EP241021a: A Months-duration X-Ray Transient with Luminous Optical and Radio Emission
文献类型：期刊论文
| 作者 | Shu, Xinwen46; Yang, Lei46; Yang, Haonan45; Xu, Fan46; Chen, Jin-Hong44; Eyles-Ferris, Rob A. J.43; Dai, Lixin44; Yu, Yunwei42; Shen, Rong-Feng41; Sun, Luming46 |
| 刊名 | ASTROPHYSICAL JOURNAL LETTERS
 |
| 出版日期 | 2025-09-01 |
| 卷号 | 990期号:1页码:L29 |
| ISSN号 | 2041-8205 |
| DOI | 10.3847/2041-8213/adf4cd |
| 产权排序 | 34 |
| 英文摘要 | We present the discovery of a peculiar X-ray transient, EP241021a, by the Einstein Probe (EP) mission and the results from multiwavelength follow-up observations. The transient was first detected with the Wide-field X-ray Telescope as an intense flare lasting for similar to 100 s, reaching a luminosity of L0.5-4 keV approximate to 10(48) erg s(-1). Further observations with EP's Follow-up X-ray Telescope reveal a huge drop in the X-ray flux by a factor of >1000 within 1.5 days. After maintaining a nearly plateau phase for similar to 7 days, the X-ray flux decreases proportional to t(-1.2) over a period of similar to 30 days, followed by a sudden decrease to an undetectable level by EP and XMM-Newton, making it the longest afterglow emission detected among known fast X-ray transients. Bright counterparts at optical and radio wavelengths were also detected, with high peak luminosities in excess of 10(44) erg s(-1) and 10(41) erg s(-1), respectively. In addition, EP241021a exhibits a nonthermal X-ray spectrum, red optical color, X-ray and optical rebrightenings in the light curves, and fast radio spectral evolution, suggesting that relativistic jets may have been launched. We discuss the possible origins of EP241021a, including a choked jet with supernova shock breakout, a merger-triggered magnetar, a highly structured jet, and a repeating partial tidal disruption event involving an intermediate-mass black hole, but none can perfectly explain the multiwavelength properties. EP241021a may represent a new type of X-ray transient with month-duration evolution timescales; future EP detections and follow-up observations of similar systems will provide statistical samples to understand the underlying mechanisms at work. |
| WOS关键词 | DISRUPTION EVENT AT2022CMC ; TIDAL DISRUPTION ; EINSTEIN PROBE ; SWIFT J1644+57 ; BURST ; JET ; AFTERGLOW ; STAR ; SUPERNOVA ; DISCOVERY |
| 资助项目 | National Science Foundation China (NSFC) ; Strategic Priority Program on Space Science of the Chinese Academy of Sciences[XDA15310000] ; CNES[XDB0550200] ; Strategic Priority Research Program of the Chinese Academy of Sciences[2022YFF0711500] ; National Key R&D Program of China |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001566195100001 |
| 出版者 | IOP Publishing Ltd |
| 资助机构 | National Science Foundation China (NSFC) ; Strategic Priority Program on Space Science of the Chinese Academy of Sciences ; CNES ; Strategic Priority Research Program of the Chinese Academy of Sciences ; National Key R&D Program of China |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/8118]  |
| 专题 | 研究单元未命名 |
| 通讯作者 | Shu, Xinwen |
| 作者单位 | 1.Univ Malaga, Escuela Ingn Ind, Unidad Asociada CSIC IAA, Ingn Sistemas & Automat, Arquitecto Francisco Penalosa 6, Campanillas 29071, Malaga, Spain 2.Sorbonne Univ, Inst Astrophys Paris, CNRS, UMR 7095, 98 Bis Bd Arago, F-75014 Paris, France 3.CEA Paris Saclay, Dept Astrophys, Irfu, F-9111 Gif Sur Yvette, France 4.Tsinghua Univ, Phys Dept, Beijing 100084, Peoples R China 5.Univ Hertfordshire, Ctr Astrophys Res, Hatfield AL10 9AB, England 6.Chinese Acad Sci, Key Lab Dark Matter & Space Astron, Purple Mt Observ, Nanjing 210023, Peoples R China 7.Adler Planetarium, 1300 South Dusable Lake Shore Dr, Chicago, IL 60605 USA 8.Chinese Acad Sci, Shanghai Inst Tech Phys, Shanghai 200083, Peoples R China 9.Univ Cape Town, Interuniv Inst Data Intens Astron IDIA, Dept Astron, ZA-7701 Rondebosch, Cape Town, South Africa 10.Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA |
| 推荐引用方式 GB/T 7714 | Shu, Xinwen,Yang, Lei,Yang, Haonan,et al. EP241021a: A Months-duration X-Ray Transient with Luminous Optical and Radio Emission[J]. ASTROPHYSICAL JOURNAL LETTERS,2025,990(1):L29. |
| APA | Shu, Xinwen.,Yang, Lei.,Yang, Haonan.,Xu, Fan.,Chen, Jin-Hong.,...&Daigne, Frederic.(2025).EP241021a: A Months-duration X-Ray Transient with Luminous Optical and Radio Emission.ASTROPHYSICAL JOURNAL LETTERS,990(1),L29. |
| MLA | Shu, Xinwen,et al."EP241021a: A Months-duration X-Ray Transient with Luminous Optical and Radio Emission".ASTROPHYSICAL JOURNAL LETTERS 990.1(2025):L29. |
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