ALMA Spectroscopic Survey in the Hubble Ultra Deep Field: CO Luminosity Functions and the Evolution of the Cosmic Density of Molecular Gas - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue The Astrophysical Journal Année : 2016

ALMA Spectroscopic Survey in the Hubble Ultra Deep Field: CO Luminosity Functions and the Evolution of the Cosmic Density of Molecular Gas

Roberto Decarli
Fabian Walter
Manuel Aravena
Chris Carilli
Rychard Bouwens
Elisabete da Cunha
Emanuele Daddi
R. J. Ivison
  • Fonction : Auteur
Gergö Popping
Dominik Riechers
Ian R. Smail
  • Fonction : Auteur
Mark Swinbank
  • Fonction : Auteur
Axel Weiss
Timo Anguita
  • Fonction : Auteur
Roberto J. Assef
  • Fonction : Auteur
Franz E. Bauer
  • Fonction : Auteur
Eric F. Bell
  • Fonction : Auteur
Frank Bertoldi
Scott Chapman
  • Fonction : Auteur
Luis Colina
  • Fonction : Auteur
Paulo C. Cortes
  • Fonction : Auteur
Pierre Cox
  • Fonction : Auteur
Mark Dickinson
David Elbaz
  • Fonction : Auteur
Jorge Gónzalez-López
Edo Ibar
  • Fonction : Auteur
Leopoldo Infante
  • Fonction : Auteur
Jacqueline Hodge
Alex Karim
  • Fonction : Auteur
Benjamin Magnelli
Roberto Neri
Pascal Oesch
Kazuaki Ota
  • Fonction : Auteur
Hans-Walter Rix
Mark Sargent
Kartik Sheth
Arjen van Der Wel
  • Fonction : Auteur
Paul van Der Werf
Jeff Wagg
  • Fonction : Auteur

Résumé

In this paper we use ASPECS, the ALMA Spectroscopic Survey in the Hubble Ultra Deep Field in band 3 and band 6, to place blind constraints on the CO luminosity function and the evolution of the cosmic molecular gas density as a function of redshift up to z ∼ 4.5. This study is based on galaxies that have been selected solely through their CO emission and not through any other property. In all of the redshift bins the ASPECS measurements reach the predicted “knee” of the CO luminosity function (around 5 × 109 K km s-1 pc2). We find clear evidence of an evolution in the CO luminosity function with respect to z ∼ 0, with more CO-luminous galaxies present at z ∼ 2. The observed galaxies at z ∼ 2 also appear more gas-rich than predicted by recent semi-analytical models. The comoving cosmic molecular gas density within galaxies as a function of redshift shows a drop by a factor of 3-10 from z ∼ 2 to z ∼ 0 (with significant error bars), and possibly a decline at z > 3. This trend is similar to the observed evolution of the cosmic star formation rate density. The latter therefore appears to be at least partly driven by the increased availability of molecular gas reservoirs at the peak of cosmic star formation (z ∼ 2).

Dates et versions

insu-03667689 , version 1 (13-05-2022)

Identifiants

Citer

Roberto Decarli, Fabian Walter, Manuel Aravena, Chris Carilli, Rychard Bouwens, et al.. ALMA Spectroscopic Survey in the Hubble Ultra Deep Field: CO Luminosity Functions and the Evolution of the Cosmic Density of Molecular Gas. The Astrophysical Journal, 2016, 833, ⟨10.3847/1538-4357/833/1/69⟩. ⟨insu-03667689⟩
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