First M87 Event Horizon Telescope Results. VIII. Magnetic Field Structure near The Event Horizon
文献类型：期刊论文
| 作者 | Akiyama,Kazunori18,19,20; Algaba,Juan Carlos21; Alberdi,Antxon22; Alef,Walter23; Anantua,Richard20,24,125; Asada,Keiichi25; Azulay,Rebecca23,26,27; Baczko,Anne-Kathrin23; Ball,David28; Balokovi?,Mislav1,29 |
| 刊名 | The Astrophysical Journal Letters
 |
| 出版日期 | 2021-03-01 |
| 卷号 | 910期号:1 |
| ISSN号 | 2041-8205 |
| 关键词 | Accretion Black holes Event horizons Jets Kerr black holes Magnetic fields Magnetohydrodynamics Plasma astrophysics Polarimetry Radiative transfer Radio jets Relativistic jets |
| DOI | 10.3847/2041-8213/abe4de |
| 英文摘要 | Abstract Event Horizon Telescope (EHT) observations at 230 GHz have now imaged polarized emission around the supermassive black hole in M87 on event-horizon scales. This polarized synchrotron radiation probes the structure of magnetic fields and the plasma properties near the black hole. Here we compare the resolved polarization structure observed by the EHT, along with simultaneous unresolved observations with the Atacama Large Millimeter/submillimeter Array, to expectations from theoretical models. The low fractional linear polarization in the resolved image suggests that the polarization is scrambled on scales smaller than the EHT beam, which we attribute to Faraday rotation internal to the emission region. We estimate the average density ne ～ 104–7 cm?3, magnetic field strength B ～ 1–30 G, and electron temperature Te ～ (1–12) × 1010 K of the radiating plasma in a simple one-zone emission model. We show that the net azimuthal linear polarization pattern may result from organized, poloidal magnetic fields in the emission region. In a quantitative comparison with a large library of simulated polarimetric images from general relativistic magnetohydrodynamic (GRMHD) simulations, we identify a subset of physical models that can explain critical features of the polarimetric EHT observations while producing a relativistic jet of sufficient power. The consistent GRMHD models are all of magnetically arrested accretion disks, where near-horizon magnetic fields are dynamically important. We use the models to infer a mass accretion rate onto the black hole in M87 of (3–20) × 10?4 M⊙ yr?1. |
| 语种 | 英语 |
| 出版者 | The American Astronomical Society |
| WOS记录号 | IOP:2041-8205-910-1-ABE4DE |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/60185]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Loinard,Laurent |
| 作者单位 | 1.Yale Center for Astronomy & Astrophysics, 52 Hillhouse Avenue, New Haven, CT 06511, USA 2.School of Physics, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, People’s Republic of China 3.School of Astronomy and Space Sciences, University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing 100049, People’s Republic of China 4.Astronomy Department, University of Science and Technology of China, Hefei 230026, People’s Republic of China 5.Netherlands Organisation for Scientific Research (NWO), Postbus 93138, 2509 AC Den Haag, The Netherlands 6.Department of Astronomy, Yonsei University, Yonsei-ro 50, Seodaemun-gu, 03722 Seoul, Republic of Korea 7.School of Mathematics, Trinity College, Dublin 2, Ireland 8.Department of Astrophysical Sciences, Peyton Hall, Princeton University, Princeton, NJ 08544, USA 9.Instituto de Radioastronomía Milimétrica, IRAM, Avenida Divina Pastora 7, Local 20, E-18012, Granada, Spain 10.Hiroshima Astrophysical Science Center, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan |
| 推荐引用方式 GB/T 7714 | Akiyama,Kazunori,Algaba,Juan Carlos,Alberdi,Antxon,et al. First M87 Event Horizon Telescope Results. VIII. Magnetic Field Structure near The Event Horizon[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. VIII. Magnetic Field Structure near The Event Horizon.The Astrophysical Journal Letters,910(1). |
| MLA | Akiyama,Kazunori,et al."First M87 Event Horizon Telescope Results. VIII. Magnetic Field Structure near The Event Horizon".The Astrophysical Journal Letters 910.1(2021). |
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来源：国家天文台
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