Evidence of Long-lived Powerful Gyrosynchrotron Radio Emission in the Close Binary FF Uma
文献类型：期刊论文
| 作者 | Gao, Ruijie1; Yang, Jun2; Gao, Yang3; Zhang, Jingdong4,5; Zhang, Bo4; Chen W(陈文)6; Sun, Xiaohui1; Gao GN(高冠男)6,7; Dai ZB(戴智斌)6,8; Carozzi, Tobia D.2 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2026-04-10 |
| 卷号 | 1001期号:1 |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/ae5629 |
| 产权排序 | 第6完成单位 |
| 文献子类 | Article |
| 英文摘要 | RS Canum Venaticorum (RS CVn) close binaries, characterized by tidal locking, rapid rotations, and strong magnetic fields, are ideal laboratories for high-resolution radio observations to probe emission processes, magnetic field configurations, and interaction activity. Despite their importance, only a few RSCVn sources have been explored by polarimetric observations of very long baseline interferometry. To expand the effort, we have analyzed the existing Very Long Baseline Array (VLBA) astrometric data for the RS CVn binary FF Ursae Majoris. In the 5 GHz VLBA experiments conducted between 2021 and 2024, both total intensity and circularly polarized emission were clearly detected at six of seven epochs. The consistently high brightness temperatures (>= 107 K) and the moderate fractional circular polarization (10%-30%) over about 3 yr indicate that the radio emission is mainly produced by gyrosynchrotron radiation from mildly relativistic electrons in the highly ordered magnetic field. The radio luminosities are also comparable to those of previously studied powerful RS CVn binaries and show a significant anticorrelation with fractional circular polarization. A mean centroid offset of 13.4 +/- 3.1 R circle dot between the Stokes I and V emission was found across multiple epochs, indicating a possible additional contribution from the secondary star via a magnetically active corona, a giant magnetic loop, or significant interaction activity with the primary star in the quiescent state. |
| 学科主题 | 天文学 ; 恒星与银河系 ; 射电天文学 |
| URL标识 | 查看原文 |
| 出版地 | No.2 The Distillery, Glassfields, Avon Street, Bristol, ENGLAND |
| WOS关键词 | RS-CANUM-VENATICORUM ; VLBI ASTROMETRY ; CVN BINARIES ; SKY SURVEY ; CIRCULAR-POLARIZATION ; ORBITAL PERIOD ; UX-ARIETIS ; LINK RADIO ; VLA SURVEY ; X-RAY |
| 资助项目 | National SKA Program of China[2022SKA0120101] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001735302500001 |
| 出版者 | IOP Publishing Ltd |
| 资助机构 | National SKA Program of China[2022SKA0120101] |
| 版本 | 出版稿 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/29134]  |
| 专题 | 云南天文台_双星与变星研究组 |
| 通讯作者 | Gao, Ruijie |
| 作者单位 | 1.School of Physics and Astronomy, Yunnan University, Kunming 650091, People’s Republic of China; ruijiegz@gmail.com, xhsun@ynu.edu.cn; 2.Department of Space, Earth and Environment, Chalmers University of Technology, Onsala Space Observatory, 43992, Onsala, Sweden; jun.yang@chalmers.se; 3.School of Physics and Astronomy, Sun Yat-Sen University, Zhuhai 519082, Guangdong, People’s Republic of China; 4.Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai, People’s Republic of China; 5.Department of Geodesy and Geodynamics, Finnish Geospatial Research Institute (FGI), National Land Survey of Finland, Vuorimiehentie 5, Espoo 02150, Finland; 6.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, Yunnan, People’s Republic of China; 7.Yunnan Key Laboratory of the Solar Physics and Space Science, Kunming 650216, People’s Republic of China; 8.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650216, People’s Republic of China |
| 推荐引用方式 GB/T 7714 | Gao, Ruijie,Yang, Jun,Gao, Yang,et al. Evidence of Long-lived Powerful Gyrosynchrotron Radio Emission in the Close Binary FF Uma[J]. ASTROPHYSICAL JOURNAL,2026,1001(1). |
| APA | Gao, Ruijie.,Yang, Jun.,Gao, Yang.,Zhang, Jingdong.,Zhang, Bo.,...&Carozzi, Tobia D..(2026).Evidence of Long-lived Powerful Gyrosynchrotron Radio Emission in the Close Binary FF Uma.ASTROPHYSICAL JOURNAL,1001(1). |
| MLA | Gao, Ruijie,et al."Evidence of Long-lived Powerful Gyrosynchrotron Radio Emission in the Close Binary FF Uma".ASTROPHYSICAL JOURNAL 1001.1(2026). |
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来源：云南天文台
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