Statistics and Temperatures of Hot Molecular Cores in 30 Massive Star-Forming Regions of the MagMaR Survey

ABSTRACT :
This study presents initial findings on hot core chemistry using data from the Magnetic Fields in Massive Star-forming Regions (MagMaR) survey. The high sensitivity of the MagMaR data allowed us to identify over a hundred hot molecular cores (HMCs) in 30 massive star-forming regions, more than doubling the number previously detected in the same regions by the DIHCA survey. This sensitivity enables chemical comparisons between the brightest central cores and lower-mass isolated cores forming within the same environments. HMCs were identified based on emission from more than three complex organic molecule (COM) transitions. Utilizing the XCLASS package for molecular line modeling, our search for molecular lines within the HMCs revealed up to 14 oxygen-bearing, 11 nitrogen-bearing, and 1 sulfur-bearing COMs. Temperature maps of the HMCs were constructed using optically thin lines, including high ro-vibrational lines and isotopologues of CH3OH, CH3CN, and other COMs. Our analysis includes a comparison of the temperature distributions for different molecules within IRAS18089, which showcases the highest number of COMs detected among the MagMaR HMCs.