The JCMT BISTRO Survey: The Magnetic Field of the Barnard 1 Star-forming Region

Abstract

We present the POL-2 850 μm linear polarization map of the Barnard 1 clump in the Perseus molecular cloud complex from the B-fields In STar-forming Region Observations 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 toward higher-density regions of the cloud. We then use the polarization data at 850 μm 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 ± 2farcs5 (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 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 μG and a criticality criterion λ 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.

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Item Type:	Article
Authors/Creators:	Coude, S Bastien, P Houde, M 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 Andre, P Arzoumanian, D Aso, Y Byun, D-Y Eswaraiah, C 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 https://orcid.org/0000-0003-4746-8500 Lyo, A-R 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 The BISTRO Collaboration
Copyright, Publisher and Additional Information:	(c) 2019, The American Astronomical Society. All rights reserved. This is the published version of an article published in the Astrophysical Journal. Uploaded in accordance with the publisher's self-archiving policy.
Keywords:	ISM: clouds; ISM: individual objects (Barnard 1); ISM: magnetic fields; polarization; stars: formation; submillimeter: ISM
Dates:	Published: 1 June 2019 Published (online): 29 May 2019 Accepted: 18 April 2019
Institution:	The University of Leeds
Academic Units:	The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Physics and Astronomy (Leeds) > Astrophysics (Leeds)
Depositing User:	Symplectic Publications
Date Deposited:	03 Jul 2019 11:25
Last Modified:	03 Jul 2019 11:34
Status:	Published
Publisher:	American Astronomical Society
Identification Number:	10.3847/1538-4357/ab1b23
Related URLs:	Author
Open Archives Initiative ID (OAI ID):	oai:eprints.whiterose.ac.uk:147702

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The JCMT BISTRO Survey: The Magnetic Field of the Barnard 1 Star-forming Region

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