Evolution of the dust emission of massive galaxies up to z = 4 and constraints on their dominant mode of star formation - Archive ouverte HAL Access content directly
Journal Articles Astronomy and Astrophysics - A&A Year : 2015

Evolution of the dust emission of massive galaxies up to z = 4 and constraints on their dominant mode of star formation

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Emanuele Daddi
  • Function : Author
  • PersonId : 837613
Georgios Magdis
Claudia Lagos
Mark Sargent
Marcus Albrecht
  • Function : Author
Hervé Aussel
Frank Bertoldi
Sébastien Heinis
  • Function : Author
Alexander Karim
  • Function : Author
Anton Koekemoer
Cedric Lacey
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Felipe Navarrete
  • Function : Author
Vernesa Smolčić
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Myrto Symeonidis
  • Function : Author
Marco Viero
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Abstract

We aim to measure the average dust and molecular gas content of massive star-forming galaxies (>3 × 1010M⊙) up to z = 4 in the COSMOS field to determine if the intense star formation observed at high redshift is induced by major mergers or is caused by large gas reservoirs. Firstly, we measured the evolution of the average spectral energy distributions as a function of redshift using a stacking analysis of Spitzer, Herschel, LABOCA, and AzTEC data for two samples of galaxies: normal star-forming objects and strong starbursts, as defined by their distance to the main sequence. We found that the mean intensity of the radiation field ⟨ U ⟩ heating the dust (strongly correlated with dust temperature) increases with increasing redshift up to z = 4 in main-sequence galaxies. We can reproduce this evolution with simple models that account for the decrease in the gas metallicity with redshift. No evolution of ⟨ U ⟩ with redshift is found in strong starbursts. We then deduced the evolution of the molecular gas fraction (defined here as Mmol/ (Mmol + M⋆)) with redshift and found a similar, steeply increasing trend for both samples. At z ~ 4, this fraction reaches ~60%. The average position of the main-sequence galaxies is on the locus of the local, normal star-forming disks in the integrated Schmidt-Kennicutt diagram (star formation rate versus mass of molecular gas), suggesting that the bulk of the star formation up to z = 4 is dominated by secular processes.
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Dates and versions

cea-01290084 , version 1 (17-03-2016)

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Matthieu Béthermin, Emanuele Daddi, Georgios Magdis, Claudia Lagos, Mark Sargent, et al.. Evolution of the dust emission of massive galaxies up to z = 4 and constraints on their dominant mode of star formation. Astronomy and Astrophysics - A&A, 2015, 573, pp.A113. ⟨10.1051/0004-6361/201425031⟩. ⟨cea-01290084⟩
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