The JCMT BISTRO Survey: Studying the Complex Magnetic Field of L43
Authors: Karoly Janik , Ward-Thompson Derek , Pattle Kate , Berry David , Whitworth Anthony , Kirk Jason , Bastien Pierre , Ching Tao-Chung , Coudé Simon , Hwang Jihye , Kwon Woojin , Soam Archana , Wang Jia-Wei , Hasegawa Tetsuo , Lai Shih-Ping , Qiu Keping , Arzoumanian Doris , Bourke Tyler L. , Byun Do-Young , Chen Huei-Ru Vivien , Chen Wen Ping , Chen Mike , Chen Zhiwei , Cho Jungyeon , Choi Minho , Choi Youngwoo , Choi Yunhee , Chrysostomou Antonio , Chung Eun Jung , Dai Sophia , Debattista Victor , Di Francesco James , Diep Pham Ngoc , Doi Yasuo , Duan Hao-Yuan , Duan Yan , Eswaraiah Chakali , Fanciullo Lapo , Fiege Jason , Fissel Laura M. , Franzmann Erica , Friberg Per , Friesen Rachel , Fuller Gary , Furuya Ray , Gledhill Tim , Graves Sarah , Greaves Jane , Griffin Matt , Gu Qilao , Han Ilseung , Hoang Thiem , Houde Martin , Hull Charles L. H. , Inoue Tsuyoshi , Inutsuka Shu-ichiro , Iwasaki Kazunari , Jeong Il-Gyo , Johnstone Doug , Könyves Vera , Kang Ji-hyun , Kang Miju , Kataoka Akimasa , Kawabata Koji , Kemper Francisca , Kim Jongsoo , Kim Shinyoung , Kim Gwanjeong , Kim Kyoung Hee , Kim Mi-Ryang , Kim Kee-Tae , Kim Hyosung , Kirchschlager Florian , Kobayashi Masato I. N. , Koch Patrick M. , Kusune Takayoshi , Kwon Jungmi , Lacaille Kevin , Law Chi-Yan , Lee Chang Won , Lee Hyeseung , Lee Yong-Hee , Lee Chin-Fei , Lee Jeong-Eun , Lee Sang-Sung , Li Dalei , Li Di , Li Guangxing , Li Hua-bai , Lin Sheng-Jun , Liu Hong-Li , Liu Tie , Liu Sheng-Yuan , Liu Junhao , Longmore Steven , Lu Xing , Lyo A-Ran , Mairs Steve , Matsumura Masafumi , Matthews Brenda , Moriarty-Schieven Gerald , Nagata Tetsuya , Nakamura Fumitaka , Nakanishi Hiroyuki , Ngoc Nguyen Bich , Ohashi Nagayoshi , Onaka Takashi , Park Geumsook , Parsons Harriet , Peretto Nicolas , Priestley Felix , Pyo Tae-Soo , Qian Lei , Rao Ramprasad , Rawlings Jonathan , Rawlings Mark , Retter Brendan , Richer John , Rigby Andrew , Sadavoy Sarah , Saito Hiro , Savini Giorgio , Seta Masumichi , Sharma Ekta , Shimajiri Yoshito , Shinnaga Hiroko , Tahani Mehrnoosh , Tamura Motohide , Tang Ya-Wen , Tang Xindi , Tomisaka Kohji , Tram Le Ngoc , Tsukamoto Yusuke , Viti Serena , Wang Hongchi , Wu Jintai , Xie Jinjin , Yang Meng-Zhe , Yen Hsi-Wei , Yoo Hyunju , Yuan Jinghua , Yun Hyeong-Sik , Zenko Tetsuya , Zhang Guoyin , Zhang Yapeng , Zhang Chuan-Peng , Zhou Jianjun , Zhu Lei , de Looze Ilse , André Philippe , Dowell C. Darren , Eden David , Eyres Stewart , Falle Sam , Le Gouellec Valentin J. M. , Poidevin Frédérick , Robitaille Jean-François , van Loo Sven 
Published: July 2023

Abstract
We present observations of polarized dust emission at 850 μm from the L43 molecular cloud, which sits in the Ophiuchus cloud complex. The data were taken using SCUBA-2/POL-2 on the James Clerk Maxwell Telescope as a part of the BISTRO large program. L43 is a dense (

N

H

2

∼

10

22

–1023 cm−2) complex molecular cloud with a submillimeter-bright starless core and two protostellar sources. There appears to be an evolutionary gradient along the isolated filament that L43 is embedded within, with the most evolved source closest to the Sco OB2 association. One of the protostars drives a CO outflow that has created a cavity to the southeast. We see a magnetic field that appears to be aligned with the cavity walls of the outflow, suggesting interaction with the outflow. We also find a magnetic field strength of up to ∼160 ± 30 μG in the main starless core and up to ∼90 ± 40 μG in the more diffuse, extended region. These field strengths give magnetically super- and subcritical values, respectively, and both are found to be roughly trans-Alfvénic. We also present a new method of data reduction for these denser but fainter objects like starless cores.