Identifying compact symmetric objects with high-precision VLBI and Gaia astrometry
文献类型：期刊论文
| 作者 | An, T.1,7; Zhang, Y.1,7; Frey, S.4,5,6; Baan, W. A.2,3,7; Wang, A.7 |
| 刊名 | ASTRONOMY & ASTROPHYSICS
 |
| 出版日期 | 2025-12-05 |
| 卷号 | 704页码:A93 |
| 关键词 | astrometry galaxies: active galaxies: jets galaxies: nuclei quasars: general |
| ISSN号 | 0004-6361 |
| DOI | 10.1051/0004-6361/202554322 |
| 产权排序 | 6 |
| 英文摘要 | Context. Compact symmetric objects (CSOs) trace the earliest phases of radio-galaxy growth; however, robust classification is difficult when radio cores are weak or invisible. Aims. We aim to develop and test a Gaia+VLBI approach that utilizes the high-precision optical astrometry of Gaia together with the high-resolution imaging of very long baseline interferometry (VLBI) to reliably locate the central engine and classify CSOs. Methods. We analysed 40 literature CSO candidates by overlaying Gaia Data Release 3 (DR3) positions on VLBI maps and by examining spectral index distributions, whole-source variability, and hotspot kinematics over up to 25 years. A source is classified as a CSO when the Gaia centroid lies between two steep-spectrum lobes; alignment with one end of the radio structure indicates a core-jet source. Results. Our method yields 20 confirmed CSOs, ten core-jet sources, and ten ambiguous cases affected by significant optical-radio positional offsets or limited data. The confirmed CSOs show low integrated variability, hotspot advance speeds typically < 0.5 c, where c denotes the speed of light (with a few mildly relativistic cases), and kinematic ages of approximate to 20 - 2000 yr. Five nearby CSOs show systematic Gaia-VLBI offsets despite the CSO-like morphology, likely reflecting host-galaxy environments and Gaia astrometric systematics. We find a clear dichotomy with radio power: high-power CSOs (P1.4 GHz > 1026.5 W Hz-1) tend to be larger and host faster hotspots, while many low-power systems remain sub-kiloparsec and environmentally confined. Conclusions.Gaia+VLBI registration is a powerful method for CSO classification, especially where radio cores are faint. The observed power-size-velocity-age relations support distinct multiple evolutionary tracks, with high-power CSOs plausibly growing into large radio galaxies, while low-power CSOs appear confined by their host galaxy environments. Taken together, our results indicate that CSO evolution is shaped not only by intrinsic jet power, but also by host-galaxy environment and the duty cycle of the central engine. High-sensitivity observations of low-power CSOs will be crucial to map the full diversity of formation channels and evolutionary pathways of radio galaxies |
| WOS关键词 | ACTIVE GALACTIC NUCLEI ; DOUBLE RADIO GALAXIES ; RELATIVISTIC JET FEEDBACK ; DOUBLE-DOUBLE MORPHOLOGY ; HIGH-REDSHIFT QUASARS ; STEEP-SPECTRUM ; SKY SURVEY ; TIDAL DISRUPTION ; BLACK-HOLES ; LOUD AGN |
| 资助项目 | National Key R&D Program of China[2022SKA0120102] ; Ministry of Science and Technology of the People's Republic of China ; Chinese Academy of Sciences ; Xinjiang Tianchi Talent Program ; China Scholarship Council[202104910165] ; Shanghai Sailing Program[22YF1456100] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDA0350205] ; Hungarian National Research, Development and Innovation Office (NKFIH)[OTKA K134213] ; NKFIH excellence grant[TKP2021-NKTA-64] ; National Aeronautics and Space Administration |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001631850200035 |
| 出版者 | EDP SCIENCES S A |
| 资助机构 | National Key R&D Program of China ; Ministry of Science and Technology of the People's Republic of China ; Chinese Academy of Sciences ; Xinjiang Tianchi Talent Program ; China Scholarship Council ; Shanghai Sailing Program ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Hungarian National Research, Development and Innovation Office (NKFIH) ; NKFIH excellence grant ; National Aeronautics and Space Administration |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/8441]  |
| 专题 | 恒星形成与演化研究团组 |
| 通讯作者 | An, T. |
| 作者单位 | 1.State Key Lab Radio Astron & Technol, A20 Datun Rd, Chaoyang Dist, Beijing, Peoples R China 2.Netherlands Inst Radio Astron, ASTRON, Oude Hoogeveensedijk 4, NL-7991 PD Dwingeloo, Netherlands 3.Chinese Acad Sci, Xinjiang Astron Observ, 150 Sci-1 St, Urumqi 830011, Xinjiang, Peoples R China 4.Eotvos Lorand Univ, Inst Phys & Astron, Pazmany Peter setany 1-A, H-1117 Budapest, Hungary 5.MTA Ctr Excellence, CSFK, Konkoly Thege Mikl ut 15-17, H-1121 Budapest, Hungary 6.HUN REN Res Ctr Astron & Earth Sci, Konkoly Observ, Konkoly Thege Mikl ut 15-17, H-1121 Budapest, Hungary 7.Chinese Acad Sci, Key Lab Radio Astron, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China |
| 推荐引用方式 GB/T 7714 | An, T.,Zhang, Y.,Frey, S.,et al. Identifying compact symmetric objects with high-precision VLBI and Gaia astrometry[J]. ASTRONOMY & ASTROPHYSICS,2025,704:A93. |
| APA | An, T.,Zhang, Y.,Frey, S.,Baan, W. A.,&Wang, A..(2025).Identifying compact symmetric objects with high-precision VLBI and Gaia astrometry.ASTRONOMY & ASTROPHYSICS,704,A93. |
| MLA | An, T.,et al."Identifying compact symmetric objects with high-precision VLBI and Gaia astrometry".ASTRONOMY & ASTROPHYSICS 704(2025):A93. |
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来源：新疆天文台
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