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We present a cross-calibration of CO- and dust-based molecular gas masses at$z \leqslant 0.2$. Our results are based on a survey with the IRAM 30-mtelescope collecting CO(1-0) measurements of 78 massive ($\log M_{\star} /M_{\odot} > 10$) galaxies with known gas-phase metallicities, and with IRphotometric coverage from WISE (22 $\mu$m ) and Herschel SPIRE (250, 350, 500$\mu$m). We find a tight relation ($\sim 0.17$ dex scatter) between the gasmasses inferred from CO and dust continuum emission, with a minor systematicoffset of 0.05 dex. The two methods can be brought into agreement by applying ametallicity-dependent adjustment factor ($\sim 0.13$ dex scatter). Weillustrate that the observed offset is consistent with a scenario in which dusttraces not only molecular gas, but also part of the ${\rm H \small I}$reservoir, residing in the ${\rm H_2}$-dominated region of the galaxy.Observations of the CO(2-1) to CO(1-0) line ratio for two thirds of the sampleindicate a narrow range in excitation properties, with a median ratio ofluminosities $ \left\langle R_{21} \right\rangle \sim 0.64 $. Finally, we finddynamical mass constraints from spectral line profile fitting to agree wellwith the anticipated mass budget enclosed within an effective radius, once allmass components (stars, gas and dark matter) are accounted for.

Cross-calibration of CO- vs dust-based gas masses and assessment of the dynamical mass budget in Herschel-SDSS Stripe82 galaxies