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Article Dans Une Revue The Astrophysical Journal Année : 2019

The ALMA Spectroscopic Survey in the HUDF: Nature and Physical Properties of Gas-mass Selected Galaxies Using MUSE Spectroscopy

Leindert Boogaard
Roberto Decarli
Jorge González-López
Paul van Der Werf
Fabian Walter
Rychard Bouwens
Manuel Aravena
Franz Erik Bauer
  • Fonction : Auteur
Jarle Brinchmann
Pierre Cox
Elisabete da Cunha
  • Fonction : Auteur
  • PersonId : 866238
Emanuele Daddi
  • Fonction : Auteur
  • PersonId : 837613
Tanio Díaz-Santos
Jacqueline Hodge
Franz Erik Bauer
Hanae Inami
Rob J. Ivison
  • Fonction : Auteur
  • PersonId : 830834
Michael Maseda
Jorryt Matthee
Gergö Popping
Joop Schaye
Sander Schouws
  • Fonction : Auteur
Ian Smail
Axel Weiss
Lutz Wisotzki
  • Fonction : Auteur
Paulo C Cortes
  • Fonction : Auteur
Hans-Walter Rix
Rachel S Somerville
  • Fonction : Auteur
Mark Swinbank
  • Fonction : Auteur
Jeff Wagg
  • Fonction : Auteur

Résumé

We discuss the nature and physical properties of gas-mass selected galaxies in the ALMA spectroscopic survey (ASPECS) of the Hubble Ultra Deep Field (HUDF). We capitalize on the deep optical integral-field spectroscopy from the Multi Unit Spectroscopic Explorer (MUSE) HUDF Survey and multiwavelength data to uniquely associate all 16 line emitters, detected in the ALMA data without preselection, with rotational transitions of carbon monoxide (CO). We identify 10 as CO(2-1) at 1<z<2, 5 as CO(3-2) at 2<z<3, and 1 as CO(4-3) at z=3.6. Using the MUSE data as a prior, we identify two additional CO(2-1) emitters, increasing the total sample size to 18. We infer metallicities consistent with (super-)solar for the CO-detected galaxies at z1.5, motivating our choice of a Galactic conversion factor between CO luminosity and molecular gas mass for these galaxies. Using deep Chandra imaging of the HUDF, we determine an X-ray AGN fraction of 20% and 60% among the CO emitters at z∼1.4 and z∼2.6, respectively. Being a CO-flux-limited survey, ASPECS-LP detects molecular gas in galaxies on, above, and below the main sequence (MS) at z∼1.4. For stellar masses 10 10 (10 10.5) M  , we detect about 40% (50%) of all galaxies in the HUDF at 1<z<2 (2<z<3). The combination of ALMA and MUSE integral-field spectroscopy thus enables an unprecedented view of MS galaxies during the peak of galaxy formation.
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Dates et versions

hal-02325031 , version 1 (22-10-2019)

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Leindert Boogaard, Roberto Decarli, Jorge González-López, Paul van Der Werf, Fabian Walter, et al.. The ALMA Spectroscopic Survey in the HUDF: Nature and Physical Properties of Gas-mass Selected Galaxies Using MUSE Spectroscopy. The Astrophysical Journal, 2019, 882 (2), pp.140. ⟨10.3847/1538-4357/ab3102⟩. ⟨hal-02325031⟩
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