X-ray quasi-periodic oscillations in active galactic nuclei and their implications for the changing-look phenomenon
文献类型：期刊论文
| 作者 | Sun, Mouyuan1; Zhou, Shuying1; Liu, Jihong1; Jiang, Ning2,3; Cai, Zhen-Yi2,3; Feng HC(封海成)4,5,6,7; Guo, Hengxiao8; Zhang, Zhi-Xiang9; Han, Qinbo1; Li, Juan1 |
| 刊名 | ASTRONOMY & ASTROPHYSICS
 |
| 出版日期 | 2026-04-08 |
| 卷号 | 708 |
| 关键词 | accretion accretion disks quasars: general galaxies: Seyfert X-rays: galaxies |
| ISSN号 | 0004-6361 |
| DOI | 10.1051/0004-6361/202557983 |
| 产权排序 | 第4完成单位 |
| 文献子类 | Article |
| 英文摘要 | X-ray timing of active galactic nuclei (AGNs) provides a unique probe of gas accretion onto supermassive black holes (SMBHs). Quasi-periodic oscillations (QPOs), which trace gas dynamics in the strongly curved spacetime around SMBHs, are rare in AGN. These signals are often analogs of high-frequency QPOs occasionally seen in some black-hole X-ray binaries, and their scarcity in AGN can partly be attributed to the low frequencies expected for typical SMBH masses. Intriguingly, robust X-ray QPO detections in SMBH systems have so far been reported only in narrow-line Seyfert 1 galaxies (NLS1s) and tidal disruption events (TDEs). Here we report the discovery of a QPO candidate during the 2018 outburst of the changing-look AGN (CL-AGN) NGC 1566. Numerical simulations indicate that the disk epicyclic oscillations responsible for high-frequency QPOs are damped by magnetohydrodynamic turbulence unless the accretion flow is misaligned and/or eccentric. In TDEs, the stellar debris stream is naturally misaligned with the SMBH spin, while NLS1s may host misaligned disks due to their youth. Motivated by the QPO candidate in NGC 1566, we propose that CL-AGN accretion is also misaligned - potentially fueled by captured, free-falling broad-line region clouds. This model naturally explains why CL-AGN transition timescales are much shorter than the standard disk viscous timescale. This picture can be tested by searching for QPOs or quasi-periodic eruptions in other CL-AGNs. |
| 学科主题 | 天文学 ; 天体物理学 ; 高能天体物理学 ; 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 | LENS-THIRRING PRECESSION ; SEYFERT 1 GALAXIES ; SUPERMASSIVE BLACK-HOLES ; TIDAL DISRUPTION EVENTS ; STAR-DISK COLLISIONS ; HIGH-FREQUENCY QPOS ; BROAD-LINE REGION ; SIMILAR-TO-1 HOUR ; SYSTEMATIC SEARCH ; ACCRETION DISKS |
| 资助项目 | [12322303] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001736070300001 |
| 出版者 | EDP SCIENCES S A |
| 资助机构 | [12322303] |
| 版本 | 出版稿 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/29128]  |
| 专题 | 云南天文台_丽江天文观测站（南方基地） |
| 通讯作者 | Sun, Mouyuan |
| 作者单位 | 1.Department of Astronomy, Xiamen University, Xiamen, Fujian 361005, PR China; 2.Department of Astronomy, University of Science and Technology of China, Hefei, Anhui 230026, PR China; 3.School of Astronomy and Space Science, University of Science and Technology of China, Hefei, Anhui 230026, PR China; 4.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216 Yunnan, PR China; 5.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650216 Yunnan, PR China; 6.Center for Astronomical Mega-Science, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing 100012, PR China; 7.Key Laboratory of Radio Astronomy and Technology, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing 100101, PR China; 8.Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030, PR China; 9.College of Physics and Information Engineering, Quanzhou Normal University, Quanzhou, Fujian 362000, PR China |
| 推荐引用方式 GB/T 7714 | Sun, Mouyuan,Zhou, Shuying,Liu, Jihong,et al. X-ray quasi-periodic oscillations in active galactic nuclei and their implications for the changing-look phenomenon[J]. ASTRONOMY & ASTROPHYSICS,2026,708. |
| APA | Sun, Mouyuan.,Zhou, Shuying.,Liu, Jihong.,Jiang, Ning.,Cai, Zhen-Yi.,...&Xue, Yongquan.(2026).X-ray quasi-periodic oscillations in active galactic nuclei and their implications for the changing-look phenomenon.ASTRONOMY & ASTROPHYSICS,708. |
| MLA | Sun, Mouyuan,et al."X-ray quasi-periodic oscillations in active galactic nuclei and their implications for the changing-look phenomenon".ASTRONOMY & ASTROPHYSICS 708(2026). |
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来源：云南天文台
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