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

Simon Coudé Pierre Bastien Martin Houde Sarah Sadavoy Rachel Friesen James Di Francesco Doug Johnstone Steve Mairs Tetsuo Hasegawa Woojin Kwon Shih-Ping Lai Keping Qiu Derek Ward-Thompson David Berry Michael Chun-Yuan Chen Jason Fiege Erica Franzmann Jennifer Hatchell Kevin Lacaille Brenda C. Matthews Gerald H. Moriarty-Schieven Andy Pon Philippe André Doris Arzoumanian Yusuke Aso Do-Young Byun Chakali Eswaraiah Huei-Ru Chen Wen Ping Chen Tao-Chung Ching Jungyeon Cho Minho Choi Antonio Chrysostomou Eun Jung Chung Yasuo Doi Emily Drabek-Maunder C. Darren Dowell Stewart P. S. Eyres Sam Falle Per Friberg Gary Fuller Ray S. Furuya Tim Gledhill Sarah F. Graves Jane S. Greaves Matt J. Griffin Qilao Gu Saeko S. Hayashi Thiem Hoang Wayne Holland Tsuyoshi Inoue Shu-Ichiro Inutsuka Kazunari Iwasaki Il-Gyo Jeong Yoshihiro Kanamori Akimasa Kataoka Ji-Hyun Kang Miju Kang Sung-Ju Kang Koji S. Kawabata Francisca Kemper Gwanjeong Kim Jongsoo Kim Kee-Tae Kim Kyoung Hee Kim Mi-Ryang Kim Shinyoung Kim Jason M. Kirk Masato I. N. Kobayashi Patrick M. Koch Jungmi Kwon Jeong-Eun Lee Chang Won Lee Sang-Sung Lee Dalei Li Di Li Hua-Bai Li Hong-Li Liu Junhao Liu Sheng-Yuan Liu Tie Liu Sven van Loo A. -Ran Lyo Masafumi Matsumura Tetsuya Nagata Fumitaka Nakamura Hiroyuki Nakanishi Nagayoshi Ohashi Takashi Onaka Harriet Parsons Kate Pattle Nicolas Peretto Tae-Soo Pyo Lei Qian Ramprasad Rao Mark G. Rawlings Brendan Retter John Richer Andrew Rigby Jean-François Robitaille 1 Hiro Saito Giorgio Savini Anna M. M. Scaife Masumichi Seta Hiroko Shinnaga Archana Soam Motohide Tamura Ya-Wen Tang Kohji Tomisaka Yusuke Tsukamoto Hongchi Wang Jia-Wei Wang Anthony P. Whitworth Hsi-Wei Yen Hyunju Yoo Jinghua Yuan Tetsuya Zenko Chuan-Peng Zhang Guoyin Zhang Jianjun Zhou Lei Zhu 
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 ± 2.″5 (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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Submitted on : Friday, June 24, 2022 - 1:20:06 PM
Last modification on : Saturday, June 25, 2022 - 9:30:03 AM

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Simon Coudé, Pierre Bastien, Martin Houde, Sarah Sadavoy, Rachel Friesen, et al.. The JCMT BISTRO Survey: The Magnetic Field of the Barnard 1 Star-forming Region. The Astrophysical Journal, 2019, 877, ⟨10.3847/1538-4357/ab1b23⟩. ⟨insu-03703855⟩

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