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Date and Time of the Query: 2019-08-17 T11:33:06 PDT
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For refcode 2014MNRAS.445.2599B:
Retrieve 42 NED objects in this reference.
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Copyright by Royal Astronomical Society. 2014MNRAS.445.2599B ALLSMOG: an APEX Low-redshift Legacy Survey for MOlecular Gas - I. Molecular gas scaling relations, and the effect of the CO/H_2_ conversion factor Bothwell, M. S.; Wagg, J.; Cicone, C.; Maiolino, R.; Moller, P.; Aravena, M.; De Breuck, C.; Peng, Y.; Espada, D.; Hodge, J. A.; Impellizzeri, C. M. V.; Martin, S.; Riechers, D.; Walter, F. Abstract. 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 APEX telescope, in a sample of local galaxies (0.01 < z < 0.03), with stellar masses in the range 8.5 < log(M_*_/M_sun_) < 10. This paper is a data release and initial analysis of the first two semesters of observations, consisting of 42 galaxies observed in CO(2 - 1). By combining these new CO(2 - 1) emission line data with archival H I data and SDSS optical spectroscopy, we compile a sample of low-mass galaxies with well-defined molecular gas masses, atomic gas masses, and gas-phase metallicities. We explore scaling relations of gas fraction and gas consumption time-scale, and test the extent to which our findings are dependent on a varying CO/H_2_ conversion factor. We find an increase in the H_2_/H I mass ratio with stellar mass which closely matches semi-analytic predictions. We find a mean molecular gas fraction for ALLSMOG galaxies of M_H2_/M_*_ = (0.09-0.13), which decreases with stellar mass. This decrease in total gas fraction with stellar mass is in excess of some model predictions at low stellar masses. We measure a mean molecular gas consumption time-scale for ALLSMOG galaxies of 0.4-0.7 Gyr. We also confirm the non-universality of the molecular gas consumption time-scale, which varies (with stellar mass) from ~100 Myr to ~2 Gyr. Importantly, we find that the trends in the H_2_/H I mass ratio, gas fraction, and the non-universal molecular gas consumption time-scale are all robust to a range of recent metallicity-dependent CO/H_2_ conversion factors. Key words: galaxies: abundances, galaxies: evolution, galaxies: formation, galaxies: statistics
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