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How efficiently star formation proceeds in galaxies is still an openquestion. Recent studies suggest that AGN can regulate the gas accretion andthus slow down star formation (negative feedback). However, evidence of AGNpositive feedback has also been observed in a few radio galaxies (eg. CentaurusA).  Here we present CO observations of 3C 285 and Minkowski Object (MO), whichare examples of jet-induced star formation. A spot (named 09.6) aligned withthe 3C 285 radio jet, at a projected distance of ~70 kpc from the galaxycentre, shows star formation, detected in optical emission. MO is located alongthe jet of NGC 541 and also shows star formation. To know the distribution ofmolecular gas along the jets is a way to study the physical processes at playin the AGN interaction with the intergalactic medium.  We observed CO lines in 3C 285, NGC 541, 09.6 and MO with the IRAM-30mtelescope. In the central galaxies, the spectra present a double-horn profile,typical of a rotation pattern, from which we are able to estimate the moleculargas density profile of the galaxy. The molecular gas appears to be in a compactreservoir. In addition, no kinematic signature of a molecular outflow isdetected by the 30m-telescope.  Interestingly, 09.6 and MO are not detected in CO. The cold gas mass upperlimits are consistent with a star formation induced by the compression of denseambient material by the jet. The depletion time scales are of the order of andeven smaller than what is found in 3C 285, NGC 541 and local spiral galaxies(10^9 yr). The molecular gas surface density in 09.6 follows aSchmidt-Kennicutt law if the emitting region is very compact, while MO is foundto have a much higher SFE (very short depletion time). Higher sensitivity andspatial resolution are necessary to detect CO in the spots of star formation,and map the emission in these jet-induced star forming regions.

Jet-induced star formation in 3C 285 and Minkowski Object