Abstract
We present very high spatial resolution deep radio continuum observations at 5 GHz (6 cm) made with the extended Multi-Element Radio Linked Interferometer Network (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 farther along the jet (≃50 au). We derive jet parameters for DG Tau A and find an initial jet opening angle of 86° within 2 au of the source, a mass-loss rate of 1.5 × 10-8 M⊙ yr-1 for the ionized component of the jet, and the total ejection-to-accretion ratio to range from 0.06 to 0.3. These results are in line with predictions from magnetohydrodynamic jet-launching theories.
Original language | English |
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Pages (from-to) | L64-L68 |
Number of pages | 5 |
Journal | Monthly Notices of the Royal Astronomical Society |
Volume | 436 |
Issue number | 1 |
DOIs | |
Publication status | Published - 21 Nov 2013 |