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JCMT BISTRO Survey: Magnetic Fields within the Hub-filament Structure in IC 5146

文献类型：期刊论文

作者Kang, Sung-ju7; Kataoka, Akimasa43; Kawabata, Koji S.44,45,46; Kemper, Francisca6; Kim, Jongsoo7,16; Kim, Kyoung Hee47; Kim, Mi-Ryang7; Kim, Shinyoung7,16; Kirk, Jason M.14; Kobayashi, Masato I. N.48
刊名ASTROPHYSICAL JOURNAL
出版日期2019-05-01
卷号876期号:1页码:19
关键词ISM: individual objects (IC 5146) ISM: magnetic fields ISM: structure polarization radio continuum: ISM stars: formation
ISSN号0004-637X
DOI10.3847/1538-4357/ab13a2
通讯作者Wang, Jia-Wei()
英文摘要We present the 850 mu m polarization observations toward the IC 5146 filamentary cloud taken using the Submillimetre Common-User Bolometer Array 2 (SCUBA-2) and its associated polarimeter (POL-2), mounted on the James Clerk Maxwell Telescope, as part of the B-fields In STar forming Regions Observations. This work is aimed at revealing the magnetic field morphology within a core-scale (less than or similar to 1.0 pc) hub-filament structure (HFS) located at the end of a parsec-scale filament. To investigate whether the observed polarization traces the magnetic field in the HFS, we analyze the dependence between the observed polarization fraction and total intensity using a Bayesian approach with the polarization fraction described by the Rice likelihood function, which can correctly describe the probability density function of the observed polarization fraction for low signal-to-noise ratio data. We find a power-law dependence between the polarization fraction and total intensity with an index of 0.56 in A(v) similar to 20-300 mag regions, suggesting that the dust grains in these dense regions can still be aligned with magnetic fields in the IC 5146 regions. Our polarization maps reveal a curved magnetic field, possibly dragged by the contraction along the parsec-scale filament. We further obtain a magnetic field strength of 0.5 +/- 0.2 mG toward the central hub using the Davis-Chandrasekhar-Fermi method, corresponding to a mass-to-flux criticality of similar to 1.3 +/- 0.4 and an Alfvenic Mach number of <0.6. These results suggest that gravity and magnetic field are currently of comparable importance in the HFS and that turbulence is less important.
WOS关键词GOULD BELT SURVEY ; LINEAR-POLARIZATION ; INFRARED POLARIMETRY ; INTERSTELLAR CLOUDS ; RADIATIVE TORQUES ; MOLECULAR CLOUDS ; GRAIN ALIGNMENT ; STAR-FORMATION ; SCUBA-2 ; CONTAMINATION
资助项目Ministry of Finance (MOF) of China ; National Key R&D Program of China[2017YFA0402700] ; Science and Technology Facilities Council of the United Kingdom ; Canada Foundation for Innovation ; East Asian Observatory, JCMT Project[M16AL004] ; Ministry of Science and Technology (MOST) of Taiwan[MOST 105-2119-M-007-021-MY3] ; Ministry of Science and Technology (MOST) of Taiwan[105-2119-M-007-024] ; Ministry of Science and Technology (MOST) of Taiwan[106-2119-M-007-021-MY3] ; MOST of Taiwan[MOST 105-2119-M-007-022-MY3] ; National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning[NRF-2015R1C1A1A01052160] ; NRF - Ministry of Education, Science and Technology[NRF-2016R1A2B4012593] ; NRF[NRF-2016R1C1B2013642] ; National Research Council of Canada ; NSERC Discovery Grant
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:000466800100004
出版者IOP PUBLISHING LTD
资助机构Ministry of Finance (MOF) of China ; National Key R&D Program of China ; Science and Technology Facilities Council of the United Kingdom ; Canada Foundation for Innovation ; East Asian Observatory, JCMT Project ; Ministry of Science and Technology (MOST) of Taiwan ; MOST of Taiwan ; National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning ; NRF - Ministry of Education, Science and Technology ; NRF ; National Research Council of Canada ; NSERC Discovery Grant
源URL[http://ir.xao.ac.cn/handle/45760611-7/2654]  
专题恒星形成与演化研究团组
通讯作者Wang, Jia-Wei
作者单位1.Natl Tsing Hua Univ, Inst Astron, Hsinchu 30013, Taiwan
2.Natl Tsing Hua Univ, Dept Phys, Hsinchu 30013, Taiwan
3.Chinese Acad Sci, Natl Astron Observ, CAS Key Lab FAST, Beijing, Peoples R China
4.NRC Herzberg Astron & Astrophys, 5071 West Saanich Rd, Victoria, BC V9E 2E7, Canada
5.Univ Victoria, Dept Phys & Astron, Victoria, BC V8P 5C2, Canada
6.Acad Sinica, Inst Astron & Astrophys, POB 23-141, Taipei 10617, Taiwan
7.Korea Astron & Space Sci Inst, 776 Daedeokdae Ro, Daejeon 34055, South Korea
8.East Asian Observ, 660 N Aohoku Pl, Hilo, HI 96720 USA
9.Natl Inst Nat Sci, Natl Astron Observ Japan, Mitaka, Tokyo 1818588, Japan
10.Univ Tokyo, Grad Sch Sci, Dept Astron, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1130033, Japan
推荐引用方式
GB/T 7714		 Kang, Sung-ju,Kataoka, Akimasa,Kawabata, Koji S.,et al. JCMT BISTRO Survey: Magnetic Fields within the Hub-filament Structure in IC 5146[J]. ASTROPHYSICAL JOURNAL,2019,876(1):19.
APA Kang, Sung-ju.,Kataoka, Akimasa.,Kawabata, Koji S..,Kemper, Francisca.,Kim, Jongsoo.,...&Kang, Miju.(2019).JCMT BISTRO Survey: Magnetic Fields within the Hub-filament Structure in IC 5146.ASTROPHYSICAL JOURNAL,876(1),19.
MLA Kang, Sung-ju,et al."JCMT BISTRO Survey: Magnetic Fields within the Hub-filament Structure in IC 5146".ASTROPHYSICAL JOURNAL 876.1(2019):19.

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来源：新疆天文台

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