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The JCMT BISTRO-2 survey: magnetic fields of the massive DR21 filament

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DOIResolve DOI: https://doi.org/10.3847/1538-4357/ac9dfb
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Affiliation
  1. National Research Council of Canada. Herzberg Astronomy and Astrophysics
FunderSearch for: National Natural Science Foundation of China; Search for: National Natural Science Foundation of China; Search for: National Natural Science Foundation of China; Search for: National Natural Science Foundation of China; Search for: Ministry of Science and Technology, Taiwan; Search for: Ministry of Science and Technology, Taiwan; Search for: Ministry of Science and Technology, Taiwan; Search for: National Research Foundation of Korea; Search for: National Research Foundation of Korea; Search for: DST ∣ Science and Engineering Research Board; Search for: MEXT ∣ Japan Society for the Promotion of Science; Search for: MEXT ∣ Japan Society for the Promotion of Science; Search for: MEXT ∣ Japan Society for the Promotion of Science; Search for: MEXT ∣ Japan Society for the Promotion of Science; Search for: MEXT ∣ Japan Society for the Promotion of Science; Search for: MEXT ∣ Japan Society for the Promotion of Science; Search for: Royal Society University Research Fellow; Search for: National Research Foundation of Korea; Search for: MIST Korea Astronomy and Space Science Institute; Search for: Ministry of Science and Technology, Taiwan; Search for: Ministry of Science and Technology, Taiwan
FormatText, Article
Subjectmolecular clouds; protoplanetary disk; magnetic field
Abstract
We present 850 μm dust polarization observations of the massive DR21 filament from the B-fields In STar-forming Region Observations (BISTRO) survey, using the POL-2 polarimeter and the SCUBA-2 camera on the James Clerk Maxwell Telescope. We detect ordered magnetic fields perpendicular to the parsec-scale ridge of the DR21 main filament. In the subfilaments, the magnetic fields are mainly parallel to the filamentary structures and smoothly connect to the magnetic fields of the main filament. We compare the POL-2 and Planck dust polarization observations to study the magnetic field structures of the DR21 filament on 0.1–10 pc scales. The magnetic fields revealed in the Planck data are well-aligned with those of the POL-2 data, indicating a smooth variation of magnetic fields from large to small scales. The plane-of-sky magnetic field strengths derived from angular dispersion functions of dust polarization are 0.6–1.0 mG in the DR21 filament and ∼0.1 mG in the surrounding ambient gas. The mass-to-flux ratios are found to be magnetically supercritical in the filament and slightly subcritical to nearly critical in the ambient gas. The alignment between column density structures and magnetic fields changes from random alignment in the low-density ambient gas probed by Planck to mostly perpendicular in the high-density main filament probed by James Clerk Maxwell Telescope. The magnetic field structures of the DR21 filament are in agreement with MHD simulations of a strongly magnetized medium, suggesting that magnetic fields play an important role in shaping the DR21 main filament and subfilaments.
Publication date
PublisherIOP Publishing
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  • The Astrophysical Journal 941, no. 2 (1 December 2022): 122–.
LanguageEnglish
Peer reviewedYes
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Record identifiere75e6790-65fd-417f-9f99-172aea70f129
Record created2024-04-02
Record modified2024-04-02
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