The JCMT BISTRO Survey: The Magnetic Field of the Barnard 1 Star-Forming Region
Creators: name: Coudé, Simon
name: Bastien, Pierre
name: Houde, Martin
name: Sadavoy, Sarah
name: Friesen, Rachel
name: Di Francesco, James
name: Johnstone, Doug
name: Mairs, Steve
name: Hasegawa, Tetsuo
name: Kwon, Woojin
name: Lai, Shih-Ping
name: Qiu, Keping
name: Ward-Thompson, Derek
name: Berry, David
name: Chen, Michael Chun-Yuan
name: Fiege, Jason
name: Franzmann, Erica
name: Hatchell, Jennifer
name: Lacaille, Kevin
name: Matthews, Brenda C.
name: Moriarty-Schieven, Gerald H.
name: Pon, Andy
name: André, Philippe
name: Arzoumanian, Doris
name: Aso, Yusuke
name: Byun, Do-Young
name: Chakali, Eswaraiah
name: Chen, Huei-Ru
name: Chen, Wen Ping
name: Ching, Tao-Chung
name: Cho, Jungyeon
name: Choi, Minho
name: Chrysostomou, Antonio
name: Chung, Eun Jung
name: Doi, Yasuo
name: Drabek-Maunder, Emily
name: Dowell, C. Darren
name: Eyres, Stewart P. S.
name: Falle, Sam
name: Friberg, Per
name: Fuller, Gary
name: Furuya, Ray S.
name: Gledhill, Tim
name: Graves, Sarah F.
name: Greaves, Jane S.
name: Griffin, Matt J.
name: Gu, Qilao
name: Hayashi, Saeko S.
name: Hoang, Thiem
name: Holland, Wayne
name: Inoue, Tsuyoshi
name: Inutsuka, Shu-ichiro
name: Iwasaki, Kazunari
name: Jeong, Il-Gyo
name: Kanamori, Yoshihiro
name: Kataoka, Akimasa
name: Kang, Ji-hyun
name: Kang, Miju
name: Kang, Sung-ju
name: Kawabata, Koji S.
name: Kemper, Francisca
name: Kim, Gwanjeong
name: Kim, Jongsoo
name: Kim, Kee-Tae
name: Kim, Kyoung Hee
name: Kim, Mi-Ryang
name: Kim, Shinyoung
name: Kirk, Jason M.
name: Kobayashi, Masato I. N.
name: Koch, Patrick M.
name: Kwon, Jungmi
name: Lee, Jeong-Eun
name: Lee, Chang Won
name: Lee, Sang-Sung
name: Li, Dalei
name: Li, Di
name: Li, Hua-bai
name: Liu, Hong-Li
name: Liu, Junhao
name: Liu, Sheng-Yuan
name: Liu, Tie
name: van Loo, Sven
name: Lyo, A-Ran
name: Matsumura, Masafumi
name: Nagata, Tetsuya
name: Nakamura, Fumitaka
name: Nakanishi, Hiroyuki
name: Ohashi, Nagayoshi
name: Onaka, Takashi
name: Parsons, Harriet
name: Pattle, Kate
name: Peretto, Nicolas
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: Saito, Hiro
name: Savini, Giorgio
name: Scaife, Anna M. M.
name: Seta, Masumichi
name: Shinnaga, Hiroko
name: Soam, Archana
name: Tamura, Motohide
name: Tang, Ya-Wen
name: Tomisaka, Kohji
name: Tsukamoto, Yusuke
name: Wang, Hongchi
name: Wang, Jia-Wei
name: Whitworth, Anthony P.
name: Yen, Hsi-Wei
name: Yoo, Hyunju
name: Yuan, Jinghua
name: Zenko, Tetsuya
name: Zhang, Chuan-Peng
name: Zhang, Guoyin
name: Zhou, Jianjun
name: Zhu, Lei
Publisher: name: arXiv
Year: 2019
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: We present the POL-2 850 $μ$m 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 $μ$m 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 $5.0 \pm 2.5$ arcsec ($1500$ au), and a turbulent-to-total magnetic energy ratio of $0.5 \pm 0.3$ inside the cloud. We combine this turbulent-to-total magnetic energy ratio with observations of NH$_3$ 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 $120 \pm 60$ $μ$G and a criticality criterion $λ_c = 3.0 \pm 1.5$, we find that Barnard 1 is a supercritical molecular cloud with a magnetic field nearly dominated by its turbulent component.
description: 22 pages, 7 figures, accepted in the Astrophysical Journal