The JCMT BISTRO Survey: The Magnetic Field In The Starless Core $ρ$ Ophiuchus C
Creators: name: Liu, Junhao
name: Qiu, Keping
name: Berry, David
name: Di Francesco, James
name: Bastien, Pierre
name: Koch, Patrick M.
name: Furuya, Ray S.
name: Kim, Kee-Tae
name: Coudé, Simon
name: Lee, Chang Won
name: Soam, Archana
name: Eswaraiah, Chakali
name: Li, Di
name: Hwang, Jihye
name: Lyo, A-Ran
name: Pattle, Kate
name: Hasegawa, Tetsuo
name: Kwon, Woojin
name: Lai, Shih-Ping
name: Ward-Thompson, Derek
name: Ching, Tao-Chung
name: Chen, Zhiwei
name: Gu, Qilao
name: Li, Dalei
name: Li, Hua-bai
name: Liu, Hong-Li
name: Qian, Lei
name: Wang, Hongchi
name: Yuan, Jinghua
name: Zhang, Chuan-Peng
name: Zhang, Guoyin
name: Zhang, Ya-Peng
name: Zhou, Jianjun
name: Zhu, Lei
name: André, Philippe
name: Arzoumanian, Doris
name: Aso, Yusuke
name: Byun, Do-Young
name: Chen, Michael Chun-Yuan
name: Chen, Huei-Ru Vivien
name: Chen, Wen Ping
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: Fanciullo, Lapo
name: Fiege, Jason
name: Franzmann, Erica
name: Friberg, Per
name: Friesen, Rachel K.
name: Fuller, Gary
name: Gledhill, Tim
name: Graves, Sarah F.
name: Greaves, Jane S.
name: Griffin, Matt J.
name: Han, Ilseung
name: Hatchell, Jennifer
name: Hayashi, Saeko S.
name: Hoang, Thiem
name: Holland, Wayne
name: Houde, Martin
name: Inoue, Tsuyoshi
name: Inutsuka, Shu-ichiro
name: Iwasaki, Kazunari
name: Jeong, Il-Gyo
name: Johnstone, Doug
name: Kanamori, Yoshihiro
name: Kang, Ji-hyun
name: Kang, Miju
name: Kang, Sung-ju
name: Kataoka, Akimasa
name: Kawabata, Koji S.
name: Kemper, Francisca
name: Kim, Gwanjeong
name: Kim, Jongsoo
name: Kim, Kyoung Hee
name: Kim, Mi-Ryang
name: Kim, Shinyoung
name: Kirk, Jason M.
name: Kobayashi, Masato I. N.
name: Kusune, Takayoshi
name: Kwon, Jungmi
name: Lacaille, Kevin M.
name: Lee, Chin-Fei
name: Lee, Jeong-Eun
name: Lee, Hyeseung
name: Lee, Sang-Sung
name: Liu, Sheng-Yuan
name: Liu, Tie
name: van Loo, Sven
name: Mairs, Steve
name: Matsumura, Masafumi
name: Matthews, Brenda C.
name: Moriarty-Schieven, Gerald H.
name: Nagata, Tetsuya
name: Nakamura, Fumitaka
name: Nakanishi, Hiroyuki
name: Ohashi, Nagayoshi
name: Onaka, Takashi
name: Parker, Josh
name: Parsons, Harriet
name: Pascale, Enzo
name: Peretto, Nicolas
name: Pon, Andy
name: Pyo, Tae-Soo
name: Rao, Ramprasad
name: Rawlings, Mark G.
name: Retter, Brendan
name: Richer, John
name: Rigby, Andrew
name: Robitaille, Jean-François
name: Sadavoy, Sarah
name: Saito, Hiro
name: Savini, Giorgio
name: Scaife, Anna M. M.
name: Seta, Masumichi
name: Shinnaga, Hiroko
name: Tamura, Motohide
name: Tang, Ya-Wen
name: Tomisaka, Kohji
name: Tsukamoto, Yusuke
name: Wang, Jia-Wei
name: Whitworth, Anthony P.
name: Yen, Hsi-Wei
name: Yoo, Hyunju
name: Zenko, Tetsuya
Publisher: name: arXiv
Year: 2019
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: We report 850~$μ$m dust polarization observations of a low-mass ($\sim$12 $M_{\odot}$) starless core in the $ρ$ Ophiuchus cloud, Ophiuchus C, made with the POL-2 instrument on the James Clerk Maxwell Telescope (JCMT) as part of the JCMT B-fields In STar-forming Region Observations (BISTRO) survey. We detect an ordered magnetic field projected on the plane of sky in the starless core. The magnetic field across the $\sim$0.1~pc core shows a predominant northeast-southwest orientation centering between $\sim$40$^\circ$ to $\sim$100$^\circ$, indicating that the field in the core is well aligned with the magnetic field in lower-density regions of the cloud probed by near-infrared observations and also the cloud-scale magnetic field traced by Planck observations. The polarization percentage ($P$) decreases with an increasing total intensity ($I$) with a power-law index of $-$1.03 $\pm$ 0.05. We estimate the plane-of-sky field strength ($B_{\mathrm{pos}}$) using modified Davis-Chandrasekhar-Fermi (DCF) methods based on structure function (SF), auto-correlation (ACF), and unsharp masking (UM) analyses. We find that the estimates from the SF, ACF, and UM methods yield strengths of 103 $\pm$ 46 $μ$G, 136 $\pm$ 69 $μ$G, and 213 $\pm$ 115 $μ$G, respectively. Our calculations suggest that the Ophiuchus C core is near magnetically critical or slightly magnetically supercritical (i.e. unstable to collapse). The total magnetic energy calculated from the SF method is comparable to the turbulent energy in Ophiuchus C, while the ACF method and the UM method only set upper limits for the total magnetic energy because of large uncertainties.
description: 22 pages, 12 figures