Vallini, L.L.ValliniGRUPPIONI, CarlottaCarlottaGRUPPIONIPozzi, F.F.PozziVignali, C.C.VignaliZamorani, G.G.Zamorani2023-01-162023-01-1620161745-3925http://hdl.handle.net/20.500.12386/32865We derive the carbon monoxide (CO) luminosity function (LF) for different rotational transitions [I.e. (1-0), (3-2), (5-4)] starting from the Herschel LF by Gruppioni et al. and using appropriate L<SUB>CO</SUB>-L<SUB>IR</SUB> conversions for different galaxy classes. Our predicted LFs fit the data so far available at z ≈ 0 and 2. We compare our results with those obtained by semi-analytical models (SAMs): while we find a good agreement over the whole range of luminosities at z ≈ 0, at z ≈ 1 and z ≈ 2, the tension between our LFs and SAMs in the faint and bright ends increases. We finally discuss the contribution of luminous active galactic nucleus (L<SUB>X</SUB> > 10<SUP>44</SUP> erg s<SUP>- 1</SUP>) to the bright end of the CO LF concluding that they are too rare to reproduce the actual CO LF at z ≈ 2.STAMPAenArticle10.1093/mnrasl/slv173000368010000009https://academic.oup.com/mnrasl/article/456/1/L40/25895972016MNRAS.456L..40VFIS/05 - ASTRONOMIA E ASTROFISICA