Popping, GergöGergöPoppingvan Kampen, EelcoEelcovan KampenDECARLI, ROBERTOROBERTODECARLISpaans, MarcoMarcoSpaansSomerville, Rachel S.Rachel S.SomervilleTrager, Scott C.Scott C.Trager2020-06-292020-06-2920160035-8711http://hdl.handle.net/20.500.12386/26245Now that Atacama Large (Sub)Millimeter Array is reaching its full capabilities, observations of sub-mm emission line deep fields become feasible. We couple a semi-analytic model of galaxy formation with a radiative transfer code to make predictions for the luminosity function of CO J =1-0 out to CO J = 6-5 and [C II] at redshifts z= 0-6. We find that (1) our model correctly reproduces the CO and [C II] emission of low- and high-redshift galaxies and reproduces the available constraints on the CO luminosity function at z ≤ 2.75; (2) we find that the CO and [C II] luminosity functions of galaxies increase from z = 6 to z = 4, remain relatively constant till z = 1 and rapidly decrease towards z = 0. The galaxies that are brightest in CO and [C II] are found at z ∼ 2; (3) the CO J = 3-2 emission line is most favourable to study the CO luminosity and global H<SUB>2</SUB> mass content of galaxies, because of its brightness and observability with currently available sub-mm and radio instruments; (4) the luminosity functions of high-J CO lines show stronger evolution than the luminosity functions of low-J CO lines; (5) our model barely reproduces the available constraints on the CO and [C II] luminosity function of galaxies at z ≥ 1.5 and the CO luminosity of individual galaxies at intermediate redshifts. We argue that this is driven by a lack of cold gas in galaxies at intermediate redshifts as predicted by cosmological simulations of galaxy formation.STAMPAenArticle10.1093/mnras/stw13232-s2.0-84988905497000383272500009https://academic.oup.com/mnras/article/461/1/93/25952882016MNRAS.461...93PFIS/05 - ASTRONOMIA E ASTROFISICA