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Low Medium High Very High velocity velocity velocity velocity

Low Medium High Very High velocity velocity velocity velocity b Observed Radial Velocity Shift DISK

Velocity (km/s)

Fig. 9. (a) Channel maps in different velocity intervals of the jet from DG Tauri, in various emission lines, and at sub-arcsecond resolution. These images, reconstructed from HST/STIS spectra, reveal the onion-skin structure of the jet at its base, in agreement with the indications of magneto-hydrodynamic models. The numbers superimposing the [SII] image indicate the derived values of the electron density (figure taken from [3]); (b) Map of the velocity differences across the jet from DG Tauri derived from HST/STIS spectra. The velocity shift at the jet borders can be interpreted as rotation of the flow around its symmetry axis (adapted from [5])

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