ALMA Spectroscopic Survey in the Hubble Ultra Deep Field : CO luminosity functions and the evolution of the cosmic density of molecular gas

Autor: Roberto J. Assef, Emanuele Daddi, Gergö Popping, Jacqueline Hodge, Kartik Sheth, Paulo C. Cortes, Dominik Riechers, Edo Ibar, Mark Dickinson, Leopoldo Infante, Hans-Walter Rix, Roberto Decarli, Pascal Oesch, Roberto Neri, Arjen van der Wel, David Elbaz, Luis Colina, Jorge González-López, Scott Chapman, Benjamin Magnelli, Alex Karim, Ian Smail, Rychard Bouwens, Axel Weiss, Jeff Wagg, Olivier Le Fevre, Mark Sargent, Paul van der Werf, Timo Anguita, Manuel Aravena, Pierre Cox, Fabian Walter, Elisabete da Cunha, Rob Ivison, Kazuaki Ota, Mark Swinbank, Franz E. Bauer, Frank Bertoldi, Chris Carilli, Eric F. Bell
Přispěvatelé: Laboratoire d'Astrophysique de Marseille (LAM), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)
Rok vydání: 2016
Předmět:
Zdroj: Astrophysical journal, 2016, Vol.833(1), pp.69 [Peer Reviewed Journal]
ASTROPHYSICAL JOURNAL, 833, 69
Decarli, R, Walter, F, Aravena, M, Carilli, C, Bouwens, R, Da Cunha, E, Daddi, E, Ivison, R J, Popping, G, Riechers, D, Smail, I R, Swinbank, M, Weiss, A, Anguita, T, Assef, R J, Bauer, F E, Bell, E F, Bertoldi, F, Chapman, S, Colina, L, Cortes, P C, Cox, P, Dickinson, M, Elbaz, D, G�nzalez-L�pez, J, Ibar, E, Infante, L, Hodge, J, Karim, A, Fevre, O L, Magnelli, B, Neri, R, Oesch, P, Ota, K, Rix, H W, Sargent, M, Sheth, K, Van Der Wel, A, Van Der Werf, P & Wagg, J 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, vol. 833, no. 1, 69 . https://doi.org/10.3847/1538-4357/833/1/69
The Astrophysical Journal
The Astrophysical Journal, 2016, 833, ⟨10.3847/1538-4357/833/1/69⟩
ISSN: 0004-637X
1538-4357
Popis: In this paper we use ASPECS, the ALMA Spectroscopic Survey in the {\em Hubble} Ultra Deep Field (UDF) 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 $z\sim 4.5$. This study is based on galaxies that have been solely selected 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 $5\times10^{9}$ K km/s pc$^2$). We find clear evidence of an evolution in the CO luminosity function with respect to $z\sim 0$, with more CO luminous galaxies present at $z\sim 2$. The observed galaxies at $z\sim 2$ 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 factor 3-10 drop from $z \sim 2$ to $z \sim 0$ (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 ($z\sim2$).
Accepted for publication in the Astrophysical Journal
Databáze: OpenAIRE
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