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arXiv 1406.4356astro-ph.IMastro-ph.HE
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用VLBI和VERA阵列（KaVA）观测明亮的AGN喷流：成像能力的评价

VLBI observations of bright AGN jets with 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, Yo… 展开作者

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 Kim, Jeewon 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

备注：
15 pages, 10 figures, 6 tables, accepted for publication in PASJ
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摘要：

韩国甚长基线干涉测量（VLBI）网络（KVN）和VLBI射电天体测量探测（VERA）阵列（KaVA）是东亚第一个专门用于高频（23和43 GHz波段）观测的国际VLBI阵列。在这里，我们报告的第一次成像观测的三个明亮的活动星系核（AGN），其复杂的形态：4C 39.25，3C 273，和M 87。这是KaVA早期科学的初步成果之一。我们的KaVA图像揭示了具有复杂子结构（如结和临边增亮）的扩展流出，与以前的甚长基线阵列（VLBA）观测一致。角分辨率在23 GHz和43 GHz时分别优于1.4和0.8毫角秒。KaVA实现了~1000的高动态范围，是VERA实现的值的三倍多。我们的结论是，KaVA是一个强大的阵列，具有很大的潜力的活动星系核外流的研究，至少可以媲美现有的最好的无线电干涉阵列。

英文摘要：

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 and 43 GHz bands) observations in East Asia. Here, we report the first imaging observations of three bright active galactic nuclei (AGNs) known for their complex morphologies: 4C 39.25, 3C 273, and M 87. This is one of the initial result of KaVA early science. Our KaVA images reveal extended outflows with complex substructure 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 milliarcsecond at 23 GHz and 43 GHz, 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.

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