ALMA discovery of a rotating SO/SO2 flow in HH212 A possible MHD disk wind?

作者：Tabone B^*; Cabrit S; Bianchi E; Ferreira J; des Forets G Pineau; Codella C; Gusdorf A; Gueth F; Podio L; Chapillon E

来源：Astronomy & Astrophysics, 2017, 607: L6.

DOI：10.1051/0004-6361/201731691

• stars: formation
• ISM: jets and outflows
• ISM: individual objects: HH212

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 similar to 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 (CS)-S-34 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 similar 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%.

• 出版日期2017-11-15