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

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. Michalowski & 7 others J. Molina, D. Riechers, A. E. Sansom, M. W. L. Smith, G. Rodighiero, E. Valiante, P. van der Werf

Research output: Contribution to journalArticle

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 Valparaiso ALMA Line Emission Survey (VALES). We use ALMA Band-3 CO(1-0) observations to study themolecular 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 >5 sigma significance and 12 others are seen at low significance in stacked spectra. CO luminosities are in the range of (0.03-1.31) x 10(10) K km s(-1) pc(2), equivalent to log(M-gas/M-circle dot) = 8.9-10.9 assuming an alpha(CO) = 4.6 (K km s(-1) pc(2))(-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 similar to 3.5 arcsec resolution (6.5 kpc), finding that the molecular gas is on average similar to 0.6 times more compact than the stellar component. We obtain a global Schmidt-Kennicutt relation, given by log[Sigma(SFR)/(M(circle dot)yr(-1)kpc(-2))] = (1.26 +/- 0.02) x log[Sigma(MH2)/(M(circle dot)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 L-IR = 10(11-12) L-circle dot. Combining our observations with data taken from the literature, we propose that star formation efficiencies can be parametrized by log [SFR/M-H2] = 0.19 x (log L-IR -11.45) - 8.26 - 0.41 x arctan[-4.84 (lo gL(IR) -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.

LanguageEnglish
Pages3775-3805
Number of pages31
JournalMonthly Notices of the Royal Astronomical Society
Volume470
Issue number4
DOIs
StatePublished - Oct 2017

Cite this

Villanueva, V., Ibar, E., Hughes, T. M., Lara-Lopez, M. A., 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), 3775-3805. DOI: 10.1093/mnras/stx1338
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. ; Michalowski, 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. In: Monthly Notices of the Royal Astronomical Society. 2017 ; Vol. 470, No. 4. pp. 3775-3805
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title = "VALES I: the molecular gas content in star-forming dusty H-ATLAS galaxies up to z=0.35",
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 Valparaiso ALMA Line Emission Survey (VALES). We use ALMA Band-3 CO(1-0) observations to study themolecular 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 >5 sigma significance and 12 others are seen at low significance in stacked spectra. CO luminosities are in the range of (0.03-1.31) x 10(10) K km s(-1) pc(2), equivalent to log(M-gas/M-circle dot) = 8.9-10.9 assuming an alpha(CO) = 4.6 (K km s(-1) pc(2))(-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 similar to 3.5 arcsec resolution (6.5 kpc), finding that the molecular gas is on average similar to 0.6 times more compact than the stellar component. We obtain a global Schmidt-Kennicutt relation, given by log[Sigma(SFR)/(M(circle dot)yr(-1)kpc(-2))] = (1.26 +/- 0.02) x log[Sigma(MH2)/(M(circle dot)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 L-IR = 10(11-12) L-circle dot. Combining our observations with data taken from the literature, we propose that star formation efficiencies can be parametrized by log [SFR/M-H2] = 0.19 x (log L-IR -11.45) - 8.26 - 0.41 x arctan[-4.84 (lo gL(IR) -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.",
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author = "V. Villanueva and E. Ibar and Hughes, {T. M.} and Lara-Lopez, {M. A.} and L. Dunne and S. Eales and Ivison, {R. J.} and M. Aravena and M. Baes and N. Bourne and P. Cassata and A. Cooray and H. Dannerbauer and Davies, {L. J. M.} and Driver, {S. P.} and S. Dye and C. Furlanetto and R. Herrera-Camus and Maddox, {S. J.} and Michalowski, {M. J.} and J. Molina and D. Riechers and Sansom, {A. E.} and Smith, {M. W. L.} and G. Rodighiero and E. Valiante and {van der Werf}, P.",
year = "2017",
month = "10",
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language = "English",
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pages = "3775--3805",
journal = "Monthly Notices of the Royal Astronomical Society",
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Villanueva, V, Ibar, E, Hughes, TM, Lara-Lopez, MA, Dunne, L, Eales, S, Ivison, RJ, Aravena, M, Baes, M, Bourne, N, Cassata, P, Cooray, A, Dannerbauer, H, Davies, LJM, Driver, SP, Dye, S, Furlanetto, C, Herrera-Camus, R, Maddox, SJ, Michalowski, MJ, Molina, J, Riechers, D, Sansom, AE, Smith, MWL, Rodighiero, G, Valiante, E & 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, vol 470, no. 4, pp. 3775-3805. DOI: 10.1093/mnras/stx1338

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.; Michalowski, M. J.; Molina, J.; Riechers, D.; Sansom, A. E.; Smith, M. W. L.; Rodighiero, G.; Valiante, E.; van der Werf, P.

In: Monthly Notices of the Royal Astronomical Society, Vol. 470, No. 4, 10.2017, p. 3775-3805.

Research output: Contribution to journalArticle

TY - JOUR

T1 - VALES I

T2 - Monthly Notices of the Royal Astronomical Society

AU - Villanueva,V.

AU - Ibar,E.

AU - Hughes,T. M.

AU - Lara-Lopez,M. A.

AU - Dunne,L.

AU - Eales,S.

AU - Ivison,R. J.

AU - Aravena,M.

AU - Baes,M.

AU - Bourne,N.

AU - Cassata,P.

AU - Cooray,A.

AU - Dannerbauer,H.

AU - Davies,L. J. M.

AU - Driver,S. P.

AU - Dye,S.

AU - Furlanetto,C.

AU - Herrera-Camus,R.

AU - Maddox,S. J.

AU - Michalowski,M. J.

AU - Molina,J.

AU - Riechers,D.

AU - Sansom,A. E.

AU - Smith,M. W. L.

AU - Rodighiero,G.

AU - Valiante,E.

AU - van der Werf,P.

PY - 2017/10

Y1 - 2017/10

N2 - 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 Valparaiso ALMA Line Emission Survey (VALES). We use ALMA Band-3 CO(1-0) observations to study themolecular 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 >5 sigma significance and 12 others are seen at low significance in stacked spectra. CO luminosities are in the range of (0.03-1.31) x 10(10) K km s(-1) pc(2), equivalent to log(M-gas/M-circle dot) = 8.9-10.9 assuming an alpha(CO) = 4.6 (K km s(-1) pc(2))(-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 similar to 3.5 arcsec resolution (6.5 kpc), finding that the molecular gas is on average similar to 0.6 times more compact than the stellar component. We obtain a global Schmidt-Kennicutt relation, given by log[Sigma(SFR)/(M(circle dot)yr(-1)kpc(-2))] = (1.26 +/- 0.02) x log[Sigma(MH2)/(M(circle dot)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 L-IR = 10(11-12) L-circle dot. Combining our observations with data taken from the literature, we propose that star formation efficiencies can be parametrized by log [SFR/M-H2] = 0.19 x (log L-IR -11.45) - 8.26 - 0.41 x arctan[-4.84 (lo gL(IR) -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.

AB - 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 Valparaiso ALMA Line Emission Survey (VALES). We use ALMA Band-3 CO(1-0) observations to study themolecular 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 >5 sigma significance and 12 others are seen at low significance in stacked spectra. CO luminosities are in the range of (0.03-1.31) x 10(10) K km s(-1) pc(2), equivalent to log(M-gas/M-circle dot) = 8.9-10.9 assuming an alpha(CO) = 4.6 (K km s(-1) pc(2))(-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 similar to 3.5 arcsec resolution (6.5 kpc), finding that the molecular gas is on average similar to 0.6 times more compact than the stellar component. We obtain a global Schmidt-Kennicutt relation, given by log[Sigma(SFR)/(M(circle dot)yr(-1)kpc(-2))] = (1.26 +/- 0.02) x log[Sigma(MH2)/(M(circle dot)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 L-IR = 10(11-12) L-circle dot. Combining our observations with data taken from the literature, we propose that star formation efficiencies can be parametrized by log [SFR/M-H2] = 0.19 x (log L-IR -11.45) - 8.26 - 0.41 x arctan[-4.84 (lo gL(IR) -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.

KW - ISM: lines and bands

KW - galaxies: high-redshift

KW - galaxies: ISM

KW - infrared: galaxies

KW - submillimetre: galaxies

KW - ULTRALUMINOUS INFRARED GALAXIES

KW - LUMINOUS SUBMILLIMETER GALAXIES

KW - PROBE WMAP OBSERVATIONS

KW - DIGITAL SKY SURVEY

KW - NEARBY GALAXIES

KW - DATA RELEASE

KW - CONVERSION FACTOR

KW - HERSCHEL-ATLAS

KW - MASSIVE GALAXIES

KW - SPIRAL GALAXIES

U2 - 10.1093/mnras/stx1338

DO - 10.1093/mnras/stx1338

M3 - Article

VL - 470

SP - 3775

EP - 3805

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 4

ER -

Villanueva V, Ibar E, Hughes TM, Lara-Lopez MA, Dunne L, Eales S et al. 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. 2017 Oct;470(4):3775-3805. Available from, DOI: 10.1093/mnras/stx1338