A First Look at BISTRO Observations of the ρ Oph-A core
Authors: Kwon Jungmi , Doi Yasuo , Tamura Motohide , Matsumura Masafumi , Pattle Kate , Berry David , Sadavoy Sarah , Matthews Brenda C. , Ward-Thompson Derek , Hasegawa Tetsuo , Furuya Ray S. , Pon Andy , Francesco James Di , Arzoumanian Doris , Hayashi Saeko S. , Kawabata Koji S. , Onaka Takashi , Choi Minho , Kang Miju , Hoang Thiem , Lee Chang Won , Lee Sang-Sung , Liu Hong-Li , Liu Tie , Inutsuka Shu-ichiro , Eswaraiah Chakali , Bastien Pierre , Kwon Woojin , Lai Shih-Ping , Qiu Keping , Coudé Simon , Franzmann Erica , Friberg Per , Graves Sarah F. , Greaves Jane S. , Houde Martin , Johnstone Doug , Kirk Jason M. , Koch Patrick M. , Li Di , Parsons Harriet , Rao Ramprasad , Rawlings Mark G. , Shinnaga Hiroko , Loo Sven van , Aso Yusuke , Byun Do-Young , Chen Huei-Ru , Chen Mike C.-Y. , Chen Wen Ping , Ching Tao-Chung , Cho Jungyeon , Chrysostomou Antonio , Chung Eun Jung , Drabek-Maunder Emily , Eyres Stewart P. S. , Fiege Jason , Friesen Rachel K. , Fuller Gary , Gledhill Tim , Griffin Matt J. , Gu Qilao , Hatchell Jennifer , Holland Wayne , Inoue Tsuyoshi , Iwasaki Kazunari , Jeong Il-Gyo , Kang Ji-hyun , Kang Sung-ju , Kemper Francisca , Kim Gwanjeong , Kim Jongsoo , Kim Kee-Tae , Kim Kyoung Hee , Kim Mi-Ryang , Kim Shinyoung , Lacaille Kevin M. , Lee Jeong-Eun , Li Dalei , Li Hua-bai , Liu Junhao , Liu Sheng-Yuan , Lyo A-Ran , Mairs Steve , Moriarty-Schieven Gerald H. , Nakamura Fumitaka , Nakanishi Hiroyuki , Ohashi Nagayoshi , Peretto Nicolas , Pyo Tae-Soo , Qian Lei , Retter Brendan , Richer John , Rigby Andrew , Robitaille Jean-Franois , Savini Giorgio , Scaife Anna M. M. , Soam Archana , Tang Ya-Wen , Tomisaka Kohji , Wang Hongchi , Wang Jia-Wei , Whitworth Anthony P. , Yen Hsi-Wei , Yoo Hyunju , Yuan Jinghua , Zhang Chuan-Peng , Zhang Guoyin , Zhou Jianjun , Zhu Lei , André Philippe , Dowell C. Darren , Falle Sam , Tsukamoto Yusuke , Nakagawa Takao , Kanamori Yoshihiro , Kataoka Akimasa , Kobayashi Masato I. N. , Nagata Tetsuya , Saito Hiro , Seta Masumichi , Zenko Tetsuya 
Published: May 2018

We present 850 μm imaging polarimetry data of the ρ Oph-A core taken with the Submillimeter Common-User Bolometer Array-2 (SCUBA-2) and its polarimeter (POL-2) as part of our ongoing survey project,

-fields In STar forming RegiOns (BISTRO). The polarization vectors are used to identify the orientation of the magnetic field projected on the plane of the sky at a resolution of 0.01 pc. We identify 10 subregions with distinct polarization fractions and angles in the 0.2 pc ρ Oph-A core; some of them can be part of a coherent magnetic field structure in the ρ Oph region. The results are consistent with previous observations of the brightest regions of ρ Oph-A, where the degrees of polarization are at a level of a few percent, but our data reveal for the first time the magnetic field structures in the fainter regions surrounding the core where the degree of polarization is much higher (>5%). A comparison with previous near-infrared polarimetric data shows that there are several magnetic field components that are consistent at near-infrared and submillimeter wavelengths. Using the Davis–Chandrasekhar–Fermi method, we also derive magnetic field strengths in several subcore regions, which range from approximately 0.2 to 5 mG. We also find a correlation between the magnetic field orientations projected on the sky and the core centroid velocity components.