VALES I : the molecular gas content in star-forming dusty H-ATLAS galaxies up to z=0.35
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We present an extragalactic survey using observations from the Atacama Large Millimeter/submillimeter Array (ALMA) to characterize galaxy populations up to z = 0.35: the Valparaíso ALMA Line Emission Survey (VALES). We use ALMA Band-3 CO(1–0) observations to study the molecular gas content in a sample of 67 dusty normal star-forming galaxies selected from the Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS). We have spectrally detected 49 galaxies at >5σ significance and 12 others are seen at low significance in stacked spectra. CO luminosities are in the range of (0.03–1.31) × 1010 K km s−1 pc2, equivalent to log(Mgas/M⊙)=8.9--10.9 assuming an αCO = 4.6 (K km s−1 pc2)−1, which perfectly complements the parameter space previously explored with local and high-z normal galaxies. We compute the optical to CO size ratio for 21 galaxies resolved by ALMA at ∼3.5 arcsec resolution (6.5 kpc), finding that the molecular gas is on average ∼ 0.6 times more compact than the stellar component. We obtain a global Schmidt–Kennicutt relation, given by log[ΣSFR/(M⊙yr−1kpc−2)]=(1.26±0.02)×log[ΣMH2/(M⊙pc−2)]−(3.6±0.2). We find a significant fraction of galaxies lying at ‘intermediate efficiencies’ between a long-standing mode of star formation activity and a starburst, specially at LIR = 1011–12 L⊙. Combining our observations with data taken from the literature, we propose that star formation efficiencies can be parametrized by log[SFR/MH2]=0.19×(logLIR−11.45)−8.26−0.41 × arctan[−4.84(logLIR−11.45)]. Within the redshift range we explore (z < 0.35), we identify a rapid increase of the gas content as a function of redshift.
Villanueva , V , Ibar , E , Hughes , T M , Lara-López , M A , Dunne , L , Eales , S , Ivison , R J , Aravena , M , Baes , M , Bourne , N , Cassata , P , Cooray , A , Dannerbauer , H , Davies , L J M , Driver , S P , Dye , S , Furlanetto , C , Herrera-Camus , R , Maddox , S J , Michalowski , M J , Molina , J , Riechers , D , Sansom , A E , Smith , M W L , Rodighiero , G , Valiante , E & Werf , P V D 2017 , ' VALES I : the molecular gas content in star-forming dusty H -ATLAS galaxies up to z=0.35 ' Monthly Notices of the Royal Astronomical Society , vol. 470 , no. 4 , pp. 3775-3805 . DOI: 10.1093/mnras/stx1338
Monthly Notices of the Royal Astronomical Society
© 2017, the Author(s). This work has been made available online in accordance with the publisher’s policies. This is the final published version of the work, which was originally published at https://doi.org/10.1093/mnras/stx1338
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