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VLBI Imaging of M81*at gimel=3.4 mm with Source-frequency Phase-referencing
Jiang, Wu1,2,3; Shen, Zhiqiang1,2; Jiang, Dongrong1,2; Marti-Vidal, Ivan4; Kawaguchi, Noriyuki1
2018-01-20
Source PublicationASTROPHYSICAL JOURNAL LETTERS
ISSN2041-8205
Volume853Issue:1Pages:6
Corresponding AuthorJiang, Wu(jiangwu@shao.ac.cn)
AbstractWe 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*.
Keywordgalaxies: individual (M81) methods: data analysis techniques: interferometric
DOI10.3847/2041-8213/aaa755
WOS KeywordACTIVE GALACTIC NUCLEI ; RADIO-SOURCES ; M81 ; CORE ; JET
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000423333500003
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/22236
Collection中国科学院紫金山天文台
Corresponding AuthorJiang, Wu
Affiliation1.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
Recommended Citation
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.
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