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VALES I: the molecular gas content in star-forming dusty H-ATLAS galaxies up to z = 0.35

Villanueva, V.; Ibar, E.; Hughes, T.M.; Lara-Lopez, 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.; Michałowski, M.J.; Molina, J.; Riechers, D.; Sansom, A.E.; Smith, M.W.L.; Rodighiero, G.; Valiante, E.; van der Werf, P.

Authors

V. Villanueva

E. Ibar

T.M. Hughes

M.A. Lara-Lopez

L. Dunne

S. Eales

R.J. Ivison

M. Aravena

M. Baes

N. Bourne

P. Cassata

A. Cooray

H. Dannerbauer

L.J.M. Davies

S.P. Driver

S. Dye

C. Furlanetto

R. Herrera-Camus

S.J. Maddox

M.J. Michałowski

J. Molina

D. Riechers

A.E. Sansom

M.W.L. Smith

G. Rodighiero

E. Valiante

P. van der Werf



Abstract

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 Valpara´ıso 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−1 kpc−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 longstanding 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 × (log LIR − 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.

Journal Article Type Article
Publication Date May 31, 2017
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Oxford University Press (OUP)
Peer Reviewed Peer Reviewed
Volume 470
Issue 4
APA6 Citation Villanueva, V., Ibar, E., Hughes, T., Lara-Lopez, M., Dunne, L., Eales, S., …van der Werf, P. (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, 470(4), doi:10.1093/mnras/stx1338
DOI https://doi.org/10.1093/mnras/stx1338
Keywords ISM: lines and bands, galaxies: high-redshift, galaxies: ISM, infrared: galaxies, submillimetre: galaxies
Publisher URL https://academic.oup.com/mnras/article-lookup/doi/10.1093/mnras/stx1338
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf
Additional Information This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2017 The authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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