VLBI Imaging of M81* at λ = 3.4 mm with Source-frequency Phase-referencing
文献类型：期刊论文
| 作者 | Jiang,Wu1,2,3; Shen,Zhiqiang1,2; Jiang,Dongrong1,2; Martí-Vidal,Ivan4; Kawaguchi,Noriyuki2 |
| 刊名 | The Astrophysical Journal Letters
 |
| 出版日期 | 2018-01-23 |
| 卷号 | 853期号:1 |
| 关键词 | galaxies: individual (M81) methods: data analysis techniques: interferometric |
| ISSN号 | 2041-8205 |
| DOI | 10.3847/2041-8213/aaa755 |
| 英文摘要 | Abstract We report on the first VLBI image of the M81 nucleus (M81*) at a wavelength of 3.4 mm, obtained with the source-frequency phase-referencing (SFPR) technique. Thanks to the SFPR calibration, the coherent integration time eventually could be increased by more than an order of magnitude, which enabled the detection of fringes at the level of 45 mJy beam?1 with a dynamic range higher than 130:1. This paves the way toward future millimeter/submillimeter VLBI observations of weaker sources. From the analysis of the M81* visibilities, a core size of ～50 μas at 3.4 mm was estimated. This follows the power-law relationship with wavelength, , reported previously at lower frequencies. These results constrain the core size (at 3.4 mm) to a minimum of ～80 Schwarzschild radii of M81*. |
| 语种 | 英语 |
| WOS记录号 | IOP:2041-8205-853-1-AAA755 |
| 出版者 | The American Astronomical Society |
| 源URL | [http://119.78.226.72/handle/331011/32085]  |
| 专题 | 中国科学院上海天文台 |
| 作者单位 | 1.Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, Nanjing 210008, People's Republic of China 2.Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, People's Republic of China; jiangwu@shao.ac.cn, zshen@shao.ac.cn 3.University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China 4.Onsala Space Observatory, Department of Space, Earth and Environment, Chalmers University of Technology, SE-43992 Onsala, Sweden |
| 推荐引用方式 GB/T 7714 | Jiang,Wu,Shen,Zhiqiang,Jiang,Dongrong,et al. VLBI Imaging of M81* at λ = 3.4 mm with Source-frequency Phase-referencing[J]. The Astrophysical Journal Letters,2018,853(1). |
| APA | Jiang,Wu,Shen,Zhiqiang,Jiang,Dongrong,Martí-Vidal,Ivan,&Kawaguchi,Noriyuki.(2018).VLBI Imaging of M81* at λ = 3.4 mm with Source-frequency Phase-referencing.The Astrophysical Journal Letters,853(1). |
| MLA | Jiang,Wu,et al."VLBI Imaging of M81* at λ = 3.4 mm with Source-frequency Phase-referencing".The Astrophysical Journal Letters 853.1(2018). |
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来源：上海天文台
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