A Pseudodisk Threaded with a Toroidal and Pinched Poloidal Magnetic Field Morphology in the HH 211 Protostellar System
文献类型：期刊论文
| 作者 | Lee,Chin-Fei1,2; Kwon,Woojin3,4; Jhan,Kai-Syun1,2; Hirano,Naomi1; Hwang,Hsiang-Chih5; Lai,Shih-Ping6; Ching,Tao-Chung7,8; Rao,Ramprasad1; Ho,Paul T. P.1 |
| 刊名 | The Astrophysical Journal
 |
| 出版日期 | 2019-07-11 |
| 卷号 | 879期号:2 |
| ISSN号 | 0004-637X |
| 关键词 | accretion, accretion disks ISM: individual objects (HH 211) ISM: jets and outflows stars: formation |
| DOI | 10.3847/1538-4357/ab2458 |
| 英文摘要 | Abstract The HH 211 protostellar system is currently the youngest Class 0 system found with a rotating disk. We have mapped it at ～50 au (0.″16) resolution, studying its magnetic field morphology with dust polarization in continuum at 232 and 358 GHz and its kinematics in C18O J?=?2–1 line. A flattened envelope extending out to ～400 au from the disk is detected in the continuum and C18O, slightly misaligned with the disk by ～8°. It is spiraling inwards and expected to transform into a rotating disk at ～20 au, consistent with the disk radius estimated before. It appears to have a constant specific angular momentum and it can result from an inside–out collapse of an extended envelope detected before in NH3. In the flattened envelope, the polarization is mainly due to the magnetically aligned dust grains, inferring a highly pinched poloidal field morphology there. Thus, both the kinematics and field morphology support that the flattened envelope is a pseudodisk formed as the infalling gas is guided by the field lines to the equatorial plane. Interestingly, a point-symmetric polarization distribution is also seen in the flattened envelope, implying that the pinched field lines also have a significant toroidal component generated by the rotation. No significant loss of angular momentum and thus no clear magnetic braking are detected in the flattened envelope around the disk probably because of the large misalignment between the axis of the rotation and the axis of the magnetic field in the cloud core. |
| 语种 | 英语 |
| 出版者 | The American Astronomical Society |
| WOS记录号 | IOP:0004-637X-879-2-AB2458 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/26936]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 1.Academia Sinica Institute of Astronomy and Astrophysics, P.O. Box 23-141, Taipei 106, Taiwan; cflee@asiaa.sinica.edu.tw 2.Graduate Institute of Astronomy and Astrophysics, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei 10617, Taiwan 3.Korea Astronomy and Space Science Institute (KASI), 776 Daedeokdae-ro, Yuseong-gu, Daejeon 34055, Republic of Korea 4.University of Science and Technology, Korea (UST), 217 Gajeong-ro, Yuseong-gu, Daejeon 34113, Republic of Korea 5.Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218, USA 6.Institute of Astronomy and Department of Physics, National Tsing Hua University, Hsinchu, Taiwan 7.National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, People's Republic of China 8.CAS Key Laboratory of FAST, National Astronomical Observatories, Chinese Academy of Sciences, People's Republic of China |
| 推荐引用方式 GB/T 7714 | Lee,Chin-Fei,Kwon,Woojin,Jhan,Kai-Syun,et al. A Pseudodisk Threaded with a Toroidal and Pinched Poloidal Magnetic Field Morphology in the HH 211 Protostellar System[J]. The Astrophysical Journal,2019,879(2). |
| APA | Lee,Chin-Fei.,Kwon,Woojin.,Jhan,Kai-Syun.,Hirano,Naomi.,Hwang,Hsiang-Chih.,...&Ho,Paul T. P..(2019).A Pseudodisk Threaded with a Toroidal and Pinched Poloidal Magnetic Field Morphology in the HH 211 Protostellar System.The Astrophysical Journal,879(2). |
| MLA | Lee,Chin-Fei,et al."A Pseudodisk Threaded with a Toroidal and Pinched Poloidal Magnetic Field Morphology in the HH 211 Protostellar System".The Astrophysical Journal 879.2(2019). |
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