JCMT BISTRO survey: Magnetic Fields within the Hub-Filament Structure in IC 5146
Creators: name: Wang, Jia-Wei
name: Lai, Shih-Ping
name: Eswaraiah, Chakali
name: Pattle, Kate
name: Di Francesco, James
name: Johnstone, Doug
name: Koch, Patrick M.
name: Liu, Tie
name: Tamura, Motohide
name: Furuya, Ray S.
name: Onaka, Takashi
name: Ward-Thompson, Derek
name: Soam, Archana
name: Kim, Kee-Tae
name: Lee, Chang Won
name: Lee, Chin-Fei
name: Mairs, Steve
name: Arzoumanian, Doris
name: Kim, Gwanjeong
name: Hoang, Thiem
name: Hwang, Jihye
name: Liu, Sheng-Yuan
name: Berry, David
name: Bastien, Pierre
name: Hasegawa, Tetsuo
name: Kwon, Woojin
name: Qiu, Keping
name: André, Philippe
name: Aso, Yusuke
name: Byun, Do-Young
name: Chen, Huei-Ru
name: Chen, Michael C.
name: Chen, Wen Ping
name: Ching, Tao-Chung
name: Cho, Jungyeon
name: Choi, Minho
name: Chrysostomou, Antonio
name: Chung, Eun Jung
name: Coudé, Simon
name: Doi, Yasuo
name: Dowell, C. Darren
name: Drabek-Maunder, Emily
name: Duan, Hao-Yuan
name: Eyres, Stewart P. S.
name: Falle, Sam
name: Fanciullo, Lapo
name: Fiege, Jason
name: Franzmann, Erica
name: Friberg, Per
name: Friesen, Rachel K.
name: Fuller, Gary
name: Gledhill, Tim
name: Graves, Sarah F.
name: Greaves, Jane S.
name: Griffin, Matt J.
name: Gu, Qilao
name: Han, Ilseung
name: Hatchell, Jennifer
name: Hayashi, Saeko S.
name: Holland, Wayne
name: Houde, Martin
name: Inoue, Tsuyoshi
name: Inutsuka, Shu-ichiro
name: Iwasaki, Kazunari
name: Jeong, Il-Gyo
name: Kanamori, Yoshihiro
name: Kang, Ji-hyun
name: Kang, Miju
name: Kang, Sung-ju
name: Kataoka, Akimasa
name: Kawabata, Koji S.
name: Kemper, Francisca
name: Kim, Jongsoo
name: Kim, Kyoung Hee
name: Kim, Mi-Ryang
name: Kim, Shinyoung
name: Kirk, Jason M.
name: Kobayashi, Masato I. N.
name: Konyves, Vera
name: Kwon, Jungmi
name: Lacaille, Kevin M.
name: Lee, Hyeseung
name: Lee, Jeong-Eun
name: Lee, Sang-Sung
name: Lee, Yong-Hee
name: Li, Dalei
name: Li, Di
name: Li, Hua-bai
name: Liu, Hong-Li
name: Liu, Junhao
name: Lyo, A-Ran
name: Matsumura, Masafumi
name: Matthews, Brenda C.
name: Moriarty-Schieven, Gerald H.
name: Nagata, Tetsuya
name: Nakamura, Fumitaka
name: Nakanishi, Hiroyuki
name: Ohashi, Nagayoshi
name: Park, Geumsook
name: Parsons, Harriet
name: Pascale, Enzo
name: Peretto, Nicolas
name: Pon, Andy
name: Pyo, Tae-Soo
name: Qian, Lei
name: Rao, Ramprasad
name: Rawlings, Mark G.
name: Retter, Brendan
name: Richer, John
name: Rigby, Andrew
name: Robitaille, Jean-François
name: Sadavoy, Sarah
name: Saito, Hiro
name: Savini, Giorgio
name: Scaife, Anna M. M.
name: Seta, Masumichi
name: Shinnaga, Hiroko
name: Tang, Ya-Wen
name: Tomisaka, Kohji
name: Tsukamoto, Yusuke
name: van Loo, Sven
name: Wang, Hongchi
name: Whitworth, Anthony P.
name: Yen, Hsi-Wei
name: Yoo, Hyunju
name: Yuan, Jinghua
name: Yun, Hyeong-Sik
name: Zenko, Tetsuya
name: Zhang, Chuan-Peng
name: Zhang, Guoyin
name: Zhang, Ya-Peng
name: Zhou, Jianjun
name: Zhu
Publisher: name: arXiv
Year: 2018
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: We present the 850 $μ$m polarization observations toward the IC5146 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 (JCMT), as part of the B-fields In STar forming Regions Observations (BISTRO). This work is aimed at revealing the magnetic field morphology within a core-scale ($\lesssim 1.0$ pc) hub-filament structure (HFS) located at the end of a parsec-scale filament. To investigate whether or not 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 (PDF) of the observed polarization fraction for low signal-to-noise ratio (SNR) data. We find a power-law dependence between the polarization fraction and total intensity with an index of 0.56 in $A_V\sim$ 20--300 mag regions, suggesting that the dust grains in these dense regions can still be aligned with magnetic fields in the IC5146 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$\pm$0.2 mG toward the central hub using the Davis-Chandrasekhar-Fermi method, corresponding to a mass-to-flux criticality of $\sim$ $1.3\pm0.4$ and an Alfvénic Mach number of $
description: 24 pages, 15 figures, accepted for publication in ApJ