Jet reorientation revealed by intermittent jet activity in radio galaxy 0954+556
文献类型：期刊论文
| 作者 | Zeng, Ai-Ling8,9,10; Zhao, Wei7,10; Yang, Jun6; Hu, Xu-Zhi5; Deng, Furen4,7; Lei, Yu7,10; Hong, Xiaoyu7,9,10; Liu, Xiang1,7; Chen, Liang7,10; Liao, Mai2,3,4 |
| 刊名 | ASTRONOMY & ASTROPHYSICS
 |
| 出版日期 | 2026-01-09 |
| 卷号 | 705页码:A85 |
| 关键词 | instrumentation: high angular resolution techniques: interferometric galaxies: active galaxies: jets |
| ISSN号 | 0004-6361 |
| DOI | 10.1051/0004-6361/202453625 |
| 产权排序 | 8 |
| 英文摘要 | Context. Intermittent jet activity of active galactic nuclei (AGNs) is a common phenomenon, whereas significant jet reorientation during episodic jet activity in relatively young radio galaxies is rarely reported. The quasar 0954+556 at z = 0.903 is an intriguing source exhibiting an unusual radio jet structure with significantly different jet directions at kiloparsec (kpc) and parsec (pc) scales. At kpc scales, images from the Very Large Array (VLA) exhibit a bright core, a linear jet extending similar to 24 kpc to the northwest, and a discrete jet component similar to 16 kpc to the northeast. At pc scales, images from the Very Long Baseline Array (VLBA) show a two-component structure with a projected separation of similar to 360 pc in the north-south direction. Aims. The peculiar structure of 0954+556 might result from jet reorientation. Here, our aim was to investigate the possible mechanism via multiscale and multifrequency deep radio images. Methods. We performed VLA and VLBA observations of 0954+556. Together with some existing data in the NRAO data archive, we made multiple VLA images at 1.4-22 GHz and VLBA images at 1.7-43 GHz for various image analyses of the jet structure. Results. We identified the location of the radio core at pc scales, detected the faint counter-jets at both pc and kpc scales for the first time, and revealed a diffuse emission region connecting pc- and kpc-scale forward jets. Our spectral index distribution and spectral aging analysis indicate that 0954+556 might undergo at least two episodes of jet activity during the current AGN phase. Moreover, pc-scale polarization maps display a well-resolved spine-sheath polarization structure. Conclusions. It seems that the jet direction of 0954+556 changed significantly during intermittent jet activity. This may explain the different jet orientations and spectral ages observed from kpc to pc scales. The research provides a strong case that AGN jet direction might change rapidly on timescales of one million years. |
| WOS关键词 | MULTIFREQUENCY VLBA OBSERVATIONS ; SHEATH POLARIZATION STRUCTURES ; COMPACT STEEP-SPECTRUM ; GALACTIC NUCLEI ; MAGNETIC-FIELD ; ACCRETION DISK ; DATA RELEASE ; VARIABILITY PROPERTIES ; INTERACTIVE PROGRAM ; QUASAR 1604+159 |
| 资助项目 | National Key R&D Program of China[2018YFA0404602] ; National Aeronautics and Space Administration |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001658556200017 |
| 出版者 | EDP SCIENCES S A |
| 资助机构 | National Key R&D Program of China ; National Aeronautics and Space Administration |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/8465]  |
| 专题 | 星系宇宙学研究团组 |
| 通讯作者 | Zeng, Ai-Ling |
| 作者单位 | 1.Chinese Acad Sci, Xinjiang Astron Observ, 150 Sci-1 St, Urumqi 830011, Peoples R China 2.Univ Diego Portales, Inst Estudios Astrofis, Fac Ingn & Ciencias, Av Ejercito 441, Santiago, Chile 3.Chinese Acad Sci, Chinese Acad Sci, Natl Astron Observ, South Amer Ctr Astron, Beijing 100101, Peoples R China 4.Chinese Acad Sci, Natl Astron Observ, Beijing 100101, Peoples R China 5.Yunnan Univ, Sch Phys & Astron, Kunming 650500, Peoples R China 6.Chalmers Univ Technol, Dept Space Earth & Environm, Onsala Space Observ, SE-43992 Onsala, Sweden 7.Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 100049, Peoples R China 8.CSIC, Inst Astrofis Andalucia, Glorieta Astron S-N, E-18008 Granada, Spain 9.ShanghaiTech Univ, Sch Phys Sci & Technol, Shanghai 201210, Peoples R China 10.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zeng, Ai-Ling,Zhao, Wei,Yang, Jun,et al. Jet reorientation revealed by intermittent jet activity in radio galaxy 0954+556[J]. ASTRONOMY & ASTROPHYSICS,2026,705:A85. |
| APA | Zeng, Ai-Ling.,Zhao, Wei.,Yang, Jun.,Hu, Xu-Zhi.,Deng, Furen.,...&Shang, Hai-Tian.(2026).Jet reorientation revealed by intermittent jet activity in radio galaxy 0954+556.ASTRONOMY & ASTROPHYSICS,705,A85. |
| MLA | Zeng, Ai-Ling,et al."Jet reorientation revealed by intermittent jet activity in radio galaxy 0954+556".ASTRONOMY & ASTROPHYSICS 705(2026):A85. |
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来源：新疆天文台
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