The JCMT BISTRO Survey: a spiral magnetic field in a hub-filament structure, Monoceros R2

Hwang, Jihye, Kim, Jongsoo, Pattle, Kate, Lee, Chang Won, Koch, Patrick M., Johnstone, Doug, Tomisaka, Kohji, Whitworth, Anthony ORCID: https://orcid.org/0000-0002-1178-5486, Furuya, Ray S., Kang, Ji-hyun, Lyo, A-Ran, Chung, Eun Jung, Arzoumanian, Doris, Park, Geumsook, Kwon, Woojin, Kim, Shinyoung, Tamura, Motohide, Kwon, Jungmi, Soam, Archana, Han, Ilseung, Hoang, Thiem, Kim, Kyoung Hee, Onaka, Takashi, Eswaraiah, Chakali, Ward-Thompson, Derek ORCID: https://orcid.org/0000-0003-1140-2761, Liu, Hong-Li, Tang, Xindi, Chen, Wen Ping, Matsumura, Masafumi, Hoang, Thuong Duc, Chen, Zhiwei, Le Gouellec, Valentin J. M., Kirchschlager, Florian, Poidevin, Frédérick, Bastien, Pierre, Qiu, Keping, Hasegawa, Tetsuo, Lai, Shih-Ping, Byun, Do-Young, Cho, Jungyeon, Choi, Minho, Choi, Youngwoo, Choi, Yunhee, Jeong, Il-Gyo, Kang, Miju, Kim, Hyosung, Kim, Kee-Tae, Lee, Jeong-Eun, Lee, Sang-Sung, Lee, Yong-Hee, Lee, Hyeseung, Kim, Mi-Ryang, Yoo, Hyunju, Yun, Hyeong-Sik, Chen, Mike, Francesco, James Di, Fiege, Jason, Fissel, Laura M., Franzmann, Erica, Houde, Martin, Lacaille, Kevin, Matthews, Brenda, Sadavoy, Sarah, Moriarty-Schieven, Gerald, Tahani, Mehrnoosh, Ching, Tao-Chung, Dai, Y. Sophia, Duan, Yan, Gu, Qilao, Law, Chi-Yan, Li, Dalei, Li, Di, Li, Guangxing, Li, Hua-bai, Liu, Tie, Lu, Xing, Qian, Lei, Wang, Hongchi, Wu, Jintai, Xie, Jinjin, Yuan, Jinghua, Zhang, Chuan-Peng, Zhang, Guoyin, Zhang, Yapeng, Zhou, Jianjun, Zhu, Lei, Berry, David, Friberg, Per, Graves, Sarah, Liu, Junhao, Mairs, Steve, Parsons, Harriet, Rawlings, Mark, Doi, Yasuo, Hayashi, Saeko, Hull, Charles L. H., Inoue, Tsuyoshi, Inutsuka, Shu-ichiro, Iwasaki, Kazunari, Kataoka, Akimasa, Kawabata, Koji, Kim, Gwanjeong, Kobayashi, Masato I. N., Nagata, Tetsuya, Nakamura, Fumitaka, Nakanishi, Hiroyuki, Pyo, Tae-Soo, Saito, Hiro, Seta, Masumichi, Shimajiri, Yoshito, Shinnaga, Hiroko, Tsukamoto, Yusuke, Zenko, Tetsuya, Chen, Huei-Ru Vivien, Duan, Hao-Yuan, Fanciullo, Lapo, Kemper, Francisca, Lee, Chin-Fei, Lin, Sheng-Jun, Liu, Sheng-Yuan, Ohashi, Nagayoshi, Rao, Ramprasad, Tang, Ya-Wen, Wang, Jia-Wei, Yang, Meng-Zhe, Yen, Hsi-Wei, Bourke, Tyler L., Chrysostomou, Antonio, Debattista, Victor, Eden, David, Eyres, Stewart, Falle, Sam, Fuller, Gary, Gledhill, Tim, Greaves, Jane ORCID: https://orcid.org/0000-0002-3133-413X, Griffin, Matt ORCID: https://orcid.org/0000-0002-0033-177X, Hatchell, Jennifer, Karoly, Janik, Kirk, Jason, Könyves, Vera, Longmore, Steven, van Loo, Sven, Looze, Ilse de, Peretto, Nicolas ORCID: https://orcid.org/0000-0002-6893-602X, Priestley, Felix, Rawlings, Jonathan, Retter, Brendan, Richer, John, Rigby, Andrew, Savini, Giorgio, Scaife, Anna, Viti, Serena, Diep, Pham Ngoc, Ngoc, Nguyen Bich, Tram, Le Ngoc, André, Philippe, Coudé, Simon, Dowell, C. Darren, Friesen, Rachel and Robitaille, Jean-Franćois 2022. The JCMT BISTRO Survey: a spiral magnetic field in a hub-filament structure, Monoceros R2. Astrophysical Journal 941 (1) , 51. 10.3847/1538-4357/ac99e0

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Abstract

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.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Additional Information:	License information from Publisher: LICENSE 1: URL: http://creativecommons.org/licenses/by/4.0/, Type: cc-by
Publisher:	American Astronomical Society
ISSN:	0004-637X
Date of First Compliant Deposit:	13 December 2022
Date of Acceptance:	11 October 2022
Last Modified:	11 May 2023 12:22
URI:	https://orca.cardiff.ac.uk/id/eprint/154926

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