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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 Hoang Jihye 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 1 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 
Abstract : 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.
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Submitted on : Friday, June 24, 2022 - 1:38:07 PM
Last modification on : Saturday, June 25, 2022 - 9:30:02 AM

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Jia-Wei Wang, Shih-Ping Lai, Chakali Eswaraiah, Kate Pattle, James Di Francesco, et al.. JCMT BISTRO Survey: Magnetic Fields within the Hub-filament Structure in IC 5146. The Astrophysical Journal, 2019, 876, ⟨10.3847/1538-4357/ab13a2⟩. ⟨insu-03703878⟩

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