CO luminosity function from Herschel-selected galaxies and the contribution of AGN

Abstract

We derive the 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 $L_{\mathrm{CO}}^{\prime }-L_{\mathrm{IR}}$ conversions for different galaxy classes. Our predicted LFs fit the data so far available at $z\approx 0$ 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 $z\approx 0$, at $z\approx 1$ and $z\approx 2$ the tension between our LFs and SAMs in the faint and bright ends increases. We finally discuss the contribution of luminous AGN ($L_X>10^{44}\mathrm{erg}{\mathrm{s}}^{-1}$) to the bright end of the CO LF concluding that they are too rare to reproduce the actual CO luminosity function at $z\approx 2$.

5 pages, 3 figures, accepted for publication in MNRAS Letters

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