VALES I: the molecular gas content in star-forming dusty H-ATLAS galaxies up to z = 0.35
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 sam...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Oxford University Press
2017
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| Online Access: | https://eprints.nottingham.ac.uk/45138/ |
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| author | 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. |
| author_facet | 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. |
| author_sort | Villanueva, V. |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | 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. |
| first_indexed | 2025-11-14T19:58:08Z |
| format | Article |
| id | nottingham-45138 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T19:58:08Z |
| publishDate | 2017 |
| publisher | Oxford University Press |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-451382017-10-18T17:30:08Z https://eprints.nottingham.ac.uk/45138/ 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. 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. Oxford University Press 2017-05-31 Article PeerReviewed application/pdf en https://eprints.nottingham.ac.uk/45138/1/temp.pdf 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. and 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). pp. 3775-3805. ISSN 1365-2966 ISM: lines and bands galaxies: high-redshift galaxies: ISM infrared: galaxies submillimetre: galaxies https://academic.oup.com/mnras/article-lookup/doi/10.1093/mnras/stx1338 doi:10.1093/mnras/stx1338 doi:10.1093/mnras/stx1338 |
| spellingShingle | ISM: lines and bands galaxies: high-redshift galaxies: ISM infrared: galaxies submillimetre: galaxies 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. VALES I: the molecular gas content in star-forming dusty H-ATLAS galaxies up to z = 0.35 |
| title | VALES I: the molecular gas content in star-forming dusty H-ATLAS galaxies up to z = 0.35 |
| title_full | VALES I: the molecular gas content in star-forming dusty H-ATLAS galaxies up to z = 0.35 |
| title_fullStr | VALES I: the molecular gas content in star-forming dusty H-ATLAS galaxies up to z = 0.35 |
| title_full_unstemmed | VALES I: the molecular gas content in star-forming dusty H-ATLAS galaxies up to z = 0.35 |
| title_short | VALES I: the molecular gas content in star-forming dusty H-ATLAS galaxies up to z = 0.35 |
| title_sort | vales i: the molecular gas content in star-forming dusty h-atlas galaxies up to z = 0.35 |
| topic | ISM: lines and bands galaxies: high-redshift galaxies: ISM infrared: galaxies submillimetre: galaxies |
| url | https://eprints.nottingham.ac.uk/45138/ https://eprints.nottingham.ac.uk/45138/ https://eprints.nottingham.ac.uk/45138/ |