Comparison of the retrieved αCO conversion factor to the SFR for each individual snapshot of the SB merger model (top – averaged over three projections for each snapshot). A clear correlation is found between SFR and αCO within the SB merger galaxy type, and the intrinsic variations in the SFR in the SB merger model induce a larger scatter in αCO than for isolated disk models. This indicates that stronger starbursts could have even lower αCO factors, given that the merger model used here is moderately starbursting about at the LIRG/ULIRG transition regime. In contrast, other galaxy types do not follow this αCO–SFR trend retrieved for the SB merger snapshots (bottom). In particular, high-z disks have an SFR that is almost as high as some SB merger snapshots, but with much higher αCO (see also Fig. 11).
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