Fig. 9
Link between dense gas fraction and SFR. The HCN/CO and HCO+/CO ratios are used to trace the fraction of dense molecular gas and the 24 μm intensity is used as a proxy for the SFR. HCN/CO is in black and HCO+/CO is in red. Observations are from Buchbender et al. (2013) and the present work. Typical uncertainties are 20% for HCO+/CO and 25% for the HCN/CO ratio.
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