Detalles de publicación
PP 022068
The JCMT BISTRO Survey: A Spiral Magnetic Field in a Hub-Filament Structure, Monoceros R2
1 Korea Astronomy and Space Science Institute (KASI), 776 Daedeokdae-ro, Yuseong-gu, Daejeon 34055, Republic of Korea
2 University of Science and Technology, Korea (UST), 217 Gajeong-ro, Yuseong-gu, Daejeon 34113, Republic of Korea
3 Department of Physics and Astronomy, University College London, WC1E 6BT London, UK
4 Academia Sinica Institute of Astronomy and Astrophysics, No.1, Sec. 4., Roosevelt Road, Taipei 10617, Taiwan
5 NRC Herzberg Astronomy and Astrophysics, 5071 West Saanich Road, Victoria, BC V9E 2E7, Canada
6 Department of Physics and Astronomy, University of Victoria, Victoria, BC V8W 2Y2, Canada
7 Division of Theoretical Astronomy, National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588, Japan
8 SOKENDAI (The Graduate University for Advanced Studies), Hayama, Kanagawa 240-0193, Japan
9 School of Physics and Astronomy, Cardiff University, The Parade, Cardiff, CF24 3AA, UK
10 Institute of Liberal Arts and Sciences Tokushima University, Minami Jousanajima-machi 1-1, Tokushima 770-8502, Japan
11 Department of Astronomy and Space Science, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon 34134, Republic of
Korea
12 Division of Science, National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
13 Department of Earth Science Education, Seoul National University (SNU), 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
14 SNU Astronomy Research Center, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
15 Department of Astronomy, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
16 National Astronomical Observatory of Japan, National Institutes of Natural Sciences, Osawa, Mitaka, Tokyo 181-8588, Japan
17 Astrobiology Center, National Institutes of Natural Sciences, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
18 Indian Institute of Astrophysics, II Block, Koramangala, Bengaluru 560034, India
19 Basic science building 108, 50 UNIST-gil, Eonyang-eup, Ulju-gun, Ulsan
20 Department of Physics, Faculty of Science and Engineering, Meisei University, 2-1-1 Hodokubo, Hino, Tokyo 191-8506, Japan
21 Indian Institute of Science Education and Research (IISER) Tirupati, Rami Reddy Nagar, Karakambadi Road, Mangalam (P.O.), Tirupati 517 507, India
22 Jeremiah Horrocks Institute, University of Central Lancashire, Preston PR1 2HE, UK
23 Department of Astronomy, Yunnan University, Kunming, 650091, PR China
24 Xinjiang Astronomical Observatory, Chinese Academy of Sciences, 830011 Urumqi, People’s Republic of China
25 Institute of Astronomy, National Central University, Zhongli 32001, Taiwan
26 Faculty of Education & Center for Educational Development and Support, Kagawa University, Saiwai-cho 1-1, Takamatsu, Kagawa, 760-8522, Japan
27 Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU, WPI), UTIAS, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan
28 University of Science and Technology of Hanoi (USTH), Vietnam Academy of Science and Technology (VAST), 18 Hoang Quoc Viet, Hanoi, Vietnam
29 Purple Mountain Observatory, Chinese Academy of Sciences, 10 Yuanhua Road, 210023, Nanjing, China
30 SOFIA Science Center, Universities Space Research Association, NASA Ames Research Center, Moffett Field, California 94035, USA
31 Université Paris-Saclay, CNRS, CEA, Astrophysique, Instrumentation et ModA ̃©lisation de Paris-Saclay, 91191 Gif-sur-Yvette, France
32 Instituto de Astrofisíca de Canarias, 38200 La Laguna,Tenerife, Canary Islands, Spain
33 Departamento de Astrofísica, Universidad de La Laguna (ULL), 38206 La Laguna, Tenerife, Spain
34 Centre de recherche en astrophysique du Qu ́ebec & d ́epartement de physique, Universit ́e de Montr ́eal, 1375, Avenue
Th ́er`ese-Lavoie-Roux, Montr ́eal, QC, H2V 0B3, Canada
35 School of Astronomy and Space Science, Nanjing University, 163 Xianlin Avenue, Nanjing 210023, People’s Republic of China
36 Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University), Ministry of Education, Nanjing 210023, People’s Republic of China
37 Institute of Astronomy and Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan
38 Department of Physics and Astronomy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
39 Department of Astronomy and Atmospheric Sciences, Kyungpook National University, Daegu 41566, Republic of Korea
40 School of Space Research, Kyung Hee University, 1732 Deogyeong-daero, Giheung-gu, Yongin-si, Gyeonggi-do 17104, Republic of Korea
41 East Asian Observatory, 660 N. A’oho ̄ku ̄ Place, University Park, Hilo, HI 96720, USA
42 School of Space Research, Kyung Hee University, 1732 Deogyeong-daero, Giheung-gu, Yongin-si, Gyeonggi-do, 17104, Republic of Korea
43 Department of Physics and Astronomy, The University of Manitoba, Winnipeg, Manitoba R3T2N2, Canada
44 Department for Physics, Engineering Physics and Astrophysics, Queen’s University, Kingston, ON, K7L 3N6, Canada
45 Department of Physics and Astronomy, The University of Western Ontario, 1151 Richmond Street, London N6A 3K7, Canada
46 Department of Physics and Astronomy, McMaster University, Hamilton, ON L8S 4M1 Canada
47 Department of Physics and Atmospheric Science, Dalhousie University, Halifax B3H 4R2, Canada
48 Banting and KIPAC Fellow: Kavli Institute for Particle Astrophysics & Cosmology (KIPAC), Stanford University, Stanford, CA 94305, USA
49 Dominion Radio Astrophysical Observatory, Herzberg Astronomy and Astrophysics Research Centre, National Research Council Canada, P. O. Box 248, Penticton, BC V2A 6J9 Canada
50 Research Center for Intelligent Computing Platforms, Zhejiang Lab, Hangzhou 311100, People’s Republic of China
51 Chinese Academy of Sciences South America Center for Astronomy (CASSACA), National Astronomical Observatories(NAOC), 20A Datun Road, Beijing 100012, China
52 National Astronomical Observatories, Chinese Academy of Sciences, A20 Datun Road, Chaoyang District, Beijing 100012, People’s Republic of China
53 Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030, People’s Republic of China
54 Department of Physics, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong
55 Department of Space, Earth & Environment, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden
56 Xinjiang Astronomical Observatory, Chinese Academy of Sciences, 150 Science 1-Street, Urumqi 830011, Xinjiang, People’s Republic of China
57 Research Center for Intelligent Computing, Zhejiang Laboratory, Hangzhou 311100, China
58 Key Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030, People’s Republic of China
59 CAS Key Laboratory of FAST, National Astronomical Observatories, Chinese Academy of Sciences, People’s Republic of China
60 Purple Mountain Observatory, Chinese Academy of Sciences, 2 West Beijing Road, 210008 Nanjing, People’s Republic of China
61 Department of Astronomy, Beijing Normal University, Beijing 100875, China
62 Gemini Observatory/NSF’s NOIRLab, 670 N. A’ohoku Place, Hilo, HI 96720, USA
63 Department of Earth Science and Astronomy, Graduate School of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro,
Tokyo 153-8902, Japan
64 Subaru Telescope, National Astronomical Observatory of Japan, 650 N. A’oh ̄oku ̄ Place, Hilo, HI 96720, USA
65 National Astronomical Observatory of Japan, Alonso de Co ́rdova 3788, Office 61B, Vitacura, Santiago, Chile
66 Joint ALMA Observatory, Alonso de Co ́rdova 3107, Vitacura, Santiago, Chile
67 NAOJ Fellow
68 Department of Physics, Konan University, Okamoto 8-9-1, Higashinada-ku, Kobe 658-8501, Japan
69 Department of Physics, Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan
70 Department of Environmental Systems Science, Doshisha University, Tatara, Miyakodani 1-3, Kyotanabe, Kyoto 610-0394, Japan
71 Hiroshima Astrophysical Science Center, Hiroshima University, Kagamiyama 1-3-1, Higashi-Hiroshima, Hiroshima 739-8526, Japan
72 Department of Physics, Hiroshima University, Kagamiyama 1-3-1, Higashi-Hiroshima, Hiroshima 739-8526, Japan
73 Core Research for Energetic Universe (CORE-U), Hiroshima University, Kagamiyama 1-3-1, Higashi-Hiroshima, Hiroshima 739-8526, Japan
74 Nobeyama Radio Observatory, National Astronomical Observatory of Japan, National Institutes of Natural Sciences, Nobeyama, Minamimaki, Minamisaku, Nagano 384-1305, Japan
75 Department of Astronomy, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
76 Department of Physics and Astronomy, Graduate School of Science and Engineering, Kagoshima University, 1-21-35 Korimoto, Kagoshima, Kagoshima 890-0065, Japan
77 Faculty of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
78 Department of Physics, School of Science and Technology, Kwansei Gakuin University, 2-1 Gakuen, Sanda, Hyogo 669-1337, Japan
79 National Chung Hsing University, 145 Xingda Rd., South Dist., Taichung City 402, Taiwan
80 Institut de Ciencies de l’Espai (ICE, CSIC), Can Magrans, s/n, 08193 Bellaterra, Barcelona, Spain
81 ICREA, Pg. Llu ́ıs Companys 23, Barcelona, Spain
82 Institut d’Estudis Espacials de Catalunya (IEEC), E-08034 Barcelona, Spain
83 SKA Observatory, Jodrell Bank, Lower Withington, Macclesfield SK11 9FT, UK
84 Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, University of Manchester, Oxford Road, Manchester, M13 9PL, UK
85 Armagh Observatory and Planetarium, College Hill, Armagh BT61 9DG, UK
86 University of South Wales, Pontypridd, CF37 1DL, UK
87 Department of Applied Mathematics, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, UK
88 School of Physics, Astronomy & Mathematics, University of Hertfordshire, College Lane, Hatfield, Hertfordshire AL10 9AB, UK
89 Physics and Astronomy, University of Exeter, Stocker Road, Exeter EX4 4QL, UK
90 Astrophysics Research Institute, Liverpool John Moores University, 146 Brownlow Hill, Liverpool L3 5RF, UK
91 School of Physics and Astronomy, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, UK
92 Physics & Astronomy Dept., University College London, WC1E 6BT London, UK
93 Astrophysics Group, Cavendish Laboratory, J. J. Thomson Avenue, Cambridge CB3 0HE, UK
94 Kavli Institute for Cosmology, Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge, CB3 0HA, UK
95 OSL, Physics & Astronomy Dept., University College London, WC1E 6BT London, UK
96 Vietnam National Space Center, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Hanoi, Vietnam
97 Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam
98 Laboratoire AIM CEA/DSM-CNRS-Universit ́e Paris Diderot, IRFU/Service d’Astrophysique, CEA Saclay, F-91191 Gif-sur-Yvette, France
99 Jet Propulsion Laboratory, M/S 169-506, 4800 Oak Grove Drive, Pasadena, CA 91109, USA
100 National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903, USA
101 Univ. Grenoble Alpes, CNRS, IPAG, 38000 Grenoble, France
We present and analyze observations of polarized dust emission at 850 μm towards the central 1 pc × 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 ± 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, 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.

