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

doi:10.3847/1538-4357/ab13a2

	JCMT BISTRO Survey: Magnetic Fields within the Hub-filament Structure in IC 5146
	Wang, Jia-Wei 1,2; Lai, Shih-Ping 1,2; Eswaraiah, Chakali 1,2,3; Pattle, Kate 1,2; Di Francesco, James 4,5; Johnstone, Doug 4,5; Koch, Patrick M.6; Liu, Tie 7,8; Tamura, Motohide 9,10,11; Furuya, Ray S.12,13
刊名	ASTROPHYSICAL JOURNAL
	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
DOI	10.3847/1538-4357/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
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	IOP PUBLISHING LTD
WOS记录号	WOS:000466800100004
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/24690]
专题	中国科学院紫金山天文台
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	Wang, Jia-Wei,Lai, Shih-Ping,Eswaraiah, Chakali,et al. JCMT BISTRO Survey: Magnetic Fields within the Hub-filament Structure in IC 5146[J]. ASTROPHYSICAL JOURNAL,2019,876(1):19.
APA	Wang, Jia-Wei.,Lai, Shih-Ping.,Eswaraiah, Chakali.,Pattle, Kate.,Di Francesco, James.,...&Zhu, Lei.(2019).JCMT BISTRO Survey: Magnetic Fields within the Hub-filament Structure in IC 5146.ASTROPHYSICAL JOURNAL,876(1),19.
MLA	Wang, Jia-Wei,et al."JCMT BISTRO Survey: Magnetic Fields within the Hub-filament Structure in IC 5146".ASTROPHYSICAL JOURNAL 876.1(2019):19.