We use the CN/CO intensity ratio to obtain the dense gas fraction, f _dense , for a sample of 16 ultraluminous and luminous infrared (IR) galaxies and compare f _dense with a suite of global galaxy properties.We find a significant correlation between f _dense and star formation rate calculated using both IR luminosities and Western Show Halters radio continuum, although there is significant scatter in each relation.We find no trend between global or peak f _dense and merger stage.
We find no correlation between global f _dense and X-ray luminosity; however, the correlation becomes significant when we measure f _dense at the location of peak MAGNESIUM BIS-GLYCINATE 140 X-ray emission.Our interpretation is that the dense gas is co-localized with strong X-ray emission from active galactic nuclei or strong central star formation.