Volume 557, September 2013
|Number of page(s)
|Interstellar and circumstellar matter
|11 September 2013
HST far-ultraviolet imaging of DG Tauri
Fluorescent molecular hydrogen emission from the wide opening-angle outflow
Hamburger Sternwarte, Gojenbergsweg 112,
2 Thüringer Landessternwarte Tautenburg, Sternwarte 5, 07778 Tautenburg, Germany
3 University of Vienna, Department of Astrophysics, Türkenschanzstrasse 17, 1180 Vienna, Austria
4 Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA
5 The Kavli Institute for Astronomy and Astrophysics, Peking University, Yi He Yuan Lu 5, Hai Dian Qu, 100871 Beijing, PR China
Received: 25 March 2013
Accepted: 1 July 2013
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 C iv 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 42 AU 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 C iv image shows that the emission is concentrated towards the jet axis. We find no indications for additional C iv emission at larger distances, which strengthens the association with the X-ray emission observed to originate within the DG Tau jet.
Key words: stars: individual: DG Tauri / Herbig-Haro objects / ISM: jets and outflows / stars: variables: T Tauri, Herbig Ae/Be / stars: formation
© ESO, 2013
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