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To investigate the impact of radio jets during the formation epoch of theirmassive host galaxies, we present an analysis of two massive, log(M_stel/M_sun)~10.6 and 11.3, compact radio galaxies at z=3.5, TNJ0205+2242 andTNJ0121+1320. Their small radio sizes (R<= 10 kpc) are most likely a sign ofyouth. We compare their radio properties and gas dynamics with those in wellextended radio galaxies at high redshift, which show strong evidence forpowerful, jet-driven outflows of significant gas masses (M 10^9-10 M_sun). Ouranalysis combines rest-frame optical integral-field spectroscopy with existingradio imaging, CO emission line spectra, and rest-frame UV spectroscopy.[OIII]5007 line emission is compact in both galaxies and lies within the regiondefined by the radio lobes. For TNJ0205+2242, the Ly-alpha profile narrowssignificantly outside the jet radius, indicating the presence of a quiescenthalo. TNJ0121+1320 has two components separated by ~10 kpc and a velocityoffset of ~300 km s^-1. If motions are gravitational, this implies a dynamicalmass of 2x10^11 M_sun for the more massive, radio-loud component. The dynamicalmass, molecular gas mass measured from the CO line emission, and radioluminosity of these two compact radio galaxies imply that compact radio sourcesmay well develop large-scale, energetic outflows as observed in extended radiogalaxies, with the potential of removing significant fractions of the ISM fromthe host galaxy. The absence of luminous emission line gas extending beyond theradio emission in these sources agrees with the observed timescales and outflowrates in extended radio galaxies, and adds further evidence that the energetic,large-scale outflows observed in extended radio sources (Nesvadba et al. 2006)are indeed the result of influence of the radio jet.

Compact radio sources and jet-driven AGN feedback in the early Universe: Constraints from integral-field spectroscopy