The JCMT BISTRO Survey: A Spiral Magnetic Field in a Hub-filament Structure, Monoceros R2
Creators: name: Hwang, Jihye
name: Kim, Jongsoo
name: Pattle, Kate
name: Lee, Chang Won
name: Koch, Patrick M.
name: Johnstone, Doug
name: Tomisaka, Kohji
name: Whitworth, Anthony
name: Furuya, Ray S.
name: Kang, Ji-hyun
name: Lyo, A-Ran
name: Chung, Eun Jung
name: Arzoumanian, Doris
name: Park, Geumsook
name: Kwon, Woojin
name: Kim, Shinyoung
name: Tamura, Motohide
name: Kwon, Jungmi
name: Soam, Archana
name: Han, Ilseung
name: Hoang, Thiem
name: Kim, Kyoung Hee
name: Onaka, Takashi
name: Chakali, Eswaraiah
name: Ward-Thompson, Derek
name: Liu, Hong-Li
name: Tang, Xindi
name: Chen, Wen Ping
name: Matsumura, Masafumi
name: Hoang, Thuong Duc
name: Chen, Zhiwei
name: Gouellec, Valentin J. M. Le
name: Kirchschlager, Florian
name: Poidevin, Fr ed erick
name: Bastien, Pierre
name: Qiu, Keping
name: Hasegawa, Tetsuo
name: Lai, Shih-Ping
name: Byun, Do-Young
name: Cho, Jungyeon
name: Choi, Minho
name: Choi, Youngwoo
name: Choi, Yunhee
name: Jeong, Il-Gyo
name: Kang, Miju
name: Kim, Hyosung
name: Kim, Kee-tae
name: Lee, Jeong-Eun
name: Lee, Sang-sung
name: Lee, Yong-Hee
name: Lee, Hyeseung
name: Kim, Mi-Ryang
name: Yoo, Hyunju
name: Yun, Hyeong-Sik
name: Chen, Mike
name: Di Francesco, James
name: Fiege, Jason
name: Fissel, Laura M.
name: Franzmann, Erica
name: Houde, Martin
name: Lacaille, Kevin
name: Matthews, Brenda
name: Sadavoy, Sarah
name: Moriarty-Schieven, Gerald
name: Tahani, Mehrnoosh
name: Ching, Tao-Chung
name: Dai, Y. Sophia
name: Duan, Yan
name: Gu, Qilao
name: Law, Chi-Yan
name: Li, Dalei
name: Li, Di
name: Li, Guangxing
name: Li, Hua-bai
name: Liu, Tie
name: Lu, Xing
name: Qian, Lei
name: Wang, Hongchi
name: Wu, Jintai
name: Xie, Jinjin
name: Yuan, Jinghua
name: Zhang, Chuan-Peng
name: Zhang, Guoyin
name: Zhang, Yapeng
name: Zhou, Jianjun
name: Zhu, Lei
name: Berry, David
name: Friberg, Per
name: Graves, Sarah
name: Liu, Junhao
name: Mairs, Steve
name: Parsons, Harriet
name: Rawlings, Mark
name: Doi, Yasuo
name: Hayashi, Saeko
name: Hull, Charles L. H.
name: Inoue, Tsuyoshi
name: Inutsuka, Shu-ichiro
name: Iwasaki, Kazunari
name: Kataoka, Akimasa
name: Kawabata, Koji
name: Kim, Gwanjeong
name: Kobayashi, Masato I. N.
name: Nagata, Tetsuya
name: Nakamura, Fumitaka
name: Nakanishi, Hiroyuki
name: Pyo, Tae-Soo
name: Saito, Hiro
name: Seta, Masumichi
name: Shimajiri, Yoshito
name: Shinnaga, Hiroko
name: Tsukamoto, Yusuke
name: Zenko, Tetsuya
name: Chen, Huei-Ru Vivien
name: Duan, Hao-Yuan
name: Fanciullo, Lapo
name: Kemper, Francisca
name: Lee, Chin-Fei
name: Lin, Sheng-Jun
name: Liu, Sheng-Yuan
name: Ohashi, Nagayoshi
name: Rao, Ramprasad
name: Tang, Ya-Wen
name: Wang, Jia-Wei
name: Yang, Meng-Zhe
name: Yen, Hsi-Wei
name: Bourke, Tyler L.
name: Chrysostomou, Antonio
name: Debattista, Victor
name: Eden, David
name: Eyres, Stewart
name: Falle, Sam
name: Fuller, Gary
name: Gledhill, Tim
name: Greaves, Jane
name: Griffin, Matt
name: Hatchell, Jennifer
name: Karoly, Janik
name: Kirk, Jason
name: Konyves, Vera
name: Longmore, Steven
name: van Loo, Sven
name: de Looze, Ilse
name: Peretto, Nicolas
name: Priestley, Felix
name: Rawlings, Jonathan
name: Retter, Brendan
name: Richer, John
name: Rigby, Andrew
name: Savini, Giorgio
name: Scaife, Anna
name: Viti, Serena
name: Diep, Pham Ngoc
name: Ngoc, Nguyen Bich
name: Tram, Le Ngoc
name: Andre, Philippe
name: Coude, Simon
name: Dowell, C. Darren
name: Friesen, Rachel
name: Robitaille, Jean-Franc ois
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: We present and analyze observations of polarized dust emission at 850 $μ$m towards the central 1 pc $\times$ 1 pc hub-filament structure of Monoceros R2 (Mon R2). The data are obtained with SCUBA-2/POL-2 on the James Clerk Maxwell Telescope (JCMT) as part of the BISTRO (B-fields in Star-forming Region Observations) survey. The orientations of the magnetic field follow the spiral structure of Mon R2, which are well-described by an axisymmetric magnetic field model. We estimate the turbulent component of the magnetic field using the angle difference between our observations and the best-fit model of the underlying large-scale mean magnetic field. This estimate is used to calculate the magnetic field strength using the Davis-Chandrasekhar-Fermi method, for which we also obtain the distribution of volume density and velocity dispersion using a column density map derived from $Herschel$ data and the C$^{18}$O ($J$ = 3-2) data taken with HARP on the JCMT, respectively. We make maps of magnetic field strengths and mass-to-flux ratios, finding that magnetic field strengths vary from 0.02 to 3.64 mG with a mean value of 1.0 $\pm$ 0.06 mG, and the mean critical mass-to-flux ratio is 0.47 $\pm$ 0.02. Additionally, the mean Alfvén Mach number is 0.35 $\pm$ 0.01. This suggests that in Mon R2, magnetic fields provide resistance against large-scale gravitational collapse, and magnetic pressure exceeds turbulent pressure. We also investigate the properties of each filament in Mon R2. Most of the filaments are aligned along the magnetic field direction and are magnetically sub-critical.
description: This paper is accepted to the ApJ