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

doi:10.3847/1538-4357/ac0ce9

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	The JCMT BISTRO Survey: An 850/450 μm Polarization Study of NGC 2071IR in Orion B
	Lyo,A-Ran 1; Kim,Jongsoo 1,2; Sadavoy,Sarah 3; Johnstone,Doug 4,5; Berry,David 6; Pattle,Kate 7; Kwon,Woojin 8,9; Bastien,Pierre 10; Onaka,Takashi 11,12; Di Francesco,James 4,5
刊名	The Astrophysical Journal
	2021-09-01
卷号	918 期号:2
关键词	Star-forming regions Interstellar magnetic fields Interstellar medium Polarimetry
ISSN号	0004-637X
DOI	10.3847/1538-4357/ac0ce9
通讯作者	Lyo,A-Ran()
英文摘要	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.
语种	英语
出版者	The American Astronomical Society
WOS记录号	IOP:0004-637X-918-2-AC0CE9
内容类型	期刊论文
源URL	[http://ir.xao.ac.cn/handle/45760611-7/4237]
专题	研究单元未命名
通讯作者	Lyo,A-Ran
作者单位	1.Korea Astronomy and Space Science Institute, 776 Daedeokdae-ro, Yuseong-gu, Daejeon 34055, Republic of Korea 2.University of Science and Technology, Korea, 217 Gajeong-ro, Yuseong-gu, Daejeon 34113, Republic of Korea 3.Department for Physics, Engineering Physics and Astrophysics, Queen’s University, Kingston, ON, K7L 3N6, Canada 4.NRC Herzberg Astronomy and Astrophysics, 5071 West Saanich Road, Victoria, BC V9E 2E7, Canada 5.Department of Physics and Astronomy, University of Victoria, Victoria, BC V8W 2Y2, Canada 6.East Asian Observatory, 660 N. A’ohōkū Place, University Park, Hilo, HI 96720, USA 7.Centre for Astronomy, School of Physics, National University of Ireland Galway, University Road, Galway, Ireland 8.Department of Earth Science Education, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea 9.SNU Astronomy Research Center, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea 10.Centre de recherche en astrophysique du Québec & département de physique, Université de Montréal, 1375, Avenue Thérése-Lavoie-Roux, Montréal, QC, H2V OB3, Canada
推荐引用方式 GB/T 7714	Lyo,A-Ran,Kim,Jongsoo,Sadavoy,Sarah,et al. The JCMT BISTRO Survey: An 850/450 μm Polarization Study of NGC 2071IR in Orion B[J]. The Astrophysical Journal,2021,918(2).
APA	Lyo,A-Ran.,Kim,Jongsoo.,Sadavoy,Sarah.,Johnstone,Doug.,Berry,David.,...&van Loo,Sven.(2021).The JCMT BISTRO Survey: An 850/450 μm Polarization Study of NGC 2071IR in Orion B.The Astrophysical Journal,918(2).
MLA	Lyo,A-Ran,et al."The JCMT BISTRO Survey: An 850/450 μm Polarization Study of NGC 2071IR in Orion B".The Astrophysical Journal 918.2(2021).