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

Jia‐Wei Wang,S. Lai,C. Eswaraiah,K. Pattle,J. Francesco,D. Johnstone,P. Koch,Tie Liu,M. Tamura,R. Furuya,T. Onaka,D. Ward-Thompson,A. Soam,Kee-Tae Kim,C. Lee,Chin-Fei Lee,S. Mairs,D. Arzoumanian,Gwanjeong Kim,Thiem C. Hoang,Jihye Hwang,Sheng-Yuan Liu,D. Berry,P. Bastien,T. Hasegawa,W. Kwon,K. Qiu,P. Andr'e,Yusuke Aso,D. Byun,H. Chen,M. Chen,W. Chen,T. Ching,Jungyeon Cho,Minho Choi,A. Chrysostomou,E. Chung,Simon Coud'e,Y. Doi,C. Dowell,E. Drabek-Maunder,H. Duan,S. Eyres,S. Falle,L. Fanciullo,J. Fiege,E. Franzmann,P. Friberg,R. Friesen,G. Fuller,T. Gledhill,S. Graves,J. Greaves,M. Griffin,Q. Gu,I. Han,J. Hatchell,S. Hayashi,W. Holland,M. Houde,T. Inoue,S. Inutsuka,K. Iwasaki,Il-Gyo Jeong,Yoshihiro Kanamori,Ji-hyun Kang,Miju Kang,Sung-ju Kang,A. Kataoka,K. Kawabata,F. Kemper,Jongsoo Kim,K. Kim,Mi-Ryang Kim,Shinyoung Kim,J. Kirk,Masato I. N. Kobayashi,V. Konyves,J. Kwon,K. Lacaille,Hyeseung Lee,Jeong-Eun Lee,Sang-Sung Lee,Yong-Hee Lee,Dalei Li,Di Li,Hua-b. Li,Hongli Liu,Junhao Liu,A. Lyo,M. Matsumura,B. Matthews,G. Moriarty-Schieven,T. Nagata,F. Nakamura,H. Nakanishi,N. Ohashi,Geumsook Park,H. Parsons,E. Pascale,N. Peretto,A. Pon,T. Pyo,L. Qian,R. Rao,M. Rawlings,B. Retter,J. Richer,A. Rigby,J. Robitaille,S. Sadavoy,H. Saito,G. Savini,A. Scaife,M. Seta,H. Shinnaga,Ya-wen Tang,K. Tomisaka,Y. Tsukamoto,S. Loo,Hongchi Wang,A. Whitworth,Hsi-Wei Yen,H. Yoo,Jinghua Yuan,H. Yun,T. Zenko,Chuan-peng Zhang,Guoyin Zhang,Yapeng Zhang,Jianjun Zhou,Zhu

Published 2018 in Astrophysical Journal

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 AV ∼ 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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