The JCMT BISTRO Survey: The Magnetic Field of the Barnard 1 Star-Forming Region
Coudé, S; Bastien, P; Houde, M; et al.Sadavoy, S; Friesen, R; Di Francesco, J; Johnstone, D; Mairs, S; Hasegawa, T; Kwon, W; Lai, S-P; Qiu, K; Ward-Thompson, D; Berry, D; Chen, MC-Y; Fiege, J; Franzmann, E; Hatchell, J; Lacaille, K; Matthews, BC; Moriarty-Schieven, GH; Pon, A; André, P; Arzoumanian, D; Aso, Y; Byun, D-Y; Chakali, E; Chen, H-R; Chen, WP; Ching, T-C; Cho, J; Choi, M; Chrysostomou, A; Chung, EJ; Doi, Y; Drabek-Maunder, E; Dowell, CD; Eyres, SPS; Falle, S; Friberg, P; Fuller, G; Furuya, RS; Gledhill, T; Graves, SF; Greaves, JS; Griffin, MJ; Gu, Q; Hayashi, SS; Hoang, T; Holland, W; Inoue, T; Inutsuka, S-I; Iwasaki, K; Jeong, I-G; Kanamori, Y; Kataoka, A; Kang, J-H; Kang, M; Kang, S-J; Kawabata, KS; Kemper, F; Kim, G; Kim, J; Kim, K-T; Kim, KH; Kim, M-R; Kim, S; Kirk, JM; Kobayashi, MIN; Koch, PM; Kwon, J; Lee, J-E; Lee, CW; Lee, S-S; Li, D; Li, D; Li, H-B; Liu, H-L; Liu, J; Liu, S-Y; Liu, T; van Loo, S; Lyo, A; Matsumura, M; Nagata, T; Nakamura, F; Nakanishi, H; Ohashi, N; Onaka, T; Parsons, H; Pattle, K; Peretto, N; Pyo, T-S; Qian, L; Rao, R; Rawlings, MG; Retter, B; Richer, J; Rigby, A; Robitaille, J-F; Saito, H; Savini, G; Scaife, AMM; Seta, M; Shinnaga, H; Soam, A; Tamura, M; Tang, Y-W; Tomisaka, K; Tsukamoto, Y; Wang, H; Wang, J-W; Whitworth, AP; Yen, H-W; Yoo, H; Yuan, J; Zenko, T; Zhang, C-P; Zhang, G; Zhou, J; Zhu, L
Date: 29 May 2019
American Astronomical Society / IOP Publishing
We present the POL-2 850 um linear polarization map of the Barnard 1 clump in the Perseus molecular cloud complex from the B-fields In STar-forming Region Observations (BISTRO) survey at the James Clerk Maxwell Telescope. We find a trend of decreasing polarization fraction as a function of total intensity, which we link to depolarization ...
We present the POL-2 850 um linear polarization map of the Barnard 1 clump in the Perseus molecular cloud complex from the B-fields In STar-forming Region Observations (BISTRO) survey at the James Clerk Maxwell Telescope. We find a trend of decreasing polarization fraction as a function of total intensity, which we link to depolarization effects towards higher density regions of the cloud. We then use the polarization data at 850 um to infer the plane-of-sky orientation of the large-scale magnetic field in Barnard 1. This magnetic field runs North-South across most of the cloud, with the exception of B1-c where it turns more East-West. From the dispersion of polarization angles, we calculate a turbulence correlation length of 5.0 +/- 2.5 arcsec (1500 au), and a turbulent-to-total magnetic energy ratio of 0.5 +/- 0.3 inside the cloud. We combine this turbulent-to-total magnetic energy ratio with observations of NH3 molecular lines from the Green Bank Ammonia Survey (GAS) to estimate the strength of the plane-of-sky component of the magnetic field through the Davis-Chandrasekhar-Fermi method. With a plane-of-sky amplitude of 120 +/- 60 uG and a criticality criterion lambda_c = 3.0 +/- 1.5, we find that Barnard 1 is a supercritical molecular cloud with a magnetic field nearly dominated by its turbulent component.
Physics and Astronomy
College of Engineering, Mathematics and Physical Sciences
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