VLBI Imaging of M81*at gimel=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; Marti-Vidal, Ivan4; Kawaguchi, Noriyuki1 |
| 刊名 | ASTROPHYSICAL JOURNAL LETTERS
 |
| 出版日期 | 2018-01-20 |
| 卷号 | 853期号:1页码:6 |
| 关键词 | galaxies: individual (M81) methods: data analysis techniques: interferometric |
| ISSN号 | 2041-8205 |
| DOI | 10.3847/2041-8213/aaa755 |
| 通讯作者 | Jiang, Wu(jiangwu@shao.ac.cn) |
| 英文摘要 | 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 similar to 50 mu as at 3.4 mm was estimated. This follows the power-law relationship with wavelength, alpha lambda(0.88), reported previously at lower frequencies. These results constrain the core size (at 3.4 mm) to a minimum of similar to 80 Schwarzschild radii of M81*. |
| WOS关键词 | ACTIVE GALACTIC NUCLEI ; RADIO-SOURCES ; M81 ; CORE ; JET |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000423333500003 |
| 出版者 | IOP PUBLISHING LTD |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/22235]  |
| 专题 | 中国科学院紫金山天文台 |
| 通讯作者 | Jiang, Wu |
| 作者单位 | 1.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 2.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Jiangsu, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Chalmers Univ Technol, Onsala Space Observ, Dept Space Earth & Environm, 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 gimel=3.4 mm with Source-frequency Phase-referencing[J]. ASTROPHYSICAL JOURNAL LETTERS,2018,853(1):6. |
| APA | Jiang, Wu,Shen, Zhiqiang,Jiang, Dongrong,Marti-Vidal, Ivan,&Kawaguchi, Noriyuki.(2018).VLBI Imaging of M81*at gimel=3.4 mm with Source-frequency Phase-referencing.ASTROPHYSICAL JOURNAL LETTERS,853(1),6. |
| MLA | Jiang, Wu,et al."VLBI Imaging of M81*at gimel=3.4 mm with Source-frequency Phase-referencing".ASTROPHYSICAL JOURNAL LETTERS 853.1(2018):6. |
入库方式： OAI收割
来源：紫金山天文台
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