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

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arxiv 1710.01401 v2 pith:5Z4N7RB2 submitted 2017-10-03 astro-ph.SR astro-ph.GA

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

classification astro-ph.SR astro-ph.GA
keywords flowwindalmadiskhh212possiblerotatingslower
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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"$\sim$ 60 au resolution and compared these observations with synthetic DW predictions. We identified, in SO/SO$_2$, a rotating flow that is 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 a moderate lever arm launched out to $\sim$ 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 $\leq$50%.

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