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We present an archival Atacama Large Millimeter/submillimeter Array (ALMA)study of the CN N = 1 - 0 / CO J = 1 - 0 intensity ratio in nearby (z < 0.05)Ultra Luminous and Luminous Infrared Galaxies (U/LIRGs). We identify sixteenU/LIRGs that have been observed in both CN and CO lines at $\sim$ 500 pcresolution based on sixteen different ALMA projects. We measure the (CNbright)/CO and (CN bright)/(CN faint) intensity ratios at an ensemble ofmolecular clouds scales (CN bright = CN N = 1 - 0, J = 3/2 - 1/2; CN faint = CNN = 1 - 0, J = 1/2 - 1/2 hyperfine groupings). Our global measured (CNbright)/CO ratios range from 0.02-0.15 in LIRGs and 0.08-0.17 in ULIRGs. Weattribute the larger spread in LIRGs to the variety of galaxy environmentsincluded in our sample. Overall, we find that the (CN bright)/CO ratio ishigher in nuclear regions, where the physical and excitation conditions favourincreased CN emission relative to the disk regions. 10 out of 11 galaxies whichcontain well-documented active galactic nuclei show higher ratios in thenucleus compared to the disk. Finally, we measure the median resolved (CNbright)/(CN faint) ratio and use it to estimate the total integrated CN lineoptical depth in ULIRGs ($\tau \sim$ 0.96) and LIRGs ($\tau \sim$ 0.23). Theoptical depth difference is likely due to the higher molecular gas surfacedensities found in the more compact ULIRG systems.

Stored in the archives: Uncovering the CN/CO intensity ratio with ALMA in nearby U/LIRGs