Horizon-scale variability of M87*from 2017-2021 EHT observations
文献类型：期刊论文
| 作者 | Akiyama, The Event Horizon Telescope Collaboration Kazunori2,3,4; Albentosa, Ezequiel5; Alberdi, Antxon6; Alef, Walter7; Algaba, Juan Carlos8; Anantua, Richard4,9,10,11; Asada, Keiichi12; Azulay, Rebecca5,7,13; Bach, Uwe7; Baczko, Anne-Kathrin7,14 |
| 刊名 | ASTRONOMY & ASTROPHYSICS
 |
| 出版日期 | 2025-12-16 |
| 卷号 | 704 |
| 关键词 | accretion accretion disks black hole physics gravitation galaxies: active galaxies: individual: M87* galaxies: jets |
| ISSN号 | 0004-6361 |
| DOI | 10.1051/0004-6361/202555855 |
| 产权排序 | 第112完成单位 |
| 文献子类 | Article |
| 英文摘要 | We report three epochs of polarized images of M87* at 230 GHz using data from the Event Horizon Telescope (EHT) taken in 2017, 2018, and 2021. The baseline coverage of the 2021 observations is significantly improved through the addition of two new EHT stations: the 12 m Kitt Peak Telescope and the Northern Extended Millimetre Array (NOEMA). All observations result in images dominated by a bright, asymmetric ring with a persistent diameter of 43.9 +/- 0.6 mu as, consistent with expectations for lensed synchrotron emission encircling the apparent shadow of a supermassive black hole. We find that the total intensity and linear polarization of M87* vary significantly across the three epochs. Specifically, the azimuthal brightness distribution of the total intensity images varies from year to year, as expected for a stochastic accretion flow. However, despite a gamma-ray flare erupting in M87 quasi-contemporaneously to the 2018 observations, the 2018 and 2021 images look remarkably similar. The resolved linear polarization fractions in 2018 and 2021 peak at similar to 5%, compared to similar to 15% in 2017. The spiral polarization pattern on the ring also varies from year to year, including a change in the electric vector position angle helicity in 2021 that could reflect changes in the magnetized accretion flow or an external Faraday screen. The improved 2021 coverage also provides the first EHT constraints on jet emission outside the ring, on scales of less than or similar to 1 mas. Overall, these observations provide strong proof of the reliability of the EHT images and probe the dynamic properties of the horizon-scale accretion flow surrounding M87*. |
| 学科主题 | 天文学 ; 星系与宇宙学 |
| URL标识 | 查看原文 |
| 出版地 | 17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE |
| WOS关键词 | M87 EVENT HORIZON ; BASE-LINE INTERFEROMETRY ; SUPERMASSIVE BLACK-HOLE ; BAND MULTIWAVELENGTH PROPERTIES ; RESULTS. VII. POLARIZATION ; MAGNETIC-FIELD STRUCTURE ; SCHWARZSCHILD RADII ; PERSISTENT SHADOW ; VLBI OBSERVATIONS ; FARADAY-ROTATION |
| 资助项目 | Academia Sinica; Academy of Finland[274477]; Academy of Finland[284495]; Academy of Finland[312496]; Academy of Finland[315721]; Agencia Nacional de Investigacion y Desarrollo (ANID), Chile[NCN19_058]; Fondecyt[1221421]; BASAL[FB210003]; Alexander von Humboldt Stiftung (including the Feodor Lynen Fellowship); Alfred P. Sloan Research Fellowship; Allegro, the European ALMA Regional Centre node in the Netherlands; NL astronomy research network NOVA; astronomy institutes of the University of Amsterdam, Leiden University; Radboud University |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001645252600001 |
| 出版者 | EDP SCIENCES S A |
| 资助机构 | Academia Sinica ; Academy of Finland[274477, 284495, 312496, 315721] ; Agencia Nacional de Investigacion y Desarrollo (ANID), Chile[NCN19_058] ; Fondecyt[1221421] ; BASAL[FB210003] ; Alexander von Humboldt Stiftung (including the Feodor Lynen Fellowship) ; Alfred P. Sloan Research Fellowship ; Allegro, the European ALMA Regional Centre node in the Netherlands ; NL astronomy research network NOVA ; astronomy institutes of the University of Amsterdam, Leiden University ; Radboud University |
| 版本 | 出版稿 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/28887]  |
| 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 | Laurentis, Mariafelicia De |
| 作者单位 | 1.Astronomy Department, University of Science and Technology of China, Hefei 230026, PR China; 2.Massachusetts Institute of Technology Haystack Observatory, 99 Millstone Road, Westford, MA 01886, USA; 3.National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan; 4.Black Hole Initiative at Harvard University, 20 Garden Street, Cambridge, MA 02138, USA; 5.Departament d’Astronomia i Astrofísica, Universitat de Valéncia, C. Dr. Moliner 50, E-46100 Burjassot, Valéncia, Spain; 6.Instituto de Astrofísica de Andalucía-CSIC, Glorieta de la Astronomía s/n, E-18008 Granada, Spain; 7.Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany; 8.Department of Physics, Faculty of Science, Universiti Malaya, 50603 Kuala Lumpur, Malaysia; 9.Department of Physics & Astronomy, The University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, USA; 10.Physics & Astronomy Department, Rice University, Houston, TX 77005-1827, USA; |
| 推荐引用方式 GB/T 7714 | Akiyama, The Event Horizon Telescope Collaboration Kazunori,Albentosa, Ezequiel,Alberdi, Antxon,et al. Horizon-scale variability of M87*from 2017-2021 EHT observations[J]. ASTRONOMY & ASTROPHYSICS,2025,704. |
| APA | Akiyama, The Event Horizon Telescope Collaboration Kazunori.,Albentosa, Ezequiel.,Alberdi, Antxon.,Alef, Walter.,Algaba, Juan Carlos.,...&Young, Matthew R..(2025).Horizon-scale variability of M87*from 2017-2021 EHT observations.ASTRONOMY & ASTROPHYSICS,704. |
| MLA | Akiyama, The Event Horizon Telescope Collaboration Kazunori,et al."Horizon-scale variability of M87*from 2017-2021 EHT observations".ASTRONOMY & ASTROPHYSICS 704(2025). |
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来源：云南天文台
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