What Produces Dust Polarization in the HH 212 Protostellar Disk at 878 μm: Dust Self-scattering or Dichroic Extinction?
文献类型：期刊论文
| 作者 | Lee,Chin-Fei2,3; Li,Zhi-Yun4; Yang,Haifeng5; Daniel Lin,Zhe-Yu4; Ching,Tao-Chung1,6; Lai,Shih-Ping2,7 |
| 刊名 | The Astrophysical Journal
 |
| 出版日期 | 2021-03-01 |
| 卷号 | 910期号:1 |
| 关键词 | Star formation Accretion Young stellar objects Polarimetry Magnetic fields |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/abe53a |
| 英文摘要 | Abstract We report the results of new dust polarization of a nearly edge-on disk in the HH 212 protostellar system, obtained with the Atacama Large Millimeter/submillimeter Array at ～0.035″ (14 au) resolution in a continuum at λ ～ 878 μm. Dust polarization is detected within ～44 au of the central source, where a rotationally supported disk has formed. The polarized emission forms V-shaped structures opening to the east, and probably to the west, arising from the disk surfaces and arm structures further away in the east and west, which could be due to potential spiral arms excited in the outer disk. The orientations of the polarization are mainly parallel to the minor axis of the disk, with some in the western part tilting slightly away from the minor axis to form a concave shape with respect to the center. This tilting of the orientations of the polarization is expected from dust self-scattering, e.g., by 50?75 μm grains in a young disk. The intensity and degree of the polarization both peak near the central source with a small dip at the central source and decrease toward the edges. These decreases in the intensity and degree of polarization are expected from dichroic extinction by grains aligned by poloidal fields, but may also be consistent with dust self-scattering if the grain size decreases toward the edges. It is possible that both mechanisms are needed to produce the observed dust polarization, suggesting the presence of both grain growth and poloidal fields in the disk. |
| 语种 | 英语 |
| WOS记录号 | IOP:0004-637X-910-1-ABE53A |
| 出版者 | The American Astronomical Society |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/60023]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Lee,Chin-Fei |
| 作者单位 | 1.National Astronomical Observatories, Chinese Academy of Sciences, A20 Datun Road, Chaoyang District, Beijing 100012, People's Republic of China 2.Academia Sinica Institute of Astronomy and Astrophysics, P.O. Box 23-141, Taipei 106, Taiwan; cflee@asiaa.sinica.edu.tw 3.Graduate Institute of Astronomy and Astrophysics, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan 4.Astronomy Department, University of Virginia, Charlottesville, VA 22904, USA 5.Institute for Advanced Study, Tsinghua University, Beijing, 100084, People's Republic of China 6.CAS Key Laboratory of FAST, National Astronomical Observatories, Chinese Academy of Sciences, People's Republic of China 7.Institute of Astronomy and Department of Physics, National Tsing Hua University, Hsinchu, Taiwan |
| 推荐引用方式 GB/T 7714 | Lee,Chin-Fei,Li,Zhi-Yun,Yang,Haifeng,et al. What Produces Dust Polarization in the HH 212 Protostellar Disk at 878 μm: Dust Self-scattering or Dichroic Extinction?[J]. The Astrophysical Journal,2021,910(1). |
| APA | Lee,Chin-Fei,Li,Zhi-Yun,Yang,Haifeng,Daniel Lin,Zhe-Yu,Ching,Tao-Chung,&Lai,Shih-Ping.(2021).What Produces Dust Polarization in the HH 212 Protostellar Disk at 878 μm: Dust Self-scattering or Dichroic Extinction?.The Astrophysical Journal,910(1). |
| MLA | Lee,Chin-Fei,et al."What Produces Dust Polarization in the HH 212 Protostellar Disk at 878 μm: Dust Self-scattering or Dichroic Extinction?".The Astrophysical Journal 910.1(2021). |
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