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The ALMA Spectroscopic Survey in the Hubble Ultra Deep Field: Evolution of the Molecular Gas in CO-selected Galaxies

Aravena, Manuel; Decarli, Roberto; Gónzalez-López, Jorge; Boogaard, Leindert; Walter, Fabian; Carilli, Chris; Popping, Gergö; Weiss, Axel; Assef, Roberto J.; Bacon, Roland; Bauer, Franz Erik; Bertoldi, Frank; Bouwens, Richard; Contini, Thierry; Cortes, Paulo C.; Cox, Pierre; da Cunha, Elisabete; Daddi, Emanuele; Díaz-Santos, Tanio; Elbaz, David; Hodge, Jacqueline; Inami, Hanae; Ivison, Rob; Fèvre, Olivier Le; Magnelli, Benjamin; Oesch, Pascal; Riechers, Dominik; Smail, Ian; Somerville, Rachel S.; Swinbank, A.M.; Uzgil, Bade; van der Werf, Paul; Wagg, Jeff; Wisotzki, Lutz

The ALMA Spectroscopic Survey in the Hubble Ultra Deep Field: Evolution of the Molecular Gas in CO-selected Galaxies Thumbnail


Authors

Manuel Aravena

Roberto Decarli

Jorge Gónzalez-López

Leindert Boogaard

Fabian Walter

Chris Carilli

Gergö Popping

Axel Weiss

Roberto J. Assef

Roland Bacon

Franz Erik Bauer

Frank Bertoldi

Richard Bouwens

Thierry Contini

Paulo C. Cortes

Pierre Cox

Elisabete da Cunha

Emanuele Daddi

Tanio Díaz-Santos

David Elbaz

Jacqueline Hodge

Hanae Inami

Rob Ivison

Olivier Le Fèvre

Benjamin Magnelli

Pascal Oesch

Dominik Riechers

Rachel S. Somerville

A.M. Swinbank

Bade Uzgil

Paul van der Werf

Jeff Wagg

Lutz Wisotzki



Abstract

We analyze the interstellar medium properties of a sample of 16 bright CO line emitting galaxies identified in the ALMA Spectroscopic Survey in the Hubble Ultra Deep Field (ASPECS) Large Program. This CO−selected galaxy sample is complemented by two additional CO line emitters in the UDF that are identified based on their MultiUnit Spectroscopic Explorer (MUSE) optical spectroscopic redshifts. The ASPECS CO−selected galaxies cover a larger range of star formation rates (SFRs) and stellar masses compared to literature CO emitting galaxies at z > 1 for which scaling relations have been established previously. Most of ASPECS CO-selected galaxies follow these established relations in terms of gas depletion timescales and gas fractions as a function of redshift, as well as the SFR–stellar mass relation (“galaxy main sequence”). However, we find that ∼30% of the galaxies (5 out of 16) are offset from the galaxy main sequence at their respective redshift, with ∼12% (2 out of 16) falling below this relationship. Some CO-rich galaxies exhibit low SFRs, and yet show substantial molecular gas reservoirs, yielding long gas depletion timescales. Capitalizing on the well-defined cosmic volume probed by our observations, we measure the contribution of galaxies above, below, and on the galaxy main sequence to the total cosmic molecular gas density at different lookback times. We conclude that main-sequence galaxies are the largest contributors to the molecular gas density at any redshift probed by our observations (z ∼ 1−3). The respective contribution by starburst galaxies above the main sequence decreases from z ∼ 2.5 to z ∼ 1, whereas we find tentative evidence for an increased contribution to the cosmic molecular gas density from the passive galaxies below the main sequence

Citation

Aravena, M., Decarli, R., Gónzalez-López, J., Boogaard, L., Walter, F., Carilli, C., …Wisotzki, L. (2019). The ALMA Spectroscopic Survey in the Hubble Ultra Deep Field: Evolution of the Molecular Gas in CO-selected Galaxies. Astrophysical Journal, 882(2), https://doi.org/10.3847/1538-4357/ab30df

Journal Article Type Article
Acceptance Date Jul 10, 2019
Online Publication Date Sep 11, 2019
Publication Date Sep 11, 2019
Deposit Date Oct 8, 2019
Publicly Available Date Oct 8, 2019
Journal Astrophysical Journal
Print ISSN 0004-637X
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 882
Issue 2
DOI https://doi.org/10.3847/1538-4357/ab30df

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Copyright Statement
© 2019. The American Astronomical Society. All rights reserved.





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