ALMA discovery of a rotating SO/SO$_2$ flow in HH212. A possible MHD disk wind?
Language
en
Article de revue
This item was published in
Astronomy and Astrophysics - A&A. 2017
EDP Sciences
English Abstract
We wish to put tight constraints on the possible contribution of an MHD disk wind (DW) to the HH212 molecular jet. We use ALMA Cycle 4 to map the inner outflow at $0.13" \sim$ 60~au resolution, and compare with synthetic ...Read more >
We wish to put tight constraints on the possible contribution of an MHD disk wind (DW) to the HH212 molecular jet. We use ALMA Cycle 4 to map the inner outflow at $0.13" \sim$ 60~au resolution, and compare with synthetic predictions for DW models. We identify in SO/SO$_2$ a rotating flow wider and slower than the axial SiO jet. The broad outflow cavity seen in C$^{34}$S is not carved by a fast wide-angle wind but by this slower agent. Rotation signatures may be fitted by a DW of moderate lever arm launched out to $\sim$ 40 au, with SiO tracing dust-free streamlines from 0.05-0.3 au. If indeed a DW, it could limit the core-to-star efficiency to $\leq 50\%$.Read less <
English Keywords
Astrophysics - Solar and Stellar Astrophysics
Astrophysics - Astrophysics of Galaxies
stars: formation
ISM: jets and outflows
ISM: individual objects: HH212
Origin
Hal imported