The JCMT BISTRO Survey: The Magnetic Field in the Starless Core rho Ophiuchus C
文献类型：期刊论文
| 作者 | Liu, Junhao1,2,3; Qiu, Keping1,2; Berry, David4; Di Francesco, James5,6; Bastien, Pierre7,8; Koch, Patrick M.9; Furuya, Ray S.10,11; Kim, Kee-Tae12; Coude, Simon8,13; Lee, Chang Won12,14 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2019-05-20 |
| 卷号 | 877期号:1页码:17 |
| ISSN号 | 0004-637X |
| 关键词 | ISM: individual objects (Ophiuchus) magnetic fields polarization stars: formation |
| DOI | 10.3847/1538-4357/ab0958 |
| 通讯作者 | Qiu, Keping(kpqiu@nju.edu.cn) |
| 英文摘要 | We report 850 mu m dust polarization observations of a low-mass (similar to 12 M-circle dot) starless core in the rho Ophiuchus cloud, Ophiuchus C, made with the POL-2 instrument on the James Clerk Maxwell Telescope (JCMT) as part of the JCMT B-fields In STar-forming Region Observations survey. We detect an ordered magnetic field projected on the plane of the sky in the starless core. The magnetic field across the similar to 0.1 pc core shows a predominant northeast-southwest orientation centering between similar to 40 degrees and similar to 100 degrees, indicating that the field in the core is well aligned with the magnetic field in lower-density regions of the cloud probed by near-infrared observations and also the cloud-scale magnetic field traced by Planck observations. The polarization percentage (P) decreases with increasing total intensity (I), with a power-law index of -1.03 +/- 0.05. We estimate the plane-of-sky field strength (B-pos) using modified Davis-Chandrasekhar-Fermi methods based on structure function (SF), autocorrelation function (ACF), and unsharp masking (UM) analyses. We find that the estimates from the SF, ACF, and UM methods yield strengths of 103 +/- 46 mu G, 136 +/- 69 mu G, and 213 +/- 115 mu G, respectively. Our calculations suggest that the Ophiuchus C core is near magnetically critical or slightly magnetically supercritical (i.e., unstable to collapse). The total magnetic energy calculated from the SF method is comparable to the turbulent energy in Ophiuchus C, while the ACF method and the UM method only set upper limits for the total magnetic energy because of large uncertainties. |
| WOS关键词 | MOLECULAR CLOUD CORES ; GOULD BELT SURVEY ; MAIN CLOUD ; IMAGING POLARIMETRY ; INITIAL CONDITIONS ; FORMING REGIONS ; DUST OPACITIES ; SCUBA-2 ; PROTOSTARS ; EMISSION |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 出版者 | IOP PUBLISHING LTD |
| WOS记录号 | WOS:000468874600011 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/27001]  |
| 专题 | 中国科学院紫金山天文台 |
| 通讯作者 | Qiu, Keping |
| 作者单位 | 1.Nanjing Univ, Sch Astron & Space Sci, 163 Xianlin Ave, Nanjing 210023, Jiangsu, Peoples R China 2.Nanjing Univ, Key Lab Modern Astron & Astrophys, Minist Educ, Nanjing 210023, Jiangsu, Peoples R China 3.Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA 4.East Asian Observ, 660 N Ohoka Pl,Univ Pk, Hilo, HI 96720 USA 5.NRC Herzberg Astron & Astrophys, 5071 West Saanich Rd, Victoria, BC V9E 2E7, Canada 6.Univ Victoria, Dept Phys & Astron, Victoria, BC V8P 1A1, Canada 7.Univ Montreal, Dept Phys, Inst Rech Exoplanetes iREx, CP 6128 Succ Ctr Ville, Montreal, PQ H3C 3J7, Canada 8.Univ Montreal, Dept Phys, CRAQ, CP 6128 Succ Ctr Ville, Montreal, PQ H3C 3J7, Canada 9.Acad Sinica, Inst Astron & Astrophys, POB 23-141, Taipei 10617, Taiwan 10.Tokushima Univ, Minami Jousanajima Machi 1-1, Tokushima 7708502, Japan |
| 推荐引用方式 GB/T 7714 | Liu, Junhao,Qiu, Keping,Berry, David,et al. The JCMT BISTRO Survey: The Magnetic Field in the Starless Core rho Ophiuchus C[J]. ASTROPHYSICAL JOURNAL,2019,877(1):17. |
| APA | Liu, Junhao.,Qiu, Keping.,Berry, David.,Di Francesco, James.,Bastien, Pierre.,...&Zenko, Tetsuya.(2019).The JCMT BISTRO Survey: The Magnetic Field in the Starless Core rho Ophiuchus C.ASTROPHYSICAL JOURNAL,877(1),17. |
| MLA | Liu, Junhao,et al."The JCMT BISTRO Survey: The Magnetic Field in the Starless Core rho Ophiuchus C".ASTROPHYSICAL JOURNAL 877.1(2019):17. |
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