Overview of the Observing System and Initial Scientific Accomplishments of the East Asian VLBI Network (EAVN)
Overview of the Observing System and Initial Scientific Accomplishments of the East Asian VLBI Network (EAVN)
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东亚VLBI网络（EAVN）观测系统概况及初步科学成就
作者：
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;We
东亚VLBI网络（East Asian VLBI Network，简称EAVN）是东亚地区的一个国际VLBI设施，在东亚国家以及部分东南亚和欧洲国家之间相互合作下运行。EAVN目前由位于中国、日本和韩国的16台射电望远镜和3台射电望远镜组成，主要在6.7、22和43 GHz三个频段工作，最长基线长度为5078 km，在43 GHz处的最高角分辨率为0.28毫角秒。EAVN的独特功能之一是在9台望远镜上同时接收多频数据，这使我们能够采用频率相位转移技术在更高的观测频率下获得更好的灵敏度。EAVN于2018年下半年开始开放使用计划，一年内提供超过1100小时的总观测时间。EAVN填补了全球VLBI阵列的地理空白，使我们能够进行连续的高分辨率VLBI观测。EAVN已经取得了各种科学成就，特别是在对活动星系核，演化恒星和恒星形成区的观测方面。这些活动促使我们发起成立“全球VLBI联盟”，以提供一个机会，VLBI观测与地球上最长的基线。
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.