VLBI observations of bright AGN jets with the KVN and VERA Array (KaVA): Evaluation of imaging capability

Kotaro Niinuma, Sang Sung Lee, Motoki Kino, Bong Won Sohn, Kazunori Akiyama, Guang Yao Zhao, Satoko Sawada-Satoh, Sascha Trippe, Kazuhiro Hada, Taehyun Jung, Yoshiaki Hagiwara, Richard Dodson, Shoko Koyama, Mareki Honma, Hiroshi Nagai, Aeree Chung, Akihiro Doi, Kenta Fujisawa, Myoung Hee Han, Joeng Sook KimJeewon Lee, Jeong Ae Lee, Atsushi Miyazaki, Tomoaki Oyama, Kazuo Sorai, Kiyoaki Wajima, Jaehan Bae, Do Young Byun, Se Hyung Cho, Yoon Kyung Choi, Hyunsoo Chung, Moon Hee Chung, Seog Tae Han, Tomoya Hirota, Jung Wook Hwang, Do Heung Je, Takaaki Jike, Dong Kyu Jung, Jin Seung Jung, Ji Hyun Kang, Jiman Kang, Yong Woo Kang, Yukitoshi Kan-Ya, Masahiro Kanaguchi, Noriyuki Kawaguchi, Bong Gyu Kim, Hyo Ryoung Kim, Hyun Goo Kim, Jaeheon Kim, Jongsoo Kim, Kee Tae Kim, Mikyoung Kim, Hideyuki Kobayashi, Yusuke Kono, Tomoharu Kurayama, Changhoon Lee, Jung Won Lee, Sang Hyun Lee, Young Chol Minh, Naoko Matsumoto, Akiharu Nakagawa, Chung Sik Oh, Se Jin Oh, Sun Youp Park, Duk Gyoo Roh, Tetsuo Sasao, Katsunori M. Shibata, Min Gyu Song, Yoshiaki Tamura, Seog Oh Wi, Jae Hwan Yeom, Young Joo Yun

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Abstract

The Korean very-long-baseline interferometry (VLBI) network (KVN) and VLBI Exploration of Radio Astrometry (VERA) Array (KaVA) is the first international VLBI array dedicated to high-frequency (23-43GHz bands) observations in East Asia. Here, we report the first imaging observations of three bright active galactic nuclei (AGNs) known for their complex morphologies: 4C39.25, 3C273, and M87. This is one of the initial results of KaVA's early operation. Our KaVA images reveal extended outflows with complex substructures such as knots and limb brightening, in agreement with previous Very Long Baseline Array (VLBA) observations. Angular resolutions are better than 1.4 and 0.8 mas at 23 and 43GHz, respectively. KaVA achieves a high dynamic range of ∼1000, more than three times the value achieved by VERA. We conclude that KaVA is a powerful array with a great potential for the study of AGN outflows, at least comparable to the best existing radio interferometric arrays.

Original languageEnglish
Article number103
JournalPublications of the Astronomical Society of Japan
Volume66
Issue number6
DOIs
Publication statusPublished - 2013 Dec 18

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All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Niinuma, K., Lee, S. S., Kino, M., Sohn, B. W., Akiyama, K., Zhao, G. Y., Sawada-Satoh, S., Trippe, S., Hada, K., Jung, T., Hagiwara, Y., Dodson, R., Koyama, S., Honma, M., Nagai, H., Chung, A., Doi, A., Fujisawa, K., Han, M. H., ... Yun, Y. J. (2013). VLBI observations of bright AGN jets with the KVN and VERA Array (KaVA): Evaluation of imaging capability. Publications of the Astronomical Society of Japan, 66(6), [103]. https://doi.org/10.1093/pasj/psu104