First M87 Event Horizon Telescope Results. IV. Imaging the Central Supermassive Black Hole
文献类型：期刊论文
| 作者 | Akiyama,Kazunori18,19,20,31; Alberdi,Antxon21; Alef,Walter22; Asada,Keiichi23; Azulay,Rebecca22,24,25; Baczko,Anne-Kathrin22; Ball,David26; Balokovi?,Mislav20,27; Barrett,John18; Bintley,Dan28 |
| 刊名 | The Astrophysical Journal Letters
 |
| 出版日期 | 2019-04-10 |
| 卷号 | 875期号:1 |
| ISSN号 | 2041-8205 |
| 关键词 | black hole physics galaxies: individual (M87) galaxies: jets techniques: high angular resolution techniques: image processing techniques: interferometric |
| DOI | 10.3847/2041-8213/ab0e85 |
| 英文摘要 | Abstract We present the first Event Horizon Telescope (EHT) images of M87, using observations from April 2017 at 1.3 mm wavelength. These images show a prominent ring with a diameter of ～40 μas, consistent with the size and shape of the lensed photon orbit encircling the “shadow” of a supermassive black hole. The ring is persistent across four observing nights and shows enhanced brightness in the south. To assess the reliability of these results, we implemented a two-stage imaging procedure. In the first stage, four teams, each blind to the others’ work, produced images of M87 using both an established method (CLEAN) and a newer technique (regularized maximum likelihood). This stage allowed us to avoid shared human bias and to assess common features among independent reconstructions. In the second stage, we reconstructed synthetic data from a large survey of imaging parameters and then compared the results with the corresponding ground truth images. This stage allowed us to select parameters objectively to use when reconstructing images of M87. Across all tests in both stages, the ring diameter and asymmetry remained stable, insensitive to the choice of imaging technique. We describe the EHT imaging procedures, the primary image features in M87, and the dependence of these features on imaging assumptions. |
| 语种 | 英语 |
| 出版者 | The American Astronomical Society |
| WOS记录号 | IOP:2041-8205-875-1-AB0E85 |
| 源URL | [http://119.78.226.72/handle/331011/31823]  |
| 专题 | 中国科学院上海天文台 |
| 作者单位 | 1.School of Physics, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, People’s Republic of China 2.Physics Department, Brandeis University, 415 South Street, Waltham, MA 02453, USA 3.Leiden Observatory, Leiden University, Postbus 2300, 9513 RA Leiden, The Netherlands 4.Department of Physics and Astronomy, Seoul National University, Gwanak-gu, Seoul 08826, Republic of Korea 5.Astronomical Institute, Tohoku University, Sendai 980-8578, Japan 6.Frontier Research Institute for Interdisciplinary Sciences, Tohoku University, Sendai 980-8578, Japan 7.Netherlands Organisation for Scientific Research (NWO), Postbus 93138, 2509 AC Den Haag, The Netherlands 8.Department of Astronomy, Yonsei University, Yonsei-ro 50, Seodaemun-gu, 03722 Seoul, Republic of Korea 9.Aalto University Mets?hovi Radio Observatory, Mets?hovintie 114, FI-02540 Kylm?l?, Finland 10.Aalto University Department of Electronics and Nanoengineering, PL 15500, FI-00076 Aalto, Finland |
| 推荐引用方式 GB/T 7714 | Akiyama,Kazunori,Alberdi,Antxon,Alef,Walter,et al. First M87 Event Horizon Telescope Results. IV. Imaging the Central Supermassive Black Hole[J]. The Astrophysical Journal Letters,2019,875(1). |
| APA | Akiyama,Kazunori.,Alberdi,Antxon.,Alef,Walter.,Asada,Keiichi.,Azulay,Rebecca.,...&Yamaguchi,Paul.(2019).First M87 Event Horizon Telescope Results. IV. Imaging the Central Supermassive Black Hole.The Astrophysical Journal Letters,875(1). |
| MLA | Akiyama,Kazunori,et al."First M87 Event Horizon Telescope Results. IV. Imaging the Central Supermassive Black Hole".The Astrophysical Journal Letters 875.1(2019). |
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