Vol 21, No 8 (2021) / Cui

East Asian VLBI Network observations of active galactic nuclei jets: imaging with KaVA+Tianma+Nanshan

Yu-Zhu Cui, Kazuhiro Hada, Motoki Kino, Bong-Won Sohn, Jongho Park, Hyun-Wook Ro, Satoko Sawada-Satoh, Wu Jiang, Lang Cui, Mareki Honma, Zhi-Qiang Shen, Fumie Tazaki, Tao An, Ilje Cho, Guang-Yao Zhao, Xiao-Peng Cheng, Kotaro Niinuma, Kiyoaki Wajima, Ying-Kang Zhang, Noriyuki Kawaguchi, Juan-Carlos Algaba, Shoko Koyama, Tomoya Hirota, Yoshinori YONEKURA, Nobuyuki Sakai, Bo Xia, Yong-Bin Jiang, Lin-Feng Yu, Wei Gou, Ju-Yeon Hwang, Yong-Chen Jiang, Yun-Xia Sun, Dong-Kyu Jung, Hyo-Ryoung Kim, Jeong-Sook Kim, Hideyuki Kobayashi, Jee-Won Lee, Jeong-Ae Lee, Hua Zhang, Guang-Hui Li, Zhi-Qiang Xu, Peng Li, Jung-Hwan Oh, Se-Jin Oh, Chung-Sik Oh, Tomoaki Oyama, Duk-Gyoo Roh, Katsunori-M. Shibata, Wen Guo, Rong-Bing Zhao, Wei-Ye Zhong, Jin-Qing Wang, Wen-Jun Yang, Hao Yan, Jae-Hwan Yeom, Bin Li, Xiao-Fei Li, Jian-Ping Yuan, Jian Dong, Zhong Chen, Kazunori Akiyama, Keiichi Asada, Do-Young Byun, Yoshiaki Hagiwara, Jeffrey Hodgson, Tae-Hyun Jung, Kee-Tae Kim, Sang-Sung Lee, Kunwoo Yi, Qing-Hui Liu, Xiang Liu, Ru-Sen Lu, Masanori Nakamura, Sascha Trippe, Na Wang, Xue-Zheng Wang, Bo Zhang

Abstract

The East Asian Very Long Baseline Interferometry (VLBI) Network (EAVN) is a rapidly evolving international VLBI array that is currently promoted under joint efforts among China, Japan and Korea. EAVN aims at forming a joint VLBI Network by combining a large number of radio telescopes distributed over East Asian regions. After the combination of the Korean VLBI Network (KVN) and the VLBI Exploration of Radio Astrometry (VERA) into KaVA, further expansion with the joint array in East Asia is actively promoted. Here we report the first imaging results (at 22 and 43 GHz) of bright radio sources obtained with KaVA connected to Tianma 65-m and Nanshan 26-m Radio Telescopes in China. To test the EAVN imaging performance for different sources, we observed four active galactic nuclei (AGN) having different brightness and morphology. As a result, we confirmed that the Tianma 65-m Radio Telescope (TMRT) significantly enhances the overall array sensitivity, a factor of 4 improvement in baseline sensitivity and 2 in image dynamic range compared to the case of KaVA only. The addition of the Nanshan 26-m Radio Telescope (NSRT) further doubled the east-west angular resolution. With the resulting high-dynamic-range, high-resolution images with EAVN (KaVA+TMRT+NSRT), various fine-scale structures in our targets, such as the counter-jet in M87, a kink-like morphology of the 3C 273 jet and the weak emission in other sources are successfully detected. This demonstrates the powerful capability of EAVN to study AGN jets and to achieve other science goals in general. Ongoing expansion of EAVN will further enhance the angular resolution, detection sensitivity and frequency coverage of the network.

Keywords


galaxies: active — galaxies: jets — instrumentation: interferometers — radio continuum: galaxies

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DOI: https://doi.org/10.1088/1674-4527/21/8/205

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