First Sagittarius A* Event Horizon Telescope Results. VII. Polarization of the Ring | |
The Event Horizon Telescope Collaboration; The Event Horizon Telescope Collaboration; Akiyama,Kazunori152,153,154; Alberdi,Antxon151; Alef,Walter150; Algaba,Juan Carlos149; Anantua,Richard147,148,152; Asada,Keiichi146; Azulay,Rebecca144,145,150; Bach,Uwe150 | |
刊名 | The Astrophysical Journal Letters |
2024-03-27 | |
卷号 | 964期号:2 |
ISSN号 | 2041-8205 |
DOI | 10.3847/2041-8213/ad2df0 |
产权排序 | 第108完成单位 |
文献子类 | Article |
英文摘要 | Abstract The Event Horizon Telescope observed the horizon-scale synchrotron emission region around the Galactic center supermassive black hole, Sagittarius A* (Sgr A*), in 2017. These observations revealed a bright, thick ring morphology with a diameter of 51.8 ± 2.3 μas and modest azimuthal brightness asymmetry, consistent with the expected appearance of a black hole with mass M ≈ 4 × 106 M ⊙. From these observations, we present the first resolved linear and circular polarimetric images of Sgr A*. The linear polarization images demonstrate that the emission ring is highly polarized, exhibiting a prominent spiral electric vector polarization angle pattern with a peak fractional polarization of ~40% in the western portion of the ring. The circular polarization images feature a modestly (~5%–10%) polarized dipole structure along the emission ring, with negative circular polarization in the western region and positive circular polarization in the eastern region, although our methods exhibit stronger disagreement than for linear polarization. We analyze the data using multiple independent imaging and modeling methods, each of which is validated using a standardized suite of synthetic data sets. While the detailed spatial distribution of the linear polarization along the ring remains uncertain owing to the intrinsic variability of the source, the spiraling polarization structure is robust to methodological choices. The degree and orientation of the linear polarization provide stringent constraints for the black hole and its surrounding magnetic fields, which we discuss in an accompanying publication. |
学科主题 | 天文学 ; 星系与宇宙学 |
URL标识 | 查看原文 |
语种 | 英语 |
出版者 | The American Astronomical Society |
WOS记录号 | IOP:APJL_964_2_L25 |
内容类型 | 期刊论文 |
源URL | [http://ir.ynao.ac.cn/handle/114a53/27081] |
专题 | 云南天文台_中国科学院天体结构与演化重点实验室 |
通讯作者 | Ward-Thompson,Derek |
作者单位 | 1.Department of Astronomy, University of Massachusetts, Amherst, MA 01003, USA 2.Radboud Excellence Fellow of Radboud University, Nijmegen, The Netherlands 3.College of Future Technology, Peking University, Beijing 100871, People's Republic of China 4.Department of Physics and Astronomy, Michigan State University, 567 Wilson Rd., East Lansing, MI 48824, USA 5.Astronomy Department, University of Science and Technology of China, Hefei 230026, People's Republic of China 6.Center for Astronomy and Astrophysics and Department of Physics, Fudan University, Shanghai 200438, People's Republic of China 7.Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, UK 8.School of Physics, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, People's Republic of China 9.School of Natural Sciences, Institute for Advanced Study, 1 Einstein Drive, Princeton, NJ 08540, USA 10.Tuorla Observatory, Department of Physics and Astronomy, University of Turku, Finland |
推荐引用方式 GB/T 7714 | The Event Horizon Telescope Collaboration,The Event Horizon Telescope Collaboration,Akiyama,Kazunori,et al. First Sagittarius A* Event Horizon Telescope Results. VII. Polarization of the Ring[J]. The Astrophysical Journal Letters,2024,964(2). |
APA | The Event Horizon Telescope Collaboration.,The Event Horizon Telescope Collaboration.,Akiyama,Kazunori.,Alberdi,Antxon.,Alef,Walter.,...&Zhao,Shan-Shan.(2024).First Sagittarius A* Event Horizon Telescope Results. VII. Polarization of the Ring.The Astrophysical Journal Letters,964(2). |
MLA | The Event Horizon Telescope Collaboration,et al."First Sagittarius A* Event Horizon Telescope Results. VII. Polarization of the Ring".The Astrophysical Journal Letters 964.2(2024). |
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