The JCMT BISTRO Survey: An 850/450 μ m Polarization Study of NGC 2071IR in Orion B
Authors
Sadavoy, Sarah
Berry, David
Di Francesco, James
Hasegawa, Tetsuo
Won Lee, Chang
Diep, Pham Ngoc
Fanciullo, Lapo
Whitworth, Anthony
Vivien Chen, Huei-Ru
Chen, Mike
Choi, Minho
Choi, Yunhee
Dai, Sophia
Dowell, C. Darren
Duan, Hao-Yuan
Duan, Yan
Eswaraiah, Chakali
Eyres, Stewart
Fiege, Jason
Fissel, Laura M.
Greaves, Jane
Griffin, Matt
Han, Ilseung
Hayashi, Saeko
Jeong, Il-Gyo
Kim, Kyoung Hee
Li, Dalei
Liu, Hong-Li
Nakanishi, Hiroyuki
Bich Ngoc, Nguyen
Peretto, Nicolas
Priestley, Felix
Retter, Brendan
Saito, Hiro
Scaife, Anna
Seta, Masumichi
Tahani, Mehrnoosh
Tsukamoto, Yusuke
Xie, Jinjin
Yuan, Jinghua
Zenko, Tetsuya
Zhang, Guoyin
Zhang, Yapeng
Zhou, Jianjun
Zhu, Lei
de Looze, Ilse
Falle, Sam
Robitaille, Jean-François
van Loo, Sven
Publication Date
2021-09-14Journal Title
The Astrophysical Journal
ISSN
0004-637X
Publisher
The American Astronomical Society
Volume
918
Issue
2
Language
en
Type
Article
This Version
VoR
Metadata
Show full item recordCitation
Lyo, A., Kim, J., Sadavoy, S., Johnstone, D., Berry, D., Pattle, K., Kwon, W., et al. (2021). The JCMT BISTRO Survey: An 850/450 μ m Polarization Study of NGC 2071IR in Orion B. The Astrophysical Journal, 918 (2) https://doi.org/10.3847/1538-4357/ac0ce9
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.
Keywords
320, Interstellar Matter and the Local Universe
Identifiers
apjac0ce9, ac0ce9, aas29678
External DOI: https://doi.org/10.3847/1538-4357/ac0ce9
This record's URL: https://www.repository.cam.ac.uk/handle/1810/329470
Rights
Licence:
http://creativecommons.org/licenses/by/4.0/
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