2013A&A...557A.110S

One of the most thoroughly studied jets from all young stellar objects is the jet of DG Tau, which we imaged in the far-ultraviolet with the Hubble Space Telescope for the first time. These high spatial resolution images were obtained with long-pass filters and allow us to construct images tracing mainly H₂ and CIV emission. We find that the H₂ emission appears as a limb-brightened cone with additional emission close to the jet axis. The length of the rims is about 0.3" or 42AU before their brightness strongly drops, and the opening angle is about 90°. Comparing our far-ultraviolet data with near-infrared data we find that the fluorescent H₂ emission probably traces the outer, cooler part of the disk wind while an origin of the H₂ emission in the surface layers (atmosphere) of the (flared) disk is unlikely. Furthermore, the spatial shape of the H₂ emission shows little variation over six years which suggests that the outer part of the disk wind is rather stable and probably not associated with the formation of individual knots. The CIV image shows that the emission is concentrated towards the jet axis. We find no indications for additional CIV emission at larger distances, which strengthens the association with the X-ray emission observed to originate within the DG Tau jet.