The JCMT BISTRO Survey: A Spiral Magnetic Field in a Hub-filament Structure, Monoceros R2
Journal article, 2022
We present and analyze observations of polarized dust emission at 850 μm toward the central 1 × 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 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 C18O (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 ± 0.06 mG, and the mean critical mass-to-flux ratio is 0.47 ± 0.02. Additionally, the mean Alfvén Mach number is 0.35 ± 0.01. This suggests that, in Mon R2, the magnetic fields provide resistance against large-scale gravitational collapse, and the magnetic pressure exceeds the 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 subcritical.
Author
Jihye Hwang
University of Science and Technology (UST)
Korea Astronomy and Space Science Institute
Jongsoo Kim
University of Science and Technology (UST)
Korea Astronomy and Space Science Institute
Kate Pattle
University College London (UCL)
Chang Won Lee
University of Science and Technology (UST)
Korea Astronomy and Space Science Institute
Patrick M. Koch
Academia Sinica
D. Johnstone
National Research Council Canada
University of Victoria
Kohji Tomisaka
The Graduate University for Advanced Studies (SOKENDAI)
National Astronomical Observatory of Japan
Anthony Whitworth
Cardiff University
Ray S. Furuya
Tokushima University
Ji-hyun Kang
Korea Astronomy and Space Science Institute
A. Lyo
Korea Astronomy and Space Science Institute
Eun Jung Chung
Chungnam National University
Doris Arzoumanian
National Astronomical Observatory of Japan
Geumsook Park
Korea Astronomy and Space Science Institute
Woojin Kwon
Seoul National University
Shinyoung Kim
Korea Astronomy and Space Science Institute
Motohide Tamura
National Astronomical Observatory of Japan
National Institutes of Natural Sciences
University of Tokyo
Jungmi Kwon
University of Tokyo
Archana Soam
Indian Institute of Astrophysics
Ilseung Han
University of Science and Technology (UST)
Korea Astronomy and Space Science Institute
Thiem Hoang
University of Science and Technology (UST)
Korea Astronomy and Space Science Institute
Kyoung Hee Kim
Korea Astronomy and Space Science Institute
Takashi Onaka
Faculty of Science and Engineering
University of Tokyo
Chakali Eswaraiah
Indian Institute of Science Education and Research (IISER), Tirupati
D. Ward-Thompson
University of Central Lancashire
Hong-Li Liu
Yunnan University
X. D. Tang
Xinjiang Astronomical Observatory
Wen Ping Chen
National Central University
Masafumi Matsumura
Kagawa University
Thuong Duc Hoang
Vietnam Academy of Science and Technology
University of Tokyo
Zhiwei Chen
Chinese Academy of Sciences
Valentin J. M. Le Gouellec
University Paris-Saclay
Universities Space Research Association
F. Kirchschlager
University College London (UCL)
Frédérick Poidevin
Instituto de Astrofísica de Canarias
University of La Laguna
Pierre Bastien
Université de Montréal
Keping Qiu
Nanjing University
Tetsuo Hasegawa
National Astronomical Observatory of Japan
Shih-Ping Lai
Academia Sinica
National Tsing Hua University
Do Young Byun
Korea Astronomy and Space Science Institute
University of Science and Technology (UST)
Jungyeon Cho
Chungnam National University
Minho Choi
Korea Astronomy and Space Science Institute
Youngwoo Choi
Seoul National University
Yunhee Choi
Korea Astronomy and Space Science Institute
Il-Gyo Jeong
Korea Astronomy and Space Science Institute
Kyungpook National University
Miju Kang
Korea Astronomy and Space Science Institute
Hyosung Kim
Seoul National University
Kee-Tae Kim
Korea Astronomy and Space Science Institute
University of Science and Technology (UST)
Jeong Eun Lee
Seoul National University
Sang Sung Lee
Korea Astronomy and Space Science Institute
University of Science and Technology (UST)
Yong-Hee Lee
Kyung Hee University
East Asian Observatory
Hyeseung Lee
Chungnam National University
Mi-Ryang Kim
Seoul National University
Hyunju Yoo
Chungnam National University
Hyeong-Sik Yun
Korea Astronomy and Space Science Institute
Michael Chun-Yuan Chen
University of Victoria
J. Di Francesco
University of Victoria
National Research Council Canada
J. Fiege
University of Manitoba
Laura M. Fissel
Queen's University
Erica Franzmann
University of Manitoba
D. Johnstone
Western University
Kevin Lacaille
Dalhousie University
McMaster University
B. C. Matthews
National Research Council Canada
University of Victoria
S. I. Sadavoy
Queen's University
Gerald H. Moriarty-Schieven
National Research Council Canada
M. Tahani
National Research Council Canada
Stanford University
Tao-Chung Ching
Zhejiang Lab
Y. Sophia Dai
Chinese Academy of Sciences
Yan Duan
Chinese Academy of Sciences
Qilao Gu
Shanghai Astronomical Observatory
Chi Yan Law
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
Chinese University of Hong Kong
Dalei Li
Xinjiang Astronomical Observatory
D. Li
Zhejiang Lab
Guangxing Li
Yunnan University
Hua-Bai Li
Shanghai Astronomical Observatory
Tie Liu
Shanghai Astronomical Observatory
X. Lu
Shanghai Astronomical Observatory
Lei Qian
Chinese Academy of Sciences
Hongchi Wang
Chinese Academy of Sciences
Jintai Wu
Nanjing University
Jinjin Xie
Chinese Academy of Sciences
Jinghua Yuan
Chinese Academy of Sciences
Chuan-Peng Zhang
Chinese Academy of Sciences
Guoyin Zhang
Chinese Academy of Sciences
Yapeng Zhang
Beijing Normal University
Jianjun Zhou
Xinjiang Astronomical Observatory
Lei Zhu
Chinese Academy of Sciences
David Berry
East Asian Observatory
P. Friberg
East Asian Observatory
Sarah F. Graves
East Asian Observatory
Junhao Liu
East Asian Observatory
Steve Mairs
East Asian Observatory
Harriet Parsons
East Asian Observatory
M.G. Rawlings
Gemini Observatory North
East Asian Observatory
Yasuo Doi
University of Tokyo
Saeko Hayashi
National Astronomical Observatory of Japan
Charles L. H. Hull
National Astronomical Observatory of Japan
Atacama Large Millimeter-submillimeter Array (ALMA)
Tsuyoshi Inoue
Konan University
Shu-Ichiro Inutsuka
Nagoya University
Kazunari Iwasaki
Doshisha University
Akimasa Kataoka
National Astronomical Observatory of Japan
Astrophysical Journal
0004-637X (ISSN) 1538-4357 (eISSN)
Vol. 941 1 51Subject Categories (SSIF 2011)
Astronomy, Astrophysics and Cosmology
Geophysics
Fusion, Plasma and Space Physics
DOI
10.3847/1538-4357/ac99e0