation between the HC₃N/CH₃OH ratio and their excitation temperatures. The low HC₃N/CH₃OH abundance ratio at the n5 field implies that the n5 field is an environment with more active star formation compared with the n3 field.