VALES - III. The calibration between the dust continuum and interstellar gas content of star-forming galaxies

T. M. Hughes, E. Ibar, V. Villanueva, M. Aravena, M. Baes, N. Bourne, A. Cooray, L. J. M. Davies, S. Driver, L. Dunne, S. Dye, S. Eales, C. Furlanetto, R. Herrera-Camus, R. J. Ivison, E. van Kampen, M. A. Lara-Lopez, S. Maddox, M. J. Michalowski, I. OteoD. Smith, M. W. L. Smith, E. Valiante, P. van der Werf, S. Viaene, Y. Q. Xue

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We present the calibration between the dust continuum luminosity and interstellar gas content obtained from the Valparaiso ALMA Line Emission Survey (VALES) sample of 67 main-sequence star-forming galaxies at 0.02 <z <0.35. We use CO(1-0) observations from the Atacama Large Millimetre/submillimetre Array to trace the molecular gas mass, M-H2, and estimate the rest-frame monochromatic luminosity at 850 mu m, L-nu 850, by extrapolating the dust continuum from MAGPHYS modelling of the far-ultraviolet to submillimetre spectral energy distribution sampled by the Galaxy And Mass Assembly survey. Adopting alpha(CO) = 6.5 (K km s(-1) pc(2))(-1), the average ratio of L-nu 850/M-H2 = (6.4 +/- 1.4) x 10(19) erg s(-1) Hz(-1) M-circle dot(-1), in excellent agreement with literature values. We obtain a linear fit of log(10) (M-H2/M-circle dot) = (0.92 +/- 0.02) log(10)(L-nu 850/erg s(-1) Hz(-1)) - (17.31 +/- 0.59). We provide relations between L-nu 850, M-H2 and M-ISM when combining the VALES and literature samples, and adopting a Galactic alpha(CO) value.

Original languageEnglish
Pages (from-to)L103-L107
Number of pages5
JournalMonthly Notices of the Royal Astronomical Society
Issue number1
Publication statusPublished - Jun 2017

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