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

文献类型：期刊论文

作者Ngoc, Nguyen Bich1; Diep, Pham Ngoc1; Parsons, Harriet2; Pattle, Kate3; Hoang, Thiem4,5; Ward-Thompson, Derek6; Tram, Le Ngoc7; Hull, Charles L. H.8,9; Tahani, Mehrnoosh10; Furuya, Ray11
刊名ASTROPHYSICAL JOURNAL
出版日期2021-02-01
卷号908期号:1页码:105
ISSN号0004-637X
关键词Interstellar magnetic fields Molecular clouds Star formation
DOI10.3847/1538-4357/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
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.Vietnam Acad Sci & Technol, Vietnam Natl Space Ctr, 18 Hoang Quoc Viet, Hanoi, Vietnam
2.East Asian Observ, 660 N Aohoku Pl,Univ Pk, Hilo, HI 96720 USA
3.Natl Univ Ireland Galway, Univ Rd, Galway H91 TK33, Ireland
4.Korea Astron & Space Sci Inst, 776 Daedeokdae Ro, Daejeon 34055, South Korea
5.Univ Sci & Technol, 217 Gajeong Ro, Daejeon 34113, South Korea
6.Univ Cent Lancashire, Jeremiah Horrocks Inst, Preston PR1 2HE, Lancs, England
7.Univ Sci & Technol Hanoi, Vietnam Acad Sci & Technol, 18 Hoang Quoc Viet, Hanoi, Vietnam
8.NAOJ Chile, Natl Astron Observ Japan, Alonso Cordova 3788,Off 61B, Santiago 7630422, Chile
9.Joint ALMA Observ, Alonso Cordova 3107, Santiago, Chile
10.Natl Res Council Canada, Herzberg Astron & Astrophys Res Ctr, Domin Radio Astrophys Observ, POB 248, Penticton, BC V2A 6J9, Canada
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.

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