ALMA discovery of a rotating SO/SO2 flow in HH212. A possible MHD disk wind?
Abstract
We wish to constrain the possible contribution of a magnetohydrodynamic disk wind (DW) to the HH212 molecular jet. We mapped the flow base with ALMA Cycle 4 at 0.̋13 ~ 60 au resolution and compared these observations with synthetic DW predictions. We identified, in SO/SO2, a rotating flow that is wider and slower than the axial SiO jet. The broad outflow cavity seen in C34S is not carved by a fast wide-angle wind but by this slower agent. Rotation signatures may be fitted by a DW of a moderate lever arm launched out to ~40 au with SiO tracing dust-free streamlines from 0.05-0.3 au. Such a DW could limit the core-to-star efficiency to ≤50%.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- November 2017
- DOI:
- 10.1051/0004-6361/201731691
- arXiv:
- arXiv:1710.01401
- Bibcode:
- 2017A&A...607L...6T
- Keywords:
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- stars: formation;
- ISM: jets and outflows;
- ISM: individual objects: HH212;
- Astrophysics - Solar and Stellar Astrophysics;
- Astrophysics - Astrophysics of Galaxies
- E-Print:
- Accepted for publication in A&