Fig. 11.
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HCN/CO ratios vs. FUV field strength (upper) and CO FWHM (center) and ΣFIR in our sample and literature data (García-Burillo et al. 2012; Díaz-Santos et al. 2017). The FUV field is inferred using PDRTOOLBOX. There is no clear trend between the radiation field strength or CO line FWHM and the HCN/CO ratio. We find a tentative trend in increasing HCN/CO ratio with ΣFIR, potentially boosted by an X-ray bright AGN in SDP.9.
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