JCMT BISTRO Survey: Magnetic Fields within the Hub-filament Structure in IC 5146
文献类型：期刊论文
| 作者 | Wang, Jia-Wei1,2; Lai, Shih-Ping1,2; Eswaraiah, Chakali1,2,3; Pattle, Kate1,2; Di Francesco, James4,5; Johnstone, Doug4,5; Koch, Patrick M.6; Liu, Tie7,8; Tamura, Motohide9,10,11; Furuya, Ray S.12,13 |
| 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 |
| 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 |
| WOS记录号 | WOS:000466800100004 |
| 出版者 | IOP PUBLISHING LTD |
| 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. |
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来源：紫金山天文台
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