Observations of Magnetic Fields Surrounding LkH alpha 101 Taken by the BISTRO Survey with JCMT-POL-2

doi:10.3847/1538-4357/abd0fc

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	Observations of Magnetic Fields Surrounding LkH alpha 101 Taken by the BISTRO Survey with JCMT-POL-2
	Ngoc, Nguyen Bich 2; Diep, Pham Ngoc 2; Parsons, Harriet 3; Pattle, Kate 4; Hoang, Thiem 5,6; Ward-Thompson, Derek 7; Tram, Le Ngoc 8; Hull, Charles L. H.9,10; Tahani, Mehrnoosh 11; Furuya, Ray 12
刊名	ASTROPHYSICAL JOURNAL
	2021-02-01
卷号	908 期号:1 页码:105
关键词	Interstellar magnetic fields Molecular clouds Star formation
ISSN号	0004-637X
DOI	10.3847/1538-4357/abd0fc
产权排序	64
英文摘要	We report the first high spatial resolution measurement of magnetic fields surrounding LkH alpha 101, part of the Auriga-California molecular cloud. The observations were taken with the POL-2 polarimeter on the James Clerk Maxwell Telescope within the framework of the B-fields In Star-forming Region Observations (BISTRO) survey. Observed polarization of thermal dust emission at 850 mu m is found to be mostly associated with the redshifted gas component of the cloud. The magnetic field displays a relatively complex morphology. Two variants of the Davis-Chandrasekhar-Fermi method, unsharp masking and structure function, are used to calculate the strength of magnetic fields in the plane of the sky, yielding a similar result of B-POS similar to 115 mu G. The mass-to-magnetic-flux ratio in critical value units, lambda similar to 0.3, is the smallest among the values obtained for other regions surveyed by POL-2. This implies that the LkH alpha 101 region is subcritical, and the magnetic field is strong enough to prevent gravitational collapse. The inferred delta B/B-0 similar to 0.3 implies that the large-scale component of the magnetic field dominates the turbulent one. The variation of the polarization fraction with total emission intensity can be fitted by a power law with an index of alpha = 0.82 0.03, which lies in the range previously reported for molecular clouds. We find that the polarization fraction decreases rapidly with proximity to the only early B star (LkH alpha 101) in the region. Magnetic field tangling and the joint effect of grain alignment and rotational disruption by radiative torques can potentially explain such a decreasing trend.
资助项目	Chinese Academy of Sciences[XDB09000000] ; Science and Technology Facilities Council of the United Kingdom ; Canada Foundation for Innovation ; Vietnam National Foundation for Science and Technology Development (NAFOSTED)[103.99-2019.368] ; National Research Foundation of Korea (NRF) - Korea government (MSIT)[2019R1A2C1087045] ; NAOJ Fellowship ; JSPS KAKENHI[18K13586] ; JSPS KAKENHI[20K14527] ; JSPS KAKENHI[18H05442] ; JSPS KAKENHI[15H02063] ; JSPS KAKENHI[22000005] ; JSPS KAKENHI[19K14775] ; National Research Council of Canada ; NSERC ; Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education, Science and Technology[NRF-2019R1A2C1010851] ; Seoul National University ; Ministry of Science and Technology (MOST) in Taiwan[MOST 108-2112-M-001-003-MY2] ; Fondecyt[3190161] ; Ministry of Science and Technology of Taiwan[MoST107-2119-M-001-031-MY3] ; Academia Sinica[AS-IA-106-M03] ; [M16AL004]
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000616089400001
资助机构	Chinese Academy of Sciences ; Science and Technology Facilities Council of the United Kingdom ; Canada Foundation for Innovation ; Vietnam National Foundation for Science and Technology Development (NAFOSTED) ; National Research Foundation of Korea (NRF) - Korea government (MSIT) ; NAOJ Fellowship ; JSPS KAKENHI ; National Research Council of Canada ; NSERC ; Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education, Science and Technology ; Seoul National University ; Ministry of Science and Technology (MOST) in Taiwan ; Fondecyt ; Ministry of Science and Technology of Taiwan ; Academia Sinica
内容类型	期刊论文
源URL	[http://ir.xao.ac.cn/handle/45760611-7/3862]
专题	恒星形成与演化研究团组
通讯作者	Diep, Pham Ngoc
作者单位	1.Chinese Univ Hong Kong, Dept Phys, Shatin, Hong Kong, Peoples R China 2.Vietnam Acad Sci & Technol, Vietnam Natl Space Ctr, 18 Hoang Quoc Viet, Hanoi, Vietnam 3.East Asian Observ, 660 N Aohoku Pl,Univ Pk, Hilo, HI 96720 USA 4.Natl Univ Ireland Galway, Univ Rd, Galway H91 TK33, Ireland 5.Korea Astron & Space Sci Inst, 776 Daedeokdae Ro, Daejeon 34055, South Korea 6.Univ Sci & Technol, 217 Gajeong Ro, Daejeon 34113, South Korea 7.Univ Cent Lancashire, Jeremiah Horrocks Inst, Preston PR1 2HE, Lancs, England 8.Univ Sci & Technol Hanoi, Vietnam Acad Sci & Technol, 18 Hoang Quoc Viet, Hanoi, Vietnam 9.NAOJ Chile, Natl Astron Observ Japan, Alonso Cordova 3788,Off 61B, Santiago 7630422, Chile 10.Joint ALMA Observ, Alonso Cordova 3107, Santiago, Chile
推荐引用方式 GB/T 7714	Ngoc, Nguyen Bich,Diep, Pham Ngoc,Parsons, Harriet,et al. Observations of Magnetic Fields Surrounding LkH alpha 101 Taken by the BISTRO Survey with JCMT-POL-2[J]. ASTROPHYSICAL JOURNAL,2021,908(1):105.
APA	Ngoc, Nguyen Bich.,Diep, Pham Ngoc.,Parsons, Harriet.,Pattle, Kate.,Hoang, Thiem.,...&van Loo, Sven.(2021).Observations of Magnetic Fields Surrounding LkH alpha 101 Taken by the BISTRO Survey with JCMT-POL-2.ASTROPHYSICAL JOURNAL,908(1),105.
MLA	Ngoc, Nguyen Bich,et al."Observations of Magnetic Fields Surrounding LkH alpha 101 Taken by the BISTRO Survey with JCMT-POL-2".ASTROPHYSICAL JOURNAL 908.1(2021):105.