Intra-Day Variability Observations of Two Dozens of Blazars at 4.8 GHz
文献类型：期刊论文
| 作者 | Liu, Xiang1,2,3 ; Wang, Xin1,4; Chang, Ning1,4; Liu, Jun5; Cui, Lang1,2; Yang, Xiaofeng1,2; Krichbaum, Thomas P.5
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| 刊名 | UNIVERSE
 |
| 出版日期 | 2021 |
| 卷号 | 7期号:1页码:15 |
| 关键词 | quasars general galaxies jets radio continuum galaxies ISM structure scattering |
| DOI | 10.3390/universe7010015 |
| 产权排序 | 1 |
| 英文摘要 | Two dozens of radio loud active galactic nuclei (AGNs) have been observed with Urumqi 25 m radio telescope in order to search for intra-day variability (IDV). The target sources are blazars (namely flat spectrum radio quasars and BL Lac objects) which are mostly selected from the observing list of RadioAstron AGN monitoring campaigns. The observations were carried out at 4.8 GHz in two sessions of 8-12 February 2014 and 7-9 March respectively. We report the data reduction and the first results of observations. The results show that the majority of the blazars exhibit IDV in 99.9% confidence level, some of them show quite strong IDV. We find the strong IDV of blazar 1357 + 769 for the first time. The IDV at centimeter-wavelength is believed to be predominately caused by the scintillation of blazar emission through the local interstellar medium in a few hundreds parsecs away from Sun. No significant correlation between the IDV strength and either redshift or Galactic latitude is found in our sample. The IDV timescale along with source structure and brightness temperature analysis will be presented in a forthcoming paper. |
| 资助项目 | National Key R&D Program of China[2018YFA0404602] ; Xiaofeng Yang's Xinjiang Tianchi Bairen project ; CAS Pioneer Hundred Talents Program ; CAS `Light of West China' Program[2018-XBQNXZ-B-021] ; NSFC[U2031212] ; NSFC[61931002] ; Youth Innovation Promotion Association of the CAS[2017084] |
| WOS研究方向 | Astronomy & Astrophysics ; Physics |
| 语种 | 英语 |
| 出版者 | MDPI |
| WOS记录号 | WOS:000610737800001 |
| 资助机构 | National Key R&D Program of China ; Xiaofeng Yang's Xinjiang Tianchi Bairen project ; CAS Pioneer Hundred Talents Program ; CAS `Light of West China' Program ; NSFC ; Youth Innovation Promotion Association of the CAS |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/3838]  |
| 专题 | 星系宇宙学研究团组 射电天文研究室_利用南山26米射电望远镜观测数据的文章 |
| 通讯作者 | Liu, Xiang |
| 作者单位 | 1.Chinese Acad Sci, Xinjiang Astron Observ, 150 Sci 1 St, Urumqi 830011, Peoples R China 2.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Peoples R China 3.Qiannan Normal Univ Nationalities, Phys & Astron Dept, Duyun 558000, Peoples R China 4.Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 100049, Peoples R China 5.Max Plank Inst Radioastron, Hugel 69, D-53121 Bonn, Germany |
| 推荐引用方式 GB/T 7714 | Liu, Xiang,Wang, Xin,Chang, Ning,et al. Intra-Day Variability Observations of Two Dozens of Blazars at 4.8 GHz[J]. UNIVERSE,2021,7(1):15. |
| APA | Liu, Xiang.,Wang, Xin.,Chang, Ning.,Liu, Jun.,Cui, Lang.,...&Krichbaum, Thomas P..(2021).Intra-Day Variability Observations of Two Dozens of Blazars at 4.8 GHz.UNIVERSE,7(1),15. |
| MLA | Liu, Xiang,et al."Intra-Day Variability Observations of Two Dozens of Blazars at 4.8 GHz".UNIVERSE 7.1(2021):15. |
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