CO(1–0) line luminosity as a function of M∗ (left panel), SFR (central panel), and SSFR (right panel) in log-log scale for a sample of local star-forming galaxies defined by the ALLSMOG survey and by the sub-sample of COLD GASS selected in Sect. 5. For the ALLSMOG sources observed only in their CO(2–1) transition (i.e. the APEX sample), has been computed from by assuming , consistent with previous observations of normal, low-M∗ star-forming galaxies, and the uncertainty on r21 is included in the error-bars. The empty symbols with downward arrows indicate the 3σ upper limits on estimated for the sources not detected in CO. The black dashed line indicates the best fit relation obtained from a Bayesian linear regression analysis conducted on the total sample, while the red dot and blue dot-dashed lines correspond to the best fit models obtained separately for the two samples of low-M∗ (log M∗ [M⊙] < 10.0) and high-M∗ (log M∗ [M⊙] ≥ 10.0) galaxies, respectively. The best-fit regression parameters and correlation coefficient resulting from the analysis of the total sample are reported on the plots, and the full parameter list can be found in Table 2. We do not plot the best-fit to the vs. SSFR relation because the (anti-)correlation between these two quantities is weak, but we still report the best fit parameters in Table 2.
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