A First Look at BISTRO Observations of The $\rho$ Oph-A core
Abstract
We present 850 m imaging polarimetry data of the 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 Oph A core; some of them can be part of a coherent magnetic field structure in the Oph region. The results are consistent with previous observations of the brightest regions of 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 (). 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.
Keywords
Cite
@article{arxiv.1804.09313,
title = {A First Look at BISTRO Observations of The $\rho$ Oph-A core},
author = {Jungmi Kwon and Yasuo Doi and Motohide Tamura and Masafumi Matsumura and Kate Pattle and David Berry and Sarah Sadavoy and Brenda C. Matthews and Derek Ward-Thompson and Tetsuo Hasegawa and Ray S. Furuya and Andy Pon and James Di Francesco and Doris Arzoumanian and Saeko S. Hayashi and Koji S. Kawabata and Takashi Onaka and Minho Choi and Miju Kang and Thiem Hoang and Chang Won Lee and Sang-Sung Lee and Hong-Li Liu and Tie Liu and Shu-Ichiro Inutsuka and Chakali Eswaraiah and Pierre Bastien and Woojin Kwon and Shih-Ping Lai and Keping Qiu and Simon Coude and Erica Franzmann and Per Friberg and Sarah F. Graves and Jane S. Greaves and Martin Houde and Doug Johnstone and Jason M. Kirk and Patrick M. Koch and Di Li and Harriet Parsons and Ramprasad Rao and Mark Rawlings and Hiroko Shinnaga and Sven Van Loo and Yusuke Aso and Do-Young Byun and Huei-Ru Chen and Mike C. -Y. Chen and Wen Ping Chen and Tao-Chung Ching and Jungyeon Cho and Antonio Chrysostomou and Eun Jung Chung and Emily Drabek-Maunder and Stewart P. S. Eyres and Jason Fiege and Rachel K. Friesen and Gary Fuller and Tim Gledhill and Matt J. Griffin and Qilao Gu and Jennifer Hatchell and Wayne Holland and Tsuyoshi Inoue and Kazunari Iwasaki and Il-Gyo Jeong and Ji-Hyun Kang and Sung-Ju Kang and Francisca Kemper and Gwanjeong Kim and Jongsoo Kim and Kee-Tae Kim and Kyoung Hee Kim and Mi-Ryang Kim and Shinyoung Kim and Kevin M. Lacaille and Jeong-Eun Lee and Dalei Li and Hua-Bai Li and Junhao Liu and Sheng-Yuan Liu and A-Ran Lyo and Steve Mairs and Gerald H. Moriarty-Schieven and Fumitaka Nakamura and Hiroyuki Nakanishi and Nagayoshi Ohashi and Nicolas Peretto and Tae-Soo Pyo and Lei Qian and Brendan Retter and John Richer and Andrew Rigby and Jean-Franois Robitaille and Giorgio Savini and Anna M. M. Scaife and Archana Soam and Ya-Wen Tang and Kohji Tomisaka and Hongchi Wang and Jia-Wei Wang and Anthony P. Whitworth and Hsi-Wei Yen and Hyunju Yoo and Jinghua Yuan and Chuan-Peng Zhang and Guoyin Zhang and Jianjun Zhou and Lei Zhu and Philippe Andre and C. Darren Dowell and Sam Falle and Yusuke Tsukamoto and Takao Nakagawa and Yoshihiro Kanamori and Akimasa Kataoka and Masato I. N. Kobayashi and Tetsuya Nagata and Hiro Saito and Masumichi Seta and Tetsuya Zenko},
journal= {arXiv preprint arXiv:1804.09313},
year = {2018}
}
Comments
22 pages, 11 figures, accepted for publication in ApJ