Magnetic Reconnection as a Potential Driver of X-Ray Variability in Active Galactic Nuclei
文献类型：期刊论文
| 作者 | Hu, Chen-Ran10; Huang, Yong-Feng9,10; Cui, Lang4,6,8; Zhang, Hanle10; Li, Jiang-Tao2; Ji, Li2,3; Geng, Jin-Jun2; Amat, Orkash10; Xu, Fan7; Du, Chen10 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2025-10-10 |
| 卷号 | 992期号:1页码:12 |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/adfed2 |
| 通讯作者 | Huang, Yong-Feng(hyf@nju.edu.cn) |
| 英文摘要 | We present a systematic analysis on the X-ray variability in 13 bright quasars at z > 4.5, combining recent Swift observations from 2021 to 2023 and archival multiepoch observations. Upper limits of the luminosity measurements were included in the analysis by using the Kaplan-Meier estimator method. It is found that the high-redshift quasars exhibit X-ray variability on both short-term (hours to days) and intermediate-term (weeks to months) timescales, with short-term variability dominating the overall variation. A linear correlation exists between the global mean (mu(L2-10kev)) and standard deviation (sigma(L2-10keV)) of X-ray luminosities, which is independent of the X-ray photon index and optical-to-X-ray spectral slope. The localized stochastic magnetic reconnection mechanism is strongly favored, which can naturally lead to a scale-invariant power-law energy distribution and satisfactorily explain the correlation. The sigma-mu correlation parallels the well-documented rms-flux relation of low-redshift active galactic nuclei (AGNs), implying that the magnetic reconnection mechanism could drive short-timescale X-ray variability in both high- and low-redshift AGNs. The highest-redshift quasar in our sample, J142952+544717 (z = 6.18), shows a luminosity distribution extending to 10(47) erg s(-1) with a not conspicuous median luminosity. On the other hand, J143023+420436 (z = 4.7), which hosts the most relativistic jet among known high-redshift blazars, is dominated in the high-luminosity regime (10(47) erg s(-1)), making it an ideal target for multiwavelength follow-up observations. J090630+693030 is found to have a rest-frame period of 182.46 days, and J143023+420436 has a period of 16.89 days; both could be explained by the global evolution of plasmoid chains, in which magnetic islands formed during reconnection may merge successively. |
| WOS关键词 | SPECTRAL ENERGY-DISTRIBUTION ; SUPERMASSIVE BLACK-HOLE ; RADIO-LOUD QUASAR ; LONG-TERM ; RELATIVISTIC JETS ; LUMINOUS QUASAR ; ACCRETION ; AGN ; EVOLUTION ; EMISSION |
| 资助项目 | MOST divided by National Natural Science Foundation of China (NSFC)https://doi.org/10.13039/501100001809[12233002] ; MOST divided by National Natural Science Foundation of China (NSFC)https://doi.org/10.13039/501100001809[12447179] ; MOST divided by National Natural Science Foundation of China (NSFC)https://doi.org/10.13039/501100001809[12321003] ; MOST divided by National Natural Science Foundation of China (NSFC)https://doi.org/10.13039/501100001809[12273111] ; National Natural Science Foundation of China[2020SKA0120300] ; National SKA Program of China[2021YFA0718500] ; National Key R&D Program of China |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001589614100001 |
| 出版者 | IOP Publishing Ltd |
| 资助机构 | MOST divided by National Natural Science Foundation of China (NSFC)https://doi.org/10.13039/501100001809 ; National Natural Science Foundation of China ; National SKA Program of China ; National Key R&D Program of China |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/8229]  |
| 专题 | 研究单元未命名 |
| 通讯作者 | Huang, Yong-Feng |
| 作者单位 | 1.Univ Chinese Acad Sci, Coll Astron & Space Sci, 1 Yanqihu East Rd, Beijing 101408, Peoples R China 2.Chinese Acad Sci, Purple Mt Observ, Nanjing 210023, Peoples R China 3.Chinese Acad Sci, Key Lab Dark Matter & Space Astron, Nanjing 210023, Peoples R China 4.Chinese Acad Sci, Key Lab Radio Astron & Technol, A20 Datun Rd, Beijing 100101, Peoples R China 5.Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Peoples R China 6.Xinjiang Key Lab Radio Astrophys, 150 Sci 1-St, Urumqi 830011, Peoples R China 7.Anhui Normal Univ, Dept Phys, Wuhu 241002, Peoples R China 8.Chinese Acad Sci, Xinjiang Astron Observ, 150 Sci 1-St, Urumqi 830011, Peoples R China 9.Nanjing Univ, Key Lab Modern Astron & Astrophys, Minist Educ, Nanjing, Peoples R China 10.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210023, Peoples R China |
| 推荐引用方式 GB/T 7714 | Hu, Chen-Ran,Huang, Yong-Feng,Cui, Lang,et al. Magnetic Reconnection as a Potential Driver of X-Ray Variability in Active Galactic Nuclei[J]. ASTROPHYSICAL JOURNAL,2025,992(1):12. |
| APA | Hu, Chen-Ran.,Huang, Yong-Feng.,Cui, Lang.,Zhang, Hanle.,Li, Jiang-Tao.,...&Liao, Jie.(2025).Magnetic Reconnection as a Potential Driver of X-Ray Variability in Active Galactic Nuclei.ASTROPHYSICAL JOURNAL,992(1),12. |
| MLA | Hu, Chen-Ran,et al."Magnetic Reconnection as a Potential Driver of X-Ray Variability in Active Galactic Nuclei".ASTROPHYSICAL JOURNAL 992.1(2025):12. |
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