JCMT BISTRO Survey: Magnetic Fields within the Hub-filament Structure in IC 5146

Jia Wei Wang, Shih Ping Lai, Chakali Eswaraiah, Kate Pattle, James Di Francesco, Doug Johnstone, Patrick M. Koch, Tie Liu, Motohide Tamura, Ray S. Furuya, Takashi Onaka, Derek Ward-Thompson, Archana Soam, Kee Tae Kim, Chang Won Lee, Chin Fei Lee, Steve Mairs, Doris Arzoumanian, Gwanjeong Kim, Thiem HoangJihye Hwang, Sheng Yuan Liu, David Berry, Pierre Bastien, Tetsuo Hasegawa, Woojin Kwon, Keping Qiu, Philippe André, Yusuke Aso, Do Young Byun, Huei Ru Chen, Michael C. Chen, Wen Ping Chen, Tao Chung Ching, Jungyeon Cho, Minho Choi, Antonio Chrysostomou, Eun Jung Chung, Simon Coudé, Yasuo Doi, C. Darren Dowell, Emily Drabek-Maunder, Hao Yuan Duan, Stewart P.S. Eyres, Sam Falle, Lapo Fanciullo, Jason Fiege, Erica Franzmann, Per Friberg, Rachel K. Friesen, Gary Fuller, Tim Gledhill, Sarah F. Graves, Jane S. Greaves, Matt J. Griffin, Qilao Gu, Ilseung Han, Jennifer Hatchell, Saeko S. Hayashi, Wayne Holland, Martin Houde, Tsuyoshi Inoue, Shu Ichiro Inutsuka, Kazunari Iwasaki, Il Gyo Jeong, Yoshihiro Kanamori, Ji Hyun Kang, Miju Kang, Sung Ju Kang, Akimasa Kataoka, Koji S. Kawabata, Francisca Kemper, Jongsoo Kim, Kyoung Hee Kim, Mi Ryang Kim, Shinyoung Kim, Jason M. Kirk, Masato I.N. Kobayashi, Vera Konyves, Jungmi Kwon, Kevin M. Lacaille, Hyeseung Lee, Jeong Eun Lee, Sang Sung Lee, Yong Hee Lee, Dalei Li, Di Li, Hua Bai Li, Hong Li Liu, Junhao Liu, A. Ran Lyo, Masafumi Matsumura, Brenda C. Matthews, Gerald H. Moriarty-Schieven, Tetsuya Nagata, Fumitaka Nakamura, Hiroyuki Nakanishi, Nagayoshi Ohashi, Geumsook Park, Harriet Parsons, Enzo Pascale, Nicolas Peretto, Andy Pon, Tae Soo Pyo, Lei Qian, Ramprasad Rao, Mark G. Rawlings, Brendan Retter, John Richer, Andrew Rigby, Jean François Robitaille, Sarah Sadavoy, Hiro Saito, Giorgio Savini, Anna M.M. Scaife, Masumichi Seta, Hiroko Shinnaga, Ya Wen Tang, Kohji Tomisaka, Yusuke Tsukamoto, Sven Van Loo, Hongchi Wang, Anthony P. Whitworth, Hsi Wei Yen, Hyunju Yoo, Jinghua Yuan, Hyeong Sik Yun, Tetsuya Zenko, Chuan Peng Zhang, Guoyin Zhang, Ya Peng Zhang, Jianjun Zhou, Lei Zhu

研究成果: 雜誌貢獻期刊論文同行評審

26 引文 斯高帕斯(Scopus)

摘要

We present the 850 μm polarization observations toward the IC 5146 filamentary cloud taken using the Submillimetre Common-User Bolometer Array 2 (SCUBA-2) and its associated polarimeter (POL-2), mounted on the James Clerk Maxwell Telescope, as part of the B-fields In STar forming Regions Observations. This work is aimed at revealing the magnetic field morphology within a core-scale (≲1.0 pc) hub-filament structure (HFS) located at the end of a parsec-scale filament. To investigate whether the observed polarization traces the magnetic field in the HFS, we analyze the dependence between the observed polarization fraction and total intensity using a Bayesian approach with the polarization fraction described by the Rice likelihood function, which can correctly describe the probability density function of the observed polarization fraction for low signal-to-noise ratio data. We find a power-law dependence between the polarization fraction and total intensity with an index of 0.56 in A V ∼ 20-300 mag regions, suggesting that the dust grains in these dense regions can still be aligned with magnetic fields in the IC 5146 regions. Our polarization maps reveal a curved magnetic field, possibly dragged by the contraction along the parsec-scale filament. We further obtain a magnetic field strength of 0.5 ±; 0.2 mG toward the central hub using the Davis-Chandrasekhar-Fermi method, corresponding to a mass-to-flux criticality of ∼1.3 ±; 0.4 and an Alfvénic Mach number of <0.6. These results suggest that gravity and magnetic field are currently of comparable importance in the HFS and that turbulence is less important.

原文???core.languages.en_GB???
文章編號42
期刊Astrophysical Journal
876
發行號1
DOIs
出版狀態已出版 - 1 5月 2019

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