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The JCMT BISTRO-2 Survey: Magnetic Fields of the Massive DR21 Filament

Published version
Peer-reviewed

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Abstract

jats:titleAbstract</jats:title> jats:pWe present 850 jats:italicμ</jats:italic>m dust polarization observations of the massive DR21 filament from the jats:italicB</jats:italic>-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.</jats:p>

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Keywords

5101 Astronomical Sciences, 51 Physical Sciences

Journal Title

Astrophysical Journal

Conference Name

Journal ISSN

0004-637X
1538-4357

Volume Title

Publisher

American Astronomical Society
Sponsorship
National Natural Science Foundation of China (NSFC) (U1931117)
National Natural Science Foundation of China (NSFC) (11988101)
National Natural Science Foundation of China (NSFC) (11725313)
National Natural Science Foundation of China (NSFC) (12073061)
Ministry of Science and Technology, Taiwan (MOST) (109-2112-M-001-022)
Ministry of Science and Technology, Taiwan (MOST) (110-2112-M-001-057)
Ministry of Science and Technology, Taiwan (MOST) (107-2119-M-001-031-MY3)
National Research Foundation of Korea (NRF) (2019R1A2C1087045)
National Research Foundation of Korea (NRF) (2021R1F1A1061794)
DST ∣ Science and Engineering Research Board (SERB) (RJF/2020/000071)
MEXT ∣ Japan Society for the Promotion of Science (JSPS) (18H05442)
MEXT ∣ Japan Society for the Promotion of Science (JSPS) (15H02063)
MEXT ∣ Japan Society for the Promotion of Science (JSPS) (22000005)
MEXT ∣ Japan Society for the Promotion of Science (JSPS) (19K14775)
MEXT ∣ Japan Society for the Promotion of Science (JSPS) (18K13586)
MEXT ∣ Japan Society for the Promotion of Science (JSPS) (20K14527)
Royal Society University Research Fellow (URF\R1\211322)
National Research Foundation of Korea (NRF) (2019R1A2C1010851)
MIST Korea Astronomy and Space Science Institute (2022-1-840-05)
Ministry of Science and Technology, Taiwan (MOST) (109-2112-M-005-003-MY3)
Ministry of Science and Technology, Taiwan (MOST) (111-2811-M-005-007)