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The nature of the extreme kinematics in the extended gas of distant radiogalaxies (z>0.7) is still an open question. With the advent of the 8-10 mtelescope generation and the development of NIR arrays we are in the positionfor the first time to develop a more detailed study by using lines other thanLya and [OII]3727 depending on redshift. In this paper we review the mainsources of uncertainty in the interpretation of the emission line kinematics:the presence of several kinematic components, Lya absorption by neutralgas/dust and the contribution of scattered light to some of the lines. As anexample, several kinematic components can produce apparent, false rotationcurves. We propose methods to solve these uncertainties. We propose to extendthe methods applied to low redshift radio galaxies to investigate the nature ofthe kinematics in distant radio galaxies: by means of the spectraldecomposition of the strong optical emission lines (redshifted into the NIR) wecan isolate the different kinematic components and study the emission lineratios for the individual components. If shocks are responsible for the extremekinematics, we should be able to isolate a kinematic component (the shockedgas) with large FWHM (>900 km/s), low ionization level [OIII]5007/Hb~2-4 andweak HeII4686/Hb<0.07, together with a narrow component (~few hundred km/s)with higher ionization level and strong HeII emission (HeII/Hb~0.5)Comment: 11 pages, 6 Figures, to be published in A&A Supplement Serie

Interpreting the kinematics of the extended gas in distant radiogalaxies from 8-10 m telescope spectra