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The JCMT BISTRO Survey: An 850/450$\mu$m Polarization Study of NGC 2071IR in OrionB

Authors :
Lyo, A-Ran
Kim, Jongsoo
Sadavoy, Sarah
Johnstone, Doug
Berry, David
Pattle, Kate
Kwon, Woojin
Bastien, Pierre
Onaka, Takashi
Di Francesco, James
Kang, Ji-Hyun
Furuya, Ray
Hull, Charles L. H.
Tamura, Motohide
Koch, Patrick M.
Ward-Thompson, Derek
Hasegawa, Tetsuo
Hoang, Thiem
Arzoumanian, Doris
Lee, Chang Won
Lee, Chin-Fei
Byun, Do-Young
Kirchschlager, Florian
Doi, Yasuo
Kim, Kee-Tae
Hwang, Jihye
Diep, Pham Ngoc
Fanciullo, Lapo
Lee, Sang-Sung
Park, Geumsook
Yoo, Hyunju
Chung, Eun Jung
Whitworth, Anthony
Mairs, Steve
Soam, Archana
Liu, Tie
Tang, Xindi
Coudé, Simon
André, Philippe
Bourke, Tyler L.
Chen, Huei-Ru Vivien
Chen, Zhiwei
Chen, Wen Ping
Chen, Mike
Ching, Tao-Chung
Cho, Jungyeon
Choi, Minho
Choi, Yunhee
Chrysostomou, Antonio
Dai, Sophia
Dowell, C. Darren
Duan, Hao-Yuan
Duan, Yan
Eden, David
Eswaraiah, Chakali
Eyres, Stewart
Fiege, Jason
Fisse, Laura M.
Franzmann, Erica
Friberg, Per
Friesen, Rachel
Fuller, Gary
Gledhill, Tim
Graves, Sarah
Greaves, Jane
Griffin, Matt
Gu, Qilao
Han, Ilseung
Hatchell, Jannifer
Hayashi, Saeko
Houde, Martin
Inoue, Tsuyoshi
Inutsuka, Shu-ichiro
Iwasaki, Kazunari
Jeong, Il-Gyo
Kang, Miju
Kataoka, Akimasa
Kawabata, Koji
Kemper, Francisca
Kim, Gwanjeong
Kim, Mi-Ryang
Kim, Shinyoung
Kim, Kyoung Hee
Kirk, Jason
Kobayashi, Masato I. N.
Könyves, Vera
Kusune, Takayoshi
Kwon, Jungmi
Lacaille, Kevin
Lai, Shih-Ping
Law, Chi-Yan
Lee, Jeong-Eun
Lee, Yong-Hee
Lee, Hyeseung
Li, Dalei
Li, Di
Li, Hua-Bai
Liu, Hong-Li
Liu, Junhao
Liu, Sheng-Yuan
Lu, Xing
Matsumura, Masafumi
Matthews, Brenda
Moriarty-Schieven, Gerald
Nagata, Tetsuya
Nakamura, Fumitaka
Nakanishi, Hiroyuki
Ngoc, Nguyen Bich
Ohashi, Nagayoshi
Parsons, Harriet
Peretto, Nicolas
Priestley, Felix
Pyo, Tae-soo
Qian, Lei
Qiu, Keping
Rao, Ramprasad
Rawlings, Jonathan
Rawlings, Mark G.
Retter, Brendan
Richer, John
Rigby, Andrew
Saito, Hiro
Savini, Giorgio
Scaife, Anna
Seta, Masumichi
Shimajiri, Yoshito
Shinnaga, Hiroko
Tahani, Mehrnoosh
Tang, Ya-Wen
Tomisaka, Kohji
Tram, Le Ngoc
Tsukamoto, Yusuke
Viti, Serena
Wang, Jia-Wei
Wang, Hongchi
Xie, Jinjin
Yen, Hsi-Wei
Yuan, Jinghua
Yun, Hyeong-Sik
Zenko, Tetsuya
Zhang, Guoyin
Zhang, Chuan-Peng
Zhang, Yapeng
Zhou, Jianjun
Zhu, Lei
de Looze, Ilse
Source :
The Astrophysical Journal, 2021, 918, 85
Publication Year :
2021

Abstract

We present the results of simultaneous 450 $\mu$m and 850 $\mu$m 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 disk-like 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$\pm$421 $\mu$G in the central $\sim$0.12 pc region from 850 $\mu$m polarization data. The corresponding magnetic energy density of 2.04$\times$10$^{-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, 3.0 \%, at 450 $\mu$m in the central 3 arcminute region, which is larger than the median value of 1.2 \% at 850 $\mu$m. 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 $0.59 \pm 0.03$ at 450 $\mu$m and $0.36 \pm 0.04$ at 850 $\mu$m, respectively. We think that the shallow slope at 850 $\mu$m is due to grain alignment at the center being assisted by strong radiation from the central young stellar objects.<br />Comment: 17 pages, 11 figures, 4 tables

Details

Database :
arXiv
Journal :
The Astrophysical Journal, 2021, 918, 85
Publication Type :
Report
Accession number :
edsarx.2109.13543
Document Type :
Working Paper
Full Text :
https://doi.org/10.3847/1538-4357/ac0ce9