TY - JOUR
T1 - The JCMT BISTRO-2 Survey
T2 - Magnetic Fields of the Massive DR21 Filament
AU - BISTRO
AU - Ching, Tao-Chung
AU - Qiu, Keping
AU - Li, Di
AU - Ren, Zhiyuan
AU - Lai, Shih-Ping
AU - Berry, David
AU - Pattle, Kate
AU - Furuya, Ray
AU - Ward-Thompson, Derek
AU - Johnstone, Doug
AU - Koch, Patrick M.
AU - Lee, Chang Won
AU - Hoang, Thiem
AU - Hasegawa, Tetsuo
AU - Kwon, Woojin
AU - Bastien, Pierre
AU - Eswaraiah, Chakali
AU - Wang, Jia-Wei
AU - Kim, Kyoung Hee
AU - Hwang, Jihye
AU - Soam, Archana
AU - Lyo, A-Ran
AU - Liu, Junhao
AU - Gouellec, Valentin J. M. Le
AU - Arzoumanian, Doris
AU - Whitworth, Anthony
AU - Francesco, James Di
AU - Poidevin, Frederick
AU - Liu, Tie
AU - Coude, Simon
AU - Tahani, Mehrnoosh
AU - Liu, Hong-Li
AU - Onaka, Takashi
AU - Li, Dalei
AU - Tamura, Motohide
AU - Chen, Zhiwei
AU - Tang, Xindi
AU - Kirchschlager, Florian
AU - Bourke, Tyler L.
AU - Byun, Do-Young
AU - Chen, Mike
AU - Chen, Huei-Ru Vivien
AU - Chen, Wen Ping
AU - Cho, Jungyeon
AU - Choi, Yunhee
AU - Choi, Youngwoo
AU - Choi, Minho
AU - Chrysostomou, Antonio
AU - Gledhill, Tim
AU - Parsons, Harriet
N1 - 26 pages, 13 figures, ApJ accepted
PY - 2022/12/5
Y1 - 2022/12/5
N2 - We present 850 $\mu$m 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 sub-filaments, 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 $\sim$ 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 JCMT. 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 sub-filaments.
AB - We present 850 $\mu$m 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 sub-filaments, 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 $\sim$ 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 JCMT. 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 sub-filaments.
KW - astro-ph.GA
KW - astro-ph.SR
U2 - 10.3847/1538-4357/ac9dfb
DO - 10.3847/1538-4357/ac9dfb
M3 - Article
VL - 941
SP - 122
EP - 142
JO - The Astrophysical Journal
JF - The Astrophysical Journal
SN - 0004-637X
ER -