High-Frequency and High-Resolution VLBI Observations of GHz Peaked Spectrum Objects
文献类型:期刊论文
作者 | Cheng, Xiaopeng2; An, Tao3,4; Wang, Ailing1,3; Jaiswal, Sumit3 |
刊名 | Galaxies
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出版日期 | 2023-03-01 |
卷号 | 11页码:42 |
关键词 | galaxies active evolution radio continuum Astrophysics - High Energy Astrophysical Phenomena |
ISSN号 | 2075-4434 |
DOI | 10.3390/galaxies11020042 |
产权排序 | 3 |
英文摘要 | Observational studies of GHz peaked spectrum (GPS) sources contribute to the understanding of the radiative properties and interstellar environment of host galaxies. We present the results from the multi-frequency high-resolution VLBI observations of a sample of nine GPS sources at 8, 15, and 43 GHz. All sources show core-jet structure. Four sources show relativistic jets with Doppler boosting factors ranging from 2.0 to 5.0 and a jet viewing angle between 10° and 30°. The core brightness temperatures of the other five sources are below the equipartition brightness temperature limit with their jet viewing angles in the range of 13.6° to 71.9°, which are systematically larger than those of relativistic jets in this sample. The sources show diverse variability properties, with variability levels ranging from 0.11 to 0.56. The measured turnover frequency in the radio spectrum ranges from 6.2 and 31.8 GHz (in the source's rest frame). We estimate the equipartition magnetic field strength to be between 9 and 48 mG. These results strongly support the notion that these GPS sources are young radio sources in the very early stage of their evolution. |
URL标识 | 查看原文 |
语种 | 英语 |
源URL | [http://ir.xao.ac.cn/handle/45760611-7/6639] ![]() |
专题 | 研究单元未命名 |
作者单位 | 1.University of Chinese Academy of Sciences, 19A Yuquanlu, Beijing 100049, China 2.Korea Astronomy and Space Science Institute, 776 Daedeok-daero, Yuseong-gu, Daejeon 34055, Republic of Korea; 3.Shanghai Astronomical Observatory, Chinese Academy of Sciences, Nandan Road 80, Shanghai 200030, China; 4.Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi 830011, China; |
推荐引用方式 GB/T 7714 | Cheng, Xiaopeng,An, Tao,Wang, Ailing,et al. High-Frequency and High-Resolution VLBI Observations of GHz Peaked Spectrum Objects[J]. Galaxies,2023,11:42. |
APA | Cheng, Xiaopeng,An, Tao,Wang, Ailing,&Jaiswal, Sumit.(2023).High-Frequency and High-Resolution VLBI Observations of GHz Peaked Spectrum Objects.Galaxies,11,42. |
MLA | Cheng, Xiaopeng,et al."High-Frequency and High-Resolution VLBI Observations of GHz Peaked Spectrum Objects".Galaxies 11(2023):42. |
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来源:新疆天文台
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