Subarcsecond high-sensitivity measurements of the DG tau jet with e-MERLIN

Rachael E. Ainsworth; Tom P. Ray; Anna M M Scaife; Jane S. Greaves; Rob J. Beswick

doi:10.1093/mnrasl/slt114

Subarcsecond high-sensitivity measurements of the DG tau jet with e-MERLIN

Rachael E. Ainsworth, Tom P. Ray, Anna M M Scaife, Jane S. Greaves, Rob J. Beswick

Research output: Contribution to journal › Article › peer-review

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
Pages (from-to)	L64-L68
Number of pages	5
Journal	Monthly Notices of the Royal Astronomical Society
Volume	436
Issue number	1
DOIs	https://doi.org/10.1093/mnrasl/slt114 https://doi.org/10.1093/mnrasl/slt114
Publication status	Published - 21 Nov 2013

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title = "Subarcsecond 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 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.",

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T1 - Subarcsecond high-sensitivity measurements of the DG tau jet with e-MERLIN

AU - Ainsworth, Rachael E.

AU - Ray, Tom P.

AU - Scaife, Anna M M

AU - Greaves, Jane S.

AU - Beswick, Rob J.

PY - 2013/11/21

Y1 - 2013/11/21

N2 - 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.

AB - 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.

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DO - 10.1093/mnrasl/slt114

M3 - Article

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JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

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ER -

Subarcsecond high-sensitivity measurements of the DG tau jet with e-MERLIN

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