Roberto Decarli
The ALMA Spectroscopic Survey in the Hubble Ultra Deep Field: Multiband Constraints on Line-luminosity Functions and the Cosmic Density of Molecular Gas
Decarli, Roberto; Aravena, Manuel; Boogaard, Leindert; Carilli, Chris; González-López, Jorge; Walter, Fabian; Cortes, Paulo C.; Cox, Pierre; Cunha, Elisabete da; Daddi, Emanuele; Díaz-Santos, Tanio; Hodge, Jacqueline A.; Inami, Hanae; Neeleman, Marcel; Novak, Mladen; Oesch, Pascal; Popping, Gergö; Riechers, Dominik; Smail, Ian; Uzgil, Bade; Werf, Paul van der; Wagg, Jeff; Weiss, Axel
Authors
Manuel Aravena
Leindert Boogaard
Chris Carilli
Jorge González-López
Fabian Walter
Paulo C. Cortes
Pierre Cox
Elisabete da Cunha
Emanuele Daddi
Tanio Díaz-Santos
Jacqueline A. Hodge
Hanae Inami
Marcel Neeleman
Mladen Novak
Pascal Oesch
Gergö Popping
Dominik Riechers
Ian Smail ian.smail@durham.ac.uk
Emeritus Professor
Bade Uzgil
Paul van der Werf
Jeff Wagg
Axel Weiss
Abstract
We present a CO and atomic fine-structure line-luminosity function analysis using the ALMA Spectroscopic Survey (ASPECS) in the Hubble Ultra Deep Field. ASPECS consists of two spatially overlapping mosaics that cover the entire ALMA 3 mm and 1.2 mm bands. We combine the results of a line-candidate search of the 1.2 mm data cube with those previously obtained from the 3 mm cube. Our analysis shows that ~80% of the line flux observed at 3 mm arises from CO(2–1) or CO(3–2) emitters at z = 1–3 ("cosmic noon"). At 1.2 mm, more than half of the line flux arises from intermediate-J CO transitions (J up = 3–6); ~12% from neutral carbon lines; and <1% from singly ionized carbon, [C ii]. This implies that future [C ii] intensity mapping surveys in the epoch of reionization will need to account for a highly significant CO foreground. The CO luminosity functions probed at 1.2 mm show a decrease in the number density at a given line luminosity (in units of L') at increasing J up and redshift. Comparisons between the CO luminosity functions for different CO transitions at a fixed redshift reveal subthermal conditions on average in galaxies up to z ~ 4. In addition, the comparison of the CO luminosity functions for the same transition at different redshifts reveals that the evolution is not driven by excitation. The cosmic density of molecular gas in galaxies, ρ H2, shows a redshift evolution with an increase from high redshift up to z ~ 1.5 followed by a factor ~6 drop down to the present day. This is in qualitative agreement with the evolution of the cosmic star formation rate density, suggesting that the molecular gas depletion time is approximately constant with redshift, after averaging over the star-forming galaxy population.
Citation
Decarli, R., Aravena, M., Boogaard, L., Carilli, C., González-López, J., Walter, F., …Weiss, A. (2020). The ALMA Spectroscopic Survey in the Hubble Ultra Deep Field: Multiband Constraints on Line-luminosity Functions and the Cosmic Density of Molecular Gas. Astrophysical Journal, 902(2), Article 110. https://doi.org/10.3847/1538-4357/abaa3b
Journal Article Type | Article |
---|---|
Acceptance Date | Jul 27, 2020 |
Online Publication Date | Oct 19, 2020 |
Publication Date | 2020-10 |
Deposit Date | Nov 5, 2020 |
Publicly Available Date | Nov 5, 2020 |
Journal | Astrophysical Journal |
Print ISSN | 0004-637X |
Publisher | American Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 902 |
Issue | 2 |
Article Number | 110 |
DOI | https://doi.org/10.3847/1538-4357/abaa3b |
Public URL | https://durham-repository.worktribe.com/output/1257759 |
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© 2020. The American Astronomical Society. All rights reserved.
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