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

Korea Astronomy and Space Science Institute

University of Science and Technology (UST)

Jongsoo Kim

Korea Astronomy and Space Science Institute

University of Science and Technology (UST)

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

University of Victoria

National Research Council Canada

Kohji Tomisaka

National Astronomical Observatory of Japan

The Graduate University for Advanced Studies (SOKENDAI)

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

Korea Astronomy and Space Science Institute

University of Science and Technology (UST)

Kyoung Hee Kim

Korea Astronomy and Space Science Institute

Takashi Onaka

University of Tokyo

Faculty of Science and Engineering

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

National Tsing Hua University

Academia Sinica

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

Kyungpook National University

Korea Astronomy and Space Science Institute

Miju Kang

Korea Astronomy and Space Science Institute

Hyosung Kim

Seoul National University

Kee-Tae Kim

University of Science and Technology (UST)

Korea Astronomy and Space Science Institute

Jeong Eun Lee

Seoul National University

Sang Sung Lee

Korea Astronomy and Space Science Institute

University of Science and Technology (UST)

Yong-Hee Lee

East Asian Observatory

Kyung Hee University

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

Kevin Lacaille

McMaster University

Dalhousie 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

Chinese University of Hong Kong

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics

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

East Asian Observatory

Gemini Observatory North

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 51

Subject Categories

Astronomy, Astrophysics and Cosmology

Geophysics

Fusion, Plasma and Space Physics

DOI

10.3847/1538-4357/ac99e0

More information

Latest update

4/3/2024 1