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作者单位: | Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai, 200030, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Osserv Astron Brera, Ist Nazl Astrofis, Via E Bianchi 46, Merate, I-23807, Italy; Ist Nazl Astrofis, Ist Radioastron, Bologna, I40129, Italy; Department of Physics and Astronomy, University of Bologna, Bologna, I40129, Italy; National Astronomical Observatory of Japan, Tokyo, 181-8588, Japan; Korea Astronomy and Space Science Institute, Daejeon, 34055, South Korea; Key laboratory of Radio Astronomy, Chinese Academy of Sciences, Nanjing, 210008, China
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