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  • A First Look at BISTRO Observations of The \(\rho\) Oph-A core
    Kwon, Jungmi; Doi, Yasuo; Pattle, Kate; Berry, David; Sadavoy, Sarah; Matthews, Brenda C; Ward-Thompson, Derek; Hasegawa, Tetsuo; Furuya, Ray S; Pon, Andy; James Di Francesco; Hayashi, Saeko S; Onaka, Takashi; Choi, Minho; Kang, Miju; Thiem Hoang; Chang Won Lee; Sang-Sung, Lee; Hong-Li, Liu; Liu, Tie; Eswaraiah, Chakali; Bastien, Pierre; Kwon, Woojin; Shih-Ping, Lai; Qiu, Keping; Coude, Simon; Franzmann, Erica; Friberg, Per; Graves, Sarah F; Houde, Martin; Johnstone, Doug; Koch, Patrick M; Parsons, Harriet; Rawlings, Mark; Sven Van Loo; Aso, Yusuke; Do-Young, Byun; Chen, Huei-Ru; Chen, Mike C -Y; Chen, Wen Ping; Cho, Jungyeon; Chrysostomou, Antonio; Drabek-Maunder, Emily; Eyres, Stewart P S; Friesen, Rachel K; Fuller, Gary; Gledhill, Tim; Griffin, Matt J; Hatchell, Jennifer; Inoue, Tsuyoshi; Iwasaki, Kazunari; Il-Gyo Jeong; Ji-Hyun, Kang; Sung-Ju, Kang; Kemper, Francisca; Kim, Gwanjeong; Kim, Jongsoo; Kee-Tae, Kim; Kim, Kyoung Hee; Mi-Ryang, Kim; Kim, Shinyoung; Lacaille, Kevin M; Li, Dalei; Sheng-Yuan, Liu; A-Ran Lyo; Mairs, Steve; Nakanishi, Hiroyuki; Ohashi, Nagayoshi; Peretto, Nicolas; Tae-Soo Pyo; Qian, Lei; Retter, Brendan; Richer, John; Rigby, Andrew; Savini, Giorgio; Scaife, Anna M M; Soam, Archana; Ya-Wen, Tang; Tomisaka, Kohji; Wang, Hongchi; Jia-Wei, Wang; Whitworth, Anthony P; Hsi-Wei Yen; Yoo, Hyunju; Yuan, Jinghua; Zhang, Guoyin; Zhou, Jianjun; Zhu, Lei; Andre, 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

    arXiv.org, 04/2018
    Paper

    We present 850 \(\mu\)m imaging polarimetry data of the \(\rho\) 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, BISTRO (B-fields In STar forming RegiOns). 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 \(\rho\) Oph A core; some of them can be part of a coherent magnetic field structure in the \(\rho\) Oph region. The results are consistent with previous observations of the brightest regions of \(\rho\) Oph-A, where the degrees of polarization are at a level of a few percents, 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 which are consistent at near-infrared and submillimeter wavelengths. Using the Davis-Chandrasekhar-Fermi method, we also derive magnetic field strengths in several sub-core regions, which range from approximately 0.2 to 5 mG. We also find a correlation between the magnetic field orientations projected on the sky with the core centroid velocity components.

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