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The formation of the first virialized structures in overdensities dates backto ~9 Gyr ago, i.e. in the redshift range z ~ 1.4 - 1.6. Some models ofstructure formation predict that the star formation activity in clusters washigh at that epoch, implying large reservoirs of cold molecular gas. Aiming atfinding a trace of this expected high molecular gas content in primevalclusters, we searched for the 12CO(2-1) line emission in the most luminousactive galactic nucleus (AGN) of the cluster around the radio galaxy 7C1756+6520 at z ~ 1.4, one of the farthest spectroscopic confirmed clusters.This AGN, called AGN.1317, is located in the neighbourhood of the central radiogalaxy at a projected distance of ~780 kpc. The IRAM Plateau de BureInterferometer was used to investigate the molecular gas quantity in AGN.1317,observing the 12CO(2-1) emission line. We detect CO emission in an AGNbelonging to a galaxy cluster at z ~ 1.4. We measured a molecular gas mass of1.1 x 10^10 Msun, comparable to that found in submillimeter galaxies. Inoptical images, AGN.1317 does not seem to be part of a galaxy interaction ormerger.We also derived the nearly instantaneous star formation rate (SFR) fromHalpha flux obtaining a SFR ~65 Msun/yr. This suggests that AGN.1317 isactively forming stars and will exhaust its reservoir of cold gas in ~0.2-1.0Gyr.

A gas-rich AGN near the centre of a galaxy cluster at z ~ 1.4