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Aims. We investigate the different manifestations of AGN feedback in theevolved, powerful radio source 3C293 and their impact on the molecular gas ofits host galaxy, which harbors young star-forming regions and fast outflows ofHI and ionized gas. Methods. We study the distribution and kinematics of themolecular gas of 3C293 using high spatial resolution observations of theCO(1-0) and CO(2-1) lines, and the 3 and 1mm continuum taken with the IRAMPdBI. We mapped the molecular gas of 3C293 and compared it with the dust andstar-formation images of the host. We searched for signatures of outflowmotions in the CO kinematics, and reexamined the evidence of outflowing gas inthe HI spectra. We also derived the star formation rate (SFR) and efficiency(SFE) of the host with all available SFR tracers from the literature, andcompared them with the SFE of young and evolved radio galaxies and normalstar-forming galaxies. Results. The CO(1-0) emission line shows that themolecular gas in 3C293 is distributed along a massive (2.2E10 Msun) warped diskwith diameter of 21 kpc that rotates around the AGN. Our data show that thedust and the star formation are clearly associated with the CO disk. TheCO(2-1) emission is located in the inner 7 kpc (diameter) region around theAGN, coincident with the inner part of the CO(1-0) disk. Both the CO(1-0) andCO(2-1) spectra reveal the presence of an absorber against the central regionsof 3C293 that is associated with the disk. We do not detect any fast (>500km/s) outflow motions in the cold molecular gas. The host of 3C293 shows an SFEconsistent with the Kennicutt-Schmidt law. The apparently low SFE of evolvedradio galaxies may be caused by an underestimation of the SFR and/or anoverestimation of the molecular gas densities in these sources. We find nosignatures of AGN feedback in the molecular gas of 3C293.

Fueling the central engine of radio galaxies. III. Molecular gas and star formation efficiency of 3C 293