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We report the detection of extended warm ionized gas in two powerfulhigh-redshift radio galaxies, NVSS J210626-314003 at z=2.10 and TXS 2353-003 atz=1.49, that does not appear to be associated with the radio jets. This iscontrary to what would be expected from the alignment effect, a characteristicfeature of distant, powerful radio galaxies at z> 0.6. The gas also has smallervelocity gradients and line widths than most other high-z radio galaxies withsimilar data. Both galaxies are part of a systematic study of 50 high-redshiftradio galaxies with SINFONI, and are the only two that are characterized by thepresence of high surface-brightness gas not associated with the jet axis and bythe absence of such gas aligned with the jet. Both galaxies are spatiallyresolved with ISAAC broadband imaging covering the rest-frame R band, and haveextended wings that cannot be attributed to line contamination. We argue thatthe gas and stellar properties of these galaxies are more akin to gas-richbrightest cluster galaxies in cool-core clusters than the general population ofhigh-redshift radio galaxies at z>2. In support of this interpretation, one ofour sources, TXS 2353-003, for which we have H\alpha\ narrowband imaging, isassociated with an overdensity of candidate H\alpha\ emitters by a factor of 8relative to the field at z=1.5. We discuss possible scenarios of theevolutionary state of these galaxies and the nature of their emission line gaswithin the context of cyclical AGN feedback.

Defying jet-gas alignment in two radio galaxies at z~2 with extended light profiles: Similarities to brightest cluster galaxies