Galaxies (Dec 2022)

Overview of the Observing System and Initial Scientific Accomplishments of the East Asian VLBI Network (EAVN)

  • Kazunori Akiyama,
  • Juan-Carlos Algaba,
  • Tao An,
  • Keiichi Asada,
  • Kitiyanee Asanok,
  • Do-Young Byun,
  • Thanapol Chanapote,
  • Wen Chen,
  • Zhong Chen,
  • Xiaopeng Cheng,
  • James O. Chibueze,
  • Ilje Cho,
  • Se-Hyung Cho,
  • Hyun-Soo Chung,
  • Lang Cui,
  • Yuzhu Cui,
  • Akihiro Doi,
  • Jian Dong,
  • Kenta Fujisawa,
  • Wei Gou,
  • Wen Guo,
  • Kazuhiro Hada,
  • Yoshiaki Hagiwara,
  • Tomoya Hirota,
  • Jeffrey A. Hodgson,
  • Mareki Honma,
  • Hiroshi Imai,
  • Phrudth Jaroenjittichai,
  • Wu Jiang,
  • Yongbin Jiang,
  • Yongchen Jiang,
  • Takaaki Jike,
  • Dong-Kyu Jung,
  • Taehyun Jung,
  • Noriyuki Kawaguchi,
  • Dong-Jin Kim,
  • Hyo-Ryoung Kim,
  • Jaeheon Kim,
  • Jeong-Sook Kim,
  • Kee-Tae Kim,
  • Soon-Wook Kim,
  • Motoki Kino,
  • Hideyuki Kobayashi,
  • Shoko Koyama,
  • Busaba H. Kramer,
  • Jee-Won Lee,
  • Jeong Ae Lee,
  • Sang-Sung Lee,
  • Sang Won Lee,
  • Bin Li,
  • Guanghui Li,
  • Xiaofei Li,
  • Zhixuan Li,
  • Qinghui Liu,
  • Xiang Liu,
  • Ru-Sen Lu,
  • Kazuhito Motogi,
  • Masanori Nakamura,
  • Kotaro Niinuma,
  • Chungsik Oh,
  • Hongjong Oh,
  • Junghwan Oh,
  • Se-Jin Oh,
  • Tomoaki Oyama,
  • Jongho Park,
  • Saran Poshyachinda,
  • Hyunwook Ro,
  • Duk-Gyoo Roh,
  • Wiphu Rujopakarn,
  • Nobuyuki Sakai,
  • Satoko Sawada-Satoh,
  • Zhi-Qiang Shen,
  • Katsunori M. Shibata,
  • Bong Won Sohn,
  • Boonrucksar Soonthornthum,
  • Koichiro Sugiyama,
  • Yunxia Sun,
  • Mieko Takamura,
  • Yoshihiro Tanabe,
  • Fumie Tazaki,
  • Sascha Trippe,
  • Kiyoaki Wajima,
  • Jinqing Wang,
  • Na Wang,
  • Shiqiang Wang,
  • Xuezheng Wang,
  • Bo Xia,
  • Shuangjing Xu,
  • Hao Yan,
  • Wenjun Yang,
  • Jae-Hwan Yeom,
  • Kunwoo Yi,
  • Sang-Oh Yi,
  • Yoshinori Yonekura,
  • Hasu Yoon,
  • Linfeng Yu,
  • Jianping Yuan,
  • Youngjoo Yun,
  • Bo Zhang,
  • Hua Zhang,
  • Yingkang Zhang,
  • Guang-Yao Zhao,
  • Rongbing Zhao,
  • Weiye Zhong,
  • on behalf of the East Asian VLBI Network Collaboration

DOI
https://doi.org/10.3390/galaxies10060113
Journal volume & issue
Vol. 10, no. 6
p. 113

Abstract

Read online

The East Asian VLBI Network (EAVN) is an international VLBI facility in East Asia and is operated under mutual collaboration between East Asian countries, as well as part of Southeast Asian and European countries. EAVN currently consists of 16 radio telescopes and three correlators located in China, Japan, and Korea, and is operated mainly at three frequency bands, 6.7, 22, and 43 GHz with the longest baseline length of 5078 km, resulting in the highest angular resolution of 0.28 milliarcseconds at 43 GHz. One of distinct capabilities of EAVN is multi-frequency simultaneous data reception at nine telescopes, which enable us to employ the frequency phase transfer technique to obtain better sensitivity at higher observing frequencies. EAVN started its open-use program in the second half of 2018, providing a total observing time of more than 1100 h in a year. EAVN fills geographical gap in global VLBI array, resulting in enabling us to conduct contiguous high-resolution VLBI observations. EAVN has produced various scientific accomplishments especially in observations toward active galactic nuclei, evolved stars, and star-forming regions. These activities motivate us to initiate launch of the ’Global VLBI Alliance’ to provide an opportunity of VLBI observation with the longest baselines on the earth.

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