Snapshot of a magnetohydrodynamic disk wind traced with water masers
Date Issued
2024
Author(s)
Abstract
Disk-jet systems are common in astrophysical sources of different nature, from black holes to gaseous giant planets. The disk drives the mass accretion onto a central compact object and the jet ejects material along the disk rotation axis. Magnetohydrodynamic disk winds can provide the link between mass accretion and ejection, which is essential to ensure that the excess angular momentum is removed and accretion can proceed. However, up to now, we have been lacking direct observational proof of disk winds. This work presents a direct view of the velocity field of a disk wind around a forming massive star. Achieving a very high spatial resolution of 0.05 au, our water maser observations trace the velocities of individual streamlines emerging from the disk orbiting the forming star. We find that, at low elevation above the disk midplane, the flow co-rotates with its launch point in the disk, in agreement with magneto-centrifugal acceleration. Beyond the co-rotation point, the flow rises spiraling around the disk rotation axis along a helical magnetic field. We have performed (resistive-radiative-gravito-) magnetohydrodynamic simulations of the formation of a massive star and record the development of a magneto-centrifugally launched jet presenting many properties in agreement with our observations.
Coverage
Cosmic Masers: Proper Motion toward the Next-Generation Large Projects
All editors
Hirota, T. ;Imai, H.; Menten, K.; Ylva Pihlstrom, Y.
Volume
vol. 18, S380
Start page
167
Conferenece
Cosmic Masers: Proper Motion Toward the Next-Generation Large Projects
Conferenece place
Kagoshima, Japan
Conferenece date
20-24 March, 2023
Issn Identifier
1743-9213
Rights
open.access
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