Building on the archives: Connecting the CN/CO intensity ratio with global properties in nearby U/LIRGs

The Atacama Large Millimeter Array (ALMA) gives us access to the densest molecular gas on sub-kiloparsec scales, providing valuable insight into the physical and chemical processes that regulate star formation. We will present recent work on the CN (1-0)/CO (1-0) intensity ratio for a large sample of nearby Ultra-Luminous and Luminous Infrared Galaxies (U/LIRGs) utilizing the power of the ALMA archive. We identify 16 U/LIRGs which have been previously observed and detected in both the CN (1-0) and CO (1-0) lines at ∼500 parsec resolution based on 16 different ALMA projects. We will discuss how the CN/CO line ratio varies both within individual U/LIRGs and between ULIRGs and LIRGs as independent samples. The CN/CO line ratio is higher in ULIRGs than LIRGs, with a larger spread in the ratio measured for LIRGs due to the variety of galaxy environments included in our sample; e.g., starburst nuclei and quiescent disks, nearby galaxy mergers, and active galactic nuclei (AGN) in Seyfert galaxies. Additionally, we will present new results correlating the global CN/CO ratio in these extreme systems with global galaxy properties of total infrared luminosity, merger stage, AGN contribution, [CII] and [OI] luminosities, and star formation rate measured from both infrared luminosity and radio continuum.