Sub-arcsecond high sensitivity measurements of the DG~Tau jet with e-MERLIN

Abstract

We present very high spatial resolution deep radio continuum observations at 5 GHz (6 cm) made with e-MERLIN of the young stars DG Tau A and B. Assuming it is launched very close (~=1 au) from the star, our results suggest that the DG Tau A outflow initially starts as a poorly focused wind and undergoes significant collimation further along the jet (~=50 au). We derive jet parameters for DG Tau A and find an initial jet opening angle of 86 degrees within 2 au of the source, a mass-loss rate of 1.5x10^-8 solar masses/yr for the ionised component of the jet, and the total ejection/accretion ratio to range from 0.06-0.3. These results are in line with predictions from MHD jet-launching theories.

Accepted MNRAS Letters

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Cited by in corpus (8)

• Tentative Evidence for Relativistic Electrons Generated by the Jet of the Young Sun-like Star DG Tau
• Multi-epoch Sub-arcsecond [Fe II] Spectroimaging of the DG Tau Outflows with NIFS. I. First data epoch
• Laboratory disruption of scaled astrophysical outflows by a misaligned magnetic field
• Parsec-scale jets driven by high-mass young stellar objects. Connecting the au- and the parsec-scale jet in IRAS 13481-6124
• Constraining the nature of DG Tau A's thermal and non-thermal radio emission
• GMRT detections of low mass young stars at 323 and 608 MHz
• Resolving the collimation zone of an intermediate-mass protostar
• A GMRT survey of regions towards the Taurus Molecular Cloud at 323 and 608 MHz