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We present the results from the study of the resolved distribution of coldmolecular gas around eight young (<10^6 yr), peaked-spectrum radio galaxies.This has allowed us to trace the interplay between the radio jets and thesurrounding medium. For three of these sources we present new CO(1-0)observations, obtained with NOEMA. In two targets, we also detected CN lines,both in emission and absorption. Combining the new observations with alreadypublished data, we discuss the main results obtained. Although we found that alarge fraction of the cold molecular gas is distributed in disc-like rotatingstructures, in most of the sources high turbulence and deviations from purelyquiescent gas (including outflows) were observed in the region co-spatial withthe radio continuum emission. This suggests the presence of an interactionbetween radio plasma and cold molecular gas. We found that newly born and youngradio jets, even those with low power i.e., P_jet<10^45 erg/s), can drivemassive outflows of cold, molecular gas. The outflows are, however, limited tothe sub-kpc regions and likely short lived. On larger scales (a few kpc), weobserved cases where the molecular gas appears to avoid the radio lobes and,instead, wraps around them. The results suggest the presence of an evolutionarysequence, consistent with simulations, where the type of impact of the radioplasma changes as the jet expands, going from a direct jet-cloud interaction onsub-kpc scales to a gentler pushing aside of the gas, increasing its turbulenceand likely limiting its cooling. This effect can be mediated by the cocoon ofshocked gas inflated by the jet-cloud interactions. Building larger samples ofyoung and evolved radio sources for observation at a similar depth and spatialresolution to test this scenario is now needed and may be possible thanks tomore data becoming available in the growing public archives.

Young Radio Sources Expanding in Gas-Rich ISM: Using Cold Molecular Gas to Trace Their Impact