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The JCMT BISTRO Survey: An 850/450 μm Polarization Study of NGC 2071IR in Orion B

A. -Ran Lyo Jongsoo Kim Sarah Sadavoy Doug Johnstone David Berry Kate Pattle Woojin Kwon Pierre Bastien Takashi Onaka James Di Francesco Ji-Hyun Kang Ray Furuya Charles L. H. Hull Motohide Tamura Patrick M. Koch Derek Ward-Thompson Tetsuo Hasegawa Thiem Hoang Doris Arzoumanian Chang Won Lee Chin-Fei Lee Do-Young Byun Florian Kirchschlager Yasuo Doi Kee-Tae Kim Jihye Hwang Pham Ngoc Diep Lapo Fanciullo Sang-Sung Lee Geumsook Park Hyunju Yoo Eun Jung Chung Anthony Whitworth Steve Mairs Archana Soam Tie Liu Xindi Tang Simon Coudé Philippe André Tyler L. Bourke Huei-Ru Vivien Chen Zhiwei Chen Wen Ping Chen Mike Chen Tao-Chung Ching Jungyeon Cho Minho Choi Yunhee Choi Antonio Chrysostomou Sophia Dai C. Darren Dowell Hao-Yuan Duan Yan Duan David Eden Chakali Eswaraiah Stewart Eyres Jason Fiege Laura M. Fissel Erica Franzmann Per Friberg Rachel Friesen Gary Fuller Tim Gledhill Sarah Graves Jane Greaves Matt Griffin Qilao Gu Ilseung Han Jannifer Hatchell Saeko Hayashi Martin Houde Tsuyoshi Inoue Shu-Ichiro Inutsuka Kazunari Iwasaki Il-Gyo Jeong Miju Kang Akimasa Kataoka Koji Kawabata Francisca Kemper Gwanjeong Kim Mi-Ryang Kim Shinyoung Kim Kyoung Hee Kim Jason Kirk Masato I. N. Kobayashi Vera Könyves Takayoshi Kusune Jungmi Kwon Kevin Lacaille Shih-Ping Lai Chi-Yan Law Jeong-Eun Lee Yong-Hee Lee Hyeseung Lee Dalei Li Di Li Hua-Bai Li Hong-Li Liu Junhao Liu Sheng-Yuan Liu Xing Lu Masafumi Matsumura Brenda Matthews Gerald Moriarty-Schieven Tetsuya Nagata Fumitaka Nakamura Hiroyuki Nakanishi Nguyen Bich Ngoc Nagayoshi Ohashi Harriet Parsons Nicolas Peretto Felix Priestley Tae-Soo Pyo Lei Qian Keping Qiu Ramprasad Rao Jonathan Rawlings Mark G. Rawlings Brendan Retter John Richer Andrew Rigby Hiro Saito Giorgio Savini Anna Scaife Masumichi Seta Yoshito Shimajiri Hiroko Shinnaga Mehrnoosh Tahani Ya-Wen Tang Kohji Tomisaka Le Ngoc Tram Yusuke Tsukamoto Serena Viti Jia-Wei Wang Hongchi Wang Jinjin Xie Hsi-Wei Yen Jinghua Yuan Hyeong-Sik Yun Tetsuya Zenko Guoyin Zhang Chuan-Peng Zhang Yapeng Zhang Jianjun Zhou Lei Zhu Ilse de Looze C. Darren Dowell Sam Falle Jean-François Robitaille 1 Sven van Loo 
Abstract : We present the results of simultaneous 450 μm and 850 μm polarization observations toward the massive star-forming region NGC 2071IR, a target of the BISTRO (B-fields in STar-forming Region Observations) Survey, using the POL-2 polarimeter and SCUBA-2 camera mounted on the James Clerk Maxwell Telescope. We find a pinched magnetic field morphology in the central dense core region, which could be due to a rotating toroidal disklike structure and a bipolar outflow originating from the central young stellar object IRS 3. Using the modified Davis-Chandrasekhar-Fermi method, we obtain a plane-of-sky magnetic field strength of 563 ± 421 μG in the central ~0.12 pc region from 850 μm polarization data. The corresponding magnetic energy density of 2.04 × 10-8 erg cm-3 is comparable to the turbulent and gravitational energy densities in the region. We find that the magnetic field direction is very well aligned with the whole of the IRS 3 bipolar outflow structure. We find that the median value of polarization fractions is 3.0% at 450 μm in the central 3' region, which is larger than the median value of 1.2% at 850 μm. The trend could be due to the better alignment of warmer dust in the strong radiation environment. We also find that polarization fractions decrease with intensity at both wavelengths, with slopes, determined by fitting a Rician noise model of 0.59 ± 0.03 at 450 μm and 0.36 ± 0.04 at 850 μm, respectively. We think that the shallow slope at 850 μm is due to grain alignment at the center being assisted by strong radiation from the central young stellar objects.
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Submitted on : Monday, June 27, 2022 - 2:08:20 PM
Last modification on : Wednesday, June 29, 2022 - 3:09:34 AM

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A. -Ran Lyo, Jongsoo Kim, Sarah Sadavoy, Doug Johnstone, David Berry, et al.. The JCMT BISTRO Survey: An 850/450 μm Polarization Study of NGC 2071IR in Orion B. The Astrophysical Journal, 2021, 918, ⟨10.3847/1538-4357/ac0ce9⟩. ⟨insu-03705280⟩

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