First M87 Event Horizon Telescope Results. VII. Polarization of the Ring
文献类型：期刊论文
| 作者 | Akiyama,Kazunori3,4,5; Algaba,Juan Carlos6; Alberdi,Antxon7; Alef,Walter8; Anantua,Richard5,9,10; Asada,Keiichi11; Azulay,Rebecca8,12,13; Baczko,Anne-Kathrin8; Ball,David14; Balokovi?,Mislav15,16 |
| 刊名 | The Astrophysical Journal Letters
 |
| 出版日期 | 2021-03-01 |
| 卷号 | 910期号:1 |
| 关键词 | Polarimetry Radio interferometry Very long baseline interferometry Supermassive black holes Active galactic nuclei Low-luminosity active galactic nuclei Astronomy data modeling Galaxy accretion disks Galaxies: individual: M87 |
| ISSN号 | 2041-8205 |
| DOI | 10.3847/2041-8213/abe71d |
| 英文摘要 | Abstract In 2017 April, the Event Horizon Telescope (EHT) observed the near-horizon region around the supermassive black hole at the core of the M87 galaxy. These 1.3 mm wavelength observations revealed a compact asymmetric ring-like source morphology. This structure originates from synchrotron emission produced by relativistic plasma located in the immediate vicinity of the black hole. Here we present the corresponding linear-polarimetric EHT images of the center of M87. We find that only a part of the ring is significantly polarized. The resolved fractional linear polarization has a maximum located in the southwest part of the ring, where it rises to the level of ～15%. The polarization position angles are arranged in a nearly azimuthal pattern. We perform quantitative measurements of relevant polarimetric properties of the compact emission and find evidence for the temporal evolution of the polarized source structure over one week of EHT observations. The details of the polarimetric data reduction and calibration methodology are provided. We carry out the data analysis using multiple independent imaging and modeling techniques, each of which is validated against a suite of synthetic data sets. The gross polarimetric structure and its apparent evolution with time are insensitive to the method used to reconstruct the image. These polarimetric images carry information about the structure of the magnetic fields responsible for the synchrotron emission. Their physical interpretation is discussed in an accompanying publication. |
| 语种 | 英语 |
| WOS记录号 | IOP:2041-8205-910-1-ABE71D |
| 出版者 | The American Astronomical Society |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/60198]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Loinard,Laurent |
| 作者单位 | 1.Instituto de Radioastronomía Milimétrica, IRAM, Avenida Divina Pastora 7, Local 20, E-18012, Granada, Spain 2.Department of Physics, University of Illinois, 1110 West Green Street, Urbana, IL 61801, USA 3.Massachusetts Institute of Technology Haystack Observatory, 99 Millstone Road, Westford, MA 01886, USA 4.National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan 5.Black Hole Initiative at Harvard University, 20 Garden Street, Cambridge, MA 02138, USA 6.Department of Physics, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia 7.Instituto de Astrofísica de Andalucía-CSIC, Glorieta de la Astronomía s/n, E-18008 Granada, Spain 8.Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany 9.Center for Astrophysics ∣ Harvard & Smithsonian, 60 Garden Street, Cambridge, MA 02138, USA 10.Center for Computational Astrophysics, Flatiron Institute, 162 Fifth Avenue, New York, NY 10010, USA |
| 推荐引用方式 GB/T 7714 | Akiyama,Kazunori,Algaba,Juan Carlos,Alberdi,Antxon,et al. First M87 Event Horizon Telescope Results. VII. Polarization of the Ring[J]. The Astrophysical Journal Letters,2021,910(1). |
| APA | Akiyama,Kazunori.,Algaba,Juan Carlos.,Alberdi,Antxon.,Alef,Walter.,Anantua,Richard.,...&Zhao,Shan-Shan.(2021).First M87 Event Horizon Telescope Results. VII. Polarization of the Ring.The Astrophysical Journal Letters,910(1). |
| MLA | Akiyama,Kazunori,et al."First M87 Event Horizon Telescope Results. VII. Polarization of the Ring".The Astrophysical Journal Letters 910.1(2021). |
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来源：国家天文台
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