ALMA discovery of a rotating SO/SO$_2$ flow in HH212. A possible MHD disk wind?
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en
Article de revue
Ce document a été publié dans
Astronomy and Astrophysics - A&A. 2017
EDP Sciences
Résumé en anglais
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 ...Lire la suite >
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 $\leq 50\%$.< Réduire
Mots clés en anglais
Astrophysics - Solar and Stellar Astrophysics
Astrophysics - Astrophysics of Galaxies
stars: formation
ISM: jets and outflows
ISM: individual objects: HH212
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