VALES - III. The calibration between the dust continuum and interstellar gas content of star-forming galaxies
Abstract
We present the calibration between the dust continuum luminosity and interstellar gas content obtained from the Valparaíso 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, MH2, and estimate the rest-frame monochromatic luminosity at 850 μm, L_{ν _{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 αCO = 6.5 (K km s-1 pc2)-1, the average ratio of L_{ν _{850}}/MH2 = (6.4 ± 1.4)× 1019 erg s-1 Hz-1 M_{⊙}^{-1}, in excellent agreement with literature values. We obtain a linear fit of log _{10} ({M}_{H2}/{M_{⊙}}) = (0.92± 0.02) log _{10} (L_{ν _{850}}/{erg s^{-1} Hz^{-1}})-(17.31± 0.59). We provide relations between L_{ν _{850}}, MH2 and MISM when combining the VALES and literature samples, and adopting a Galactic αCO value.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- June 2017
- DOI:
- 10.1093/mnrasl/slx033
- arXiv:
- arXiv:1702.07350
- Bibcode:
- 2017MNRAS.468L.103H
- Keywords:
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- ISM: lines and bands;
- galaxies: ISM;
- submillimetre: galaxies;
- Astrophysics - Astrophysics of Galaxies
- E-Print:
- Accepted for publication in MNRAS. 5 pages, including 2 figures and 1 table