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Unveiling a magnetized jet from a low-mass protostar
Chin-Fei Lee1,2, Hsiang-Chih Hwang3,4, Tao-Chung Ching5
1Academia Sinica Institute of Astronomy and Astrophysics, P.O. Box 23-141, Taipei, 106, Taiwan. cflee@asiaa.sinica.edu.tw.
Nature Communications
|November 8, 2018
Summary
We detected magnetic fields in protostellar jets using SiO line polarization. This confirms magnetic fields are crucial for launching and collimating jets from young stars, supporting current star formation models.
Area of Science:
- Astronomy
- Astrophysics
- Star Formation
Background:
- Protostellar jets are key indicators of star formation.
- Jet rotation suggests angular momentum removal from accretion disks.
- Magnetic fields are theoretically essential for jet launching and collimation, but observational evidence is lacking.
Purpose of the Study:
- To provide observational evidence for magnetic fields in protostellar jets.
- To investigate the role of magnetic fields in jet collimation.
Main Methods:
- Observation of the HH 211 protostellar jet.
- Detection of silicon monoxide (SiO) line polarization.
Main Results:
- Clear detection of SiO line polarization in the HH 211 jet.
- The polarization is attributed to the Goldreich-Kylafis effect, indicating magnetic field presence.
- The results confirm magnetic fields in jets from low-mass protostars.
Conclusions:
- Magnetic fields are definitively present in protostellar jets.
- The detected magnetic field is likely toroidal, consistent with models of jet collimation at large distances.
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