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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

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 (similar or equal to 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 (similar or equal to 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 1.5 x 10(-8) M-circle dot 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 languageEnglish
Pages (from-to)L64-L68
Number of pages5
JournalMonthly Notices of the Royal Astronomical Society
Volume436
Issue number1
DOIs
Publication statusPublished - Nov 2013

Keywords

  • radiation mechanisms: general
  • stars: formation
  • HUBBLE-SPACE-TELESCOPE
  • RADIO-CONTINUUM OBSERVATIONS
  • OBSERVED SPATIAL STRUCTURE
  • YOUNG STARS
  • MASS-LOSS
  • VLA OBSERVATIONS
  • OPTICAL OUTFLOW
  • STELLAR WINDS
  • DISK WIND
  • ACCRETION

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