%0 Generic %1 decarli2016spectroscopic %A Decarli, Roberto %A Walter, Fabian %A Aravena, Manuel %A Carilli, Chris %A Bouwens, Rychard %A da Cunha, Elisabete %A Daddi, Emanuele %A Ivison, R. J. %A Popping, Gergö %A Riechers, Dominik %A Smail, Ian %A Swinbank, Mark %A Weiss, Axel %A Anguita, Timo %A Assef, Roberto %A Bauer, Franz %A Bell, Eric F. %A Bertoldi, Frank %A Chapman, Scott %A Colina, Luis %A Cortes, Paulo C. %A Cox, Pierre %A Dickinson, Mark %A Elbaz, David %A Gónzalez-López, Jorge %A Ibar, Edo %A Infante, Leopoldo %A Hodge, Jacqueline %A Karim, Alex %A Fevre, Olivier Le %A Magnelli, Benjamin %A Neri, Roberto %A Oesch, Pascal %A Ota, Kazuaki %A Rix, Hans-Walter %A Sargent, Mark %A Sheth, Kartik %A van der Wel, Arjen %A van der Werf, Paul %A Wagg, Jeff %D 2016 %K co evolution function hudf luminosity redshift %T ALMA spectroscopic survey in the Hubble Ultra Deep Field: CO luminosity functions and the evolution of the cosmic density of molecular gas %U http://arxiv.org/abs/1607.06770 %X 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 $z4.5$. 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 $z0$, with more CO luminous galaxies present at $z2$. The observed galaxies at $z2$ 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 $z 2$ 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 ($z\sim2$).

@misc{decarli2016spectroscopic, abstract = {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 ($z\sim2$).}, added-at = {2016-07-25T10:22:09.000+0200}, author = {Decarli, Roberto and Walter, Fabian and Aravena, Manuel and Carilli, Chris and Bouwens, Rychard and da Cunha, Elisabete and Daddi, Emanuele and Ivison, R. J. and Popping, Gergö and Riechers, Dominik and Smail, Ian and Swinbank, Mark and Weiss, Axel and Anguita, Timo and Assef, Roberto and Bauer, Franz and Bell, Eric F. and Bertoldi, Frank and Chapman, Scott and Colina, Luis and Cortes, Paulo C. and Cox, Pierre and Dickinson, Mark and Elbaz, David and Gónzalez-López, Jorge and Ibar, Edo and Infante, Leopoldo and Hodge, Jacqueline and Karim, Alex and Fevre, Olivier Le and Magnelli, Benjamin and Neri, Roberto and Oesch, Pascal and Ota, Kazuaki and Rix, Hans-Walter and Sargent, Mark and Sheth, Kartik and van der Wel, Arjen and van der Werf, Paul and Wagg, Jeff}, biburl = {https://www.bibsonomy.org/bibtex/23ce4f3d62bfff22ab1f8d6ca57856efa/miki}, description = {[1607.06770] ALMA spectroscopic survey in the Hubble Ultra Deep Field: CO luminosity functions and the evolution of the cosmic density of molecular gas}, interhash = {514e24c2414d16c21058b12f98e3f94f}, intrahash = {3ce4f3d62bfff22ab1f8d6ca57856efa}, keywords = {co evolution function hudf luminosity redshift}, note = {cite arxiv:1607.06770Comment: Submitted to the Astrophysical Journal, incorporating the first round of referee comments}, timestamp = {2016-07-25T10:22:09.000+0200}, title = {ALMA spectroscopic survey in the Hubble Ultra Deep Field: CO luminosity functions and the evolution of the cosmic density of molecular gas}, url = {http://arxiv.org/abs/1607.06770}, year = 2016 }