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We present ALLSMOG, the APEX Low-redshift Legacy Survey for MOlecular Gas.ALLSMOG is a survey designed to observe the CO(2-1) emission line with the APEXtelescope, in a sample of local galaxies (0.01 < z < 0.03), with stellar massesin the range 8.5 < log(M*/Msun) < 10. This paper is a data release and initialanalysis of the first two semesters of observations, consisting of 42 galaxiesobserved in CO(2-1). By combining these new CO(2-1) emission line data witharchival HI data and SDSS optical spectroscopy, we compile a sample of low-massgalaxies with well defined molecular gas masses, atomic gas masses, andgas-phase metallicities. We explore scaling relations of gas fraction and gasconsumption timescale, and test the extent to which our findings are dependenton a varying CO/H2 conversion factor. We find an increase in the H2/HI massratio with stellar mass which closely matches semi-analytic predictions. Wefind a mean molecular gas fraction for ALLSMOG galaxies of MH2/M* = (0.09 -0.13), which decreases with stellar mass. We measure a mean molecular gasconsumption timescale for ALLSMOG galaxies of 0.4 - 0.7 Gyr. We also confirmthe non-universality of the molecular gas consumption timescale, which varies(with stellar mass) from ~100 Myr to ~2 Gyr. Importantly, we find that thetrends in the H2/HI mass ratio, gas fraction, and the non-universal moleculargas consumption timescale are all robust to a range of recentmetallicity-dependent CO/H2 conversion factors.

ALLSMOG: an APEX Low-redshift Legacy Survey for MOlecular Gas. I - molecular gas scaling relations, and the effect of the CO/H2 conversion factor