East Asian VLBI Network observations of active galactic nuclei jets: Imaging with KaVA plus Tianma plus Nanshan

Cui, Yu-Zhu and Hada, Kazuhiro and Kino, Motoki and Sohn, Bong-Won and Park, Jongho and Ro, Hyun-Wook and Sawada-Satoh, Satoko and Jiang, Wu and Cui, Lang and Honma, Mareki and Shen, Zhi-Qiang and Tazaki, Fumie and An, Tao and Cho, Ilje and Zhao, Guang-Yao and Cheng, Xiao-Peng and Niinuma, Kotaro and Wajima, Kiyoaki and Zhang, Ying-Kang and Kawaguchi, Noriyuki and Algaba Marcos, Juan-Carlos and Koyama, Shoko and Hirota, Tomoya and Yonekura, Yoshinori and Sakai, Nobuyuki and Xia, Bo and Jiang, Yong-Bin and Yu, Lin-Feng and Gou, Wei and Hwang, Ju-Yeon and Jiang, Yong-Chen and Sun, Yun-Xia and Jung, Dong-Kyu and Kim, Hyo-Ryoung and Kim, Jeong-Sook and Kobayashi, Hideyuki and Lee, Jee-Won and Lee, Jeong-Ae and Zhang, Hua and Li, Guang-Hui and Xu, Zhi-Qiang and Li, Peng and Oh, Jung-Hwan and Oh, Se-Jin and Oh, Chung-Sik and Oyama, Tomoaki and Roh, Duk-Gyoo and Shibata, Katsunori-M and Guo, Wen and Zhao, Rong-Bing and Zhong, Wei-Ye and Wang, Jin-Qing and Yang, Wen-Jun and Yan, Hao and Yeom, Jae-Hwan and Li, Bin and Li, Xiao-Fei and Yuan, Jian-Ping and Dong, Jian and Chen, Zhong and Akiyama, Kazunori and Asada, Keiichi and Byun, Do-Young and Hagiwara, Yoshiaki and Hodgson, Jeffrey and Jung, Tae-Hyun and Kim, Kee-Tae and Lee, Sang-Sung and Yi, Kunwoo and Liu, Qing-Hui and Liu, Xiang and Lu, Ru-Sen and Nakamura, Masanori and Trippe, Sascha and Wang, Na and Wang, Xue-Zheng and Zhang, Bo (2021) East Asian VLBI Network observations of active galactic nuclei jets: Imaging with KaVA plus Tianma plus Nanshan. Research in Astronomy and Astrophysics, 21 (8). ISSN 1674-4527, DOI https://doi.org/10.1088/1674-4527/21/8/205.

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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.

Item Type: Article
Funders: Graduate University for Advanced Studies - Japan, Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT)
Uncontrolled Keywords: Galaxies; Active; Galaxies; Jets; Instrumentation; Interferometers; Radio continuum; Galaxies
Subjects: Q Science > QC Physics
Divisions: Faculty of Science
Depositing User: Ms Zaharah Ramly
Date Deposited: 23 Aug 2022 06:16
Last Modified: 26 Aug 2022 01:04
URI: http://eprints.um.edu.my/id/eprint/34688

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