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Journal Articles The Astrophysical Journal Year : 2016

The ALMA Spectroscopic Survey in the Hubble Ultra Deep Field: Molecular Gas Reservoirs in High-redshift Galaxies

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Roberto Decarli
  • Function : Author
Fabian Walter
  • Function : Author
Manuel Aravena
  • Function : Author
Chris Carilli
  • Function : Author
Rychard Bouwens
  • Function : Author
Elisabete da Cunha
  • Function : Author
David Elbaz
  • Function : Author
Dominik Riechers
  • Function : Author
Ian Smail
  • Function : Author
Mark Swinbank
  • Function : Author
Axel Weiss
  • Function : Author
Roland Bacon
  • Function : Author
Franz Bauer
  • Function : Author
Eric F. Bell
  • Function : Author
Frank Bertoldi
  • Function : Author
Scott Chapman
  • Function : Author
Luis Colina
  • Function : Author
Paulo C. Cortes
  • Function : Author
Pierre Cox
  • Function : Author
Jorge Gónzalez-López
  • Function : Author
Hanae Inami
  • Function : Author
Rob Ivison
  • Function : Author
Jacqueline Hodge
  • Function : Author
Alex Karim
  • Function : Author
Benjamin Magnelli
  • Function : Author
Kazuaki Ota
  • Function : Author
Gergö Popping
  • Function : Author
Hans-Walter Rix
  • Function : Author
Mark Sargent
  • Function : Author
Arjen van der Wel
  • Function : Author
Paul van der Werf
  • Function : Author

Abstract

We study the molecular gas properties of high-z galaxies observed in the ALMA Spectroscopic Survey (ASPECS) that targets an ∼1 arcmin2 region in the Hubble Ultra Deep Field (UDF), a blind survey of CO emission (tracing molecular gas) in the 3 and 1 mm bands. Of a total of 1302 galaxies in the field, 56 have spectroscopic redshifts and correspondingly well-defined physical properties. Among these, 11 have infrared luminosities {L}{IR} {10}11 {L}, I.e., a detection in CO emission was expected. Out of these, 7 are detected at various significance in CO, and 4 are undetected in CO emission. In the CO-detected sources, we find CO excitation conditions that are lower than those typically found in starburst/sub-mm galaxy/QSO environments. We use the CO luminosities (including limits for non-detections) to derive molecular gas masses. We discuss our findings in the context of previous molecular gas observations at high redshift (star formation law, gas depletion times, gas fractions): the CO-detected galaxies in the UDF tend to reside on the low-{L}{IR} envelope of the scatter in the {L}{IR}{--}{L}{CO}\prime relation, but exceptions exist. For the CO-detected sources, we find an average depletion time of ∼1 Gyr, with significant scatter. The average molecular-to-stellar mass ratio ({M}{{H}2}/M *) is consistent with earlier measurements of main-sequence galaxies at these redshifts, and again shows large variations among sources. In some cases, we also measure dust continuum emission. On average, the dust-based estimates of the molecular gas are a factor ∼2-5× smaller than those based on CO. When we account for detections as well as non-detections, we find large diversity in the molecular gas properties of the high-redshift galaxies covered by ASPECS.

Dates and versions

insu-03746214 , version 1 (05-08-2022)

Identifiers

Cite

Roberto Decarli, Fabian Walter, Manuel Aravena, Chris Carilli, Rychard Bouwens, et al.. The ALMA Spectroscopic Survey in the Hubble Ultra Deep Field: Molecular Gas Reservoirs in High-redshift Galaxies. The Astrophysical Journal, 2016, 833, ⟨10.3847/1538-4357/833/1/70⟩. ⟨insu-03746214⟩
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