Wang, J-W; Lai, S-P; Eswaraiah, C; Pattle, K; Di Francesco, J; Johnstone, D; Koch, PM; ... Zhu, L; + view all Wang, J-W; Lai, S-P; Eswaraiah, C; Pattle, K; Di Francesco, J; Johnstone, D; Koch, PM; Liu, T; Tamura, M; Furuya, RS; Onaka, T; Ward-Thompson, D; Soam, A; Kim, K-T; Lee, CW; Lee, C-F; Mairs, S; Arzoumanian, D; Kim, G; Hoang, T; Hwang, J; Liu, S-Y; Berry, D; Bastien, P; Hasegawa, T; Kwon, W; Qiu, K; Andre, P; Aso, Y; Byun, D-Y; Chen, H-R; Chen, MC; Chen, WP; Ching, T-C; Cho, J; Choi, M; Chrysostomou, A; Chung, EJ; Coude, S; Doi, Y; Dowell, CD; Drabek-Maunder, E; Duan, H-Y; Eyres, SPS; Falle, S; Fanciullo, L; Fiege, J; Franzmann, E; Friberg, P; Friesen, RK; Fuller, G; Gledhill, T; Graves, SF; Greaves, JS; Griffin, MJ; Gu, Q; Han, I; Hatchell, J; Hayashi, SS; Holland, W; Houde, M; Inoue, T; Inutsuka, S-I; Iwasaki, K; Jeong, I-G; Kanamori, Y; Kang, J-H; Kang, M; Kang, S-J; Kataoka, A; Kawabata, KS; Kemper, F; Kim, J; Kim, KH; Kim, M-R; Kim, S; Kirk, JM; Kobayashi, MIN; Konyves, V; Kwon, J; Lacaille, KM; Lee, H; Lee, J-E; Lee, S-S; Lee, Y-H; Li, D; Li, D; Li, H-B; Liu, H-L; Liu, J; Lyo, A-R; Matsumura, M; Matthews, BC; Moriarty-Schieven, GH; Nagata, T; Nakamura, F; Nakanishi, H; Ohashi, N; Park, G; Parsons, H; Pascale, E; Peretto, N; Pon, A; Pyo, T-S; Qian, L; Rao, R; Rawlings, MG; Retter, B; Richer, J; Rigby, A; Robitaille, J-F; Sadavoy, S; Saito, H; Savini, G; Scaife, AMM; Seta, M; Shinnaga, H; Tang, Y-W; Tomisaka, K; Tsukamoto, Y; Van Loo, S; Wang, H; Whitworth, AP; Yen, H-W; Yoo, H; Yuan, J; Yun, H-S; Zenko, T; Zhang, C-P; Zhang, G; Zhang, Y-P; Zhou, J; Zhu, L; - view fewer (2019) JCMT BISTRO Survey: Magnetic Fields within the Hub-filament Structure in IC 5146. The Astrophysical Journal , 876 (1) , Article 42. 10.3847/1538-4357/ab13a2.

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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 (lesssim1.0 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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