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Caption: Figure 7.
Comparison of αCO values estimated via different prescriptions (B13, SL24, and T24*, which represent Equations (8)–(10)). The dashed lines indicate a one-to-one relation, and the thick dotted lines label the Galactic αCO value of 4.35 ﹩{M}_{\odot }\,{({\rm{K}}\,\mathrm{km}\,{{\rm{s}}}^{-1}\,{\mathrm{pc}}^{2})}^{-1}﹩. While the predicted αCO values do not agree well and show no systematic trend among different populations, the overall αCO variations are limited to a factor of 2 within and among prescriptions. The fractional αCO uncertainty in these prescriptions is within ±0.2 dex for T24* and ±0.3 dex for B13 and SL24.
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© 2026. The Author(s). Published by the American Astronomical Society.
