The JCMT BISTRO Survey: An 850/450 μm Polarization Study of NGC 2071IR in Orion B
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Published:2021-09-01
Issue:2
Volume:918
Page:85
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ISSN:0004-637X
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Container-title:The Astrophysical Journal
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language:
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Short-container-title:ApJ
Author:
Lyo A-RanORCID, Kim JongsooORCID, Sadavoy Sarah, Johnstone DougORCID, Berry David, Pattle KateORCID, Kwon WoojinORCID, Bastien PierreORCID, Onaka TakashiORCID, Di Francesco James, Kang Ji-HyunORCID, Furuya RayORCID, Hull Charles L. H.ORCID, Tamura MotohideORCID, Koch Patrick M.ORCID, Ward-Thompson DerekORCID, Hasegawa Tetsuo, Hoang ThiemORCID, Arzoumanian DorisORCID, Won Lee Chang, Lee Chin-FeiORCID, Byun Do-YoungORCID, Kirchschlager FlorianORCID, Doi YasuoORCID, Kim Kee-TaeORCID, Hwang JihyeORCID, Diep Pham Ngoc, Fanciullo Lapo, Lee Sang-SungORCID, Park GeumsookORCID, Yoo HyunjuORCID, Chung Eun JungORCID, Whitworth Anthony, Mairs SteveORCID, Soam ArchanaORCID, Liu TieORCID, Tang XindiORCID, Coudé SimonORCID, André PhilippeORCID, Bourke Tyler L.ORCID, Vivien Chen Huei-Ru, Chen ZhiweiORCID, Ping Chen WenORCID, Chen Mike, Ching Tao-ChungORCID, Cho JungyeonORCID, Choi Minho, Choi Yunhee, Chrysostomou AntonioORCID, Dai Sophia, Dowell C. Darren, Duan Hao-Yuan, Duan Yan, Eden DavidORCID, Eswaraiah Chakali, Eyres Stewart, Fiege Jason, Fissel Laura M., Franzmann EricaORCID, Friberg PerORCID, Friesen RachelORCID, Fuller GaryORCID, Gledhill TimORCID, Graves SarahORCID, Greaves Jane, Griffin Matt, Gu QilaoORCID, Han Ilseung, Hatchell JanniferORCID, Hayashi Saeko, Houde MartinORCID, Inoue TsuyoshiORCID, Inutsuka Shu-ichiroORCID, Iwasaki KazunariORCID, Jeong Il-Gyo, Kang MijuORCID, Kataoka AkimasaORCID, Kawabata KojiORCID, Kemper FranciscaORCID, Kim GwanjeongORCID, Kim Mi-RyangORCID, Kim ShinyoungORCID, Kim Kyoung Hee, Kirk JasonORCID, Kobayashi Masato I. N.ORCID, Könyves VeraORCID, Kusune TakayoshiORCID, Kwon JungmiORCID, Lacaille KevinORCID, Lai Shih-PingORCID, Law Chi-YanORCID, Lee Jeong-EunORCID, Lee Yong-HeeORCID, Lee HyeseungORCID, Li Dalei, Li DiORCID, Li Hua-BaiORCID, Liu Hong-Li, Liu JunhaoORCID, Liu Sheng-YuanORCID, Lu XingORCID, Matsumura MasafumiORCID, Matthews BrendaORCID, Moriarty-Schieven GeraldORCID, Nagata TetsuyaORCID, Nakamura FumitakaORCID, Nakanishi Hiroyuki, Bich Ngoc Nguyen, Ohashi NagayoshiORCID, Parsons HarrietORCID, Peretto Nicolas, Priestley Felix, Pyo Tae-sooORCID, Qian LeiORCID, Qiu KepingORCID, Rao RamprasadORCID, Rawlings JonathanORCID, Rawlings Mark G.ORCID, Retter Brendan, Richer JohnORCID, Rigby AndrewORCID, Saito Hiro, Savini GiorgioORCID, Scaife Anna, Seta Masumichi, Shimajiri YoshitoORCID, Shinnaga HirokoORCID, Tahani Mehrnoosh, Tang Ya-WenORCID, Tomisaka KohjiORCID, Tram Le NgocORCID, Tsukamoto Yusuke, Viti SerenaORCID, Wang Jia-WeiORCID, Wang HongchiORCID, Xie Jinjin, Yen Hsi-WeiORCID, Yuan Jinghua, Yun Hyeong-SikORCID, Zenko Tetsuya, Zhang Guoyin, Zhang Chuan-PengORCID, Zhang Yapeng, Zhou Jianjun, Zhu Lei, de Looze Ilse, Dowell C. Darren, Falle Sam, Robitaille Jean-François, van Loo Sven
Abstract
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.
Publisher
American Astronomical Society
Subject
Space and Planetary Science,Astronomy and Astrophysics
Cited by
17 articles.
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