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

Decarli, Roberto and Walter, Fabian (2016) ALMA Spectroscopic Survey in the Hubble Ultra Deep Field: CO Luminosity Functions and the Evolution of the Cosmic Density of Molecular Gas. Astrophysical Journal, 833 (1). Art. No. 69. ISSN 0004-637X. http://resolver.caltech.edu/CaltechAUTHORS:20161213-074338157

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Abstract

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 × 10^9 K km s^(−1) pc^2). 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).


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.3847/1538-4357/833/1/69DOIArticle
http://iopscience.iop.org/article/10.3847/1538-4357/833/1/69PublisherArticle
https://arxiv.org/abs/1607.06770arXivDiscussion Paper
ORCID:
AuthorORCID
Walter, Fabian0000-0003-4793-7880
Additional Information:© 2016 American Astronomical Society. Received 2016 May 3; revised 2016 September 5; accepted 2016 September 7; published 2016 December 8. We thank the anonymous referee for excellent feedback that improved the quality of the paper. F.W., I.R.S., and R.J.I. acknowledge support through ERC grants COSMIC-DAWN, DUSTYGAL, and COSMICISM, respectively. M.A. acknowledges partial support from FONDECYT through grant 1140099. D.R. acknowledges support from the National Science Foundation under grant number AST-1614213 to Cornell University. F.E.B. and L.I. acknowledge Conicyt grants Basal-CATA PFB-06/2007 and Anilo ACT1417. F.E.B. also acknowledges support from FONDECYT Regular 1141218 (FEB), and the Ministry of Economy, Development, and Tourism's Millennium Science Initiative through grant IC120009, awarded to The Millennium Institute of Astrophysics, MAS. I.R.S. also acknowledges support from STFC (ST/L00075X/1) and a Royal Society/Wolfson Merit award. Support for R.D. and B.M. was provided by the DFG priority program 1573 "The physics of the interstellar medium." A.K. and F.B. acknowledge support by the Collaborative Research Council 956, sub-project A1, funded by the Deutsche Forschungsgemeinschaft (DFG). L.I. acknowledges Conicyt grants Basal-CATA PFB-06/2007 and Anilo ACT1417. R.J.A. was supported by FONDECYT grant number 1151408. This paper makes use of the following ALMA data: [ADS/JAO.ALMA# 2013.1.00146.S and 2013.1.00718.S.]. ALMA is a partnership of ESO (representing its member states), NSF (USA), and NINS (Japan), together with NRC (Canada), NSC and ASIAA (Taiwan), and KASI (Republic of Korea), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/NRAO, and NAOJ. The 3 mm part of the ASPECS project had been supported by the German ARC.
Funders:
Funding AgencyGrant Number
European Research Council (ERC)COSMIC-DAWN
European Research Council (ERC)DUSTYGAL
European Research Council (ERC)COSMICISM
Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)1140099
NSFAST-1614213
Basal-CATAPFB-06/2007
Comisión Nacional de Investigación Científica y Tecnológica (CONICYT)Anilo ACT1417
Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)1141218
Iniciativa Científica Milenio del Ministerio de Economía, Fomento y TurismoIC120009
Science and Technology Facilities Council (STFC)ST/L00075X/1
Royal SocietyUNSPECIFIED
Deutsche Forschungsgemeinschaft (DFG)1573
Collaborative Research Council 956UNSPECIFIED
Deutsche Forschungsgemeinschaft (DFG)UNSPECIFIED
Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)1151408
Argelander-Institut für AstronomieUNSPECIFIED
Subject Keywords:galaxies: evolution; galaxies: formation; galaxies: high-redshift; galaxies: ISM; surveys
Record Number:CaltechAUTHORS:20161213-074338157
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20161213-074338157
Official Citation:Roberto Decarli et al 2016 ApJ 833 69
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:72755
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:13 Dec 2016 17:20
Last Modified:20 Aug 2017 05:41

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