Pilot KaVA monitoring on the M 87 jet: Confirming the inner jet structure and superluminal motions at sub-pc scales
文献类型：期刊论文
| 作者 | Hada, Kazuhiro3,12; Park, Jong Ho11; Kino, Motoki3,10; Niinuma, Kotaro9; Sohn, Bong Won8,10; Ro, Hyun Wook7; Jung, Taehyun10; Algaba, Juan-Carlos10; Zhao, Guang-Yao10; Lee, Sang-Sung8,10 |
| 刊名 | PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
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| 出版日期 | 2017-08-01 |
| 卷号 | 69期号:4 |
| 关键词 | Galaxies: Active Galaxies: Jets Radio Continuum: Galaxies Techniques: Interferometric |
| ISSN号 | 0004-6264 |
| DOI | 10.1093/pasj/psx054 |
| 英文摘要 | We report the initial results of our high-cadence monitoring program on the radio jet in the active galaxy M 87, obtained by the KVN and VERA Array (KaVA) at 22 GHz. This is a pilot study that preceded a larger KaVA-M 87 monitoring program, which is currently ongoing. The pilot monitoring was mostly performed every two to three weeks from 2013 December to 2014 June, at a recording rate of 1 Gbps, obtaining data for a total of ten epochs. We successfully obtained a sequence of good quality radio maps that revealed the rich structure of this jet from less than or similar to 1 mas to 20 mas, corresponding to physical scales (projected) of similar to 0.1-2 pc (or similar to 140-2800 Schwarzschild radii). We detected superluminal motions at these scales, together with a trend of gradual acceleration. The first evidence for such fast motions and acceleration near the jet base were obtained from recent VLBA studies at 43 GHz, and the fact that very similar kinematics are seen at a different frequency and time with a different instrument suggests that these properties are fundamental characteristics of this jet. This pilot program demonstrates that KaVA is a powerful VLBI array for studying the detailed structural evolution of the M 87 jet and also other relativistic jets. |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000410491300014 |
| 出版者 | OXFORD UNIV PRESS |
| 源URL | [http://119.78.226.72/handle/331011/32565]  |
| 专题 | 中国科学院上海天文台 |
| 通讯作者 | Hada, Kazuhiro |
| 作者单位 | 1.Max Planck Inst Radioastron, Hugel 69, D-53121 Bonn, Germany 2.Toyo Univ, Bunkyo Ku, 5-28-20 Hakusan, Tokyo 1128606, Japan 3.Natl Astron Observ Japan, Mizusawa VLBI Observ, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan 4.Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China 5.Kagoshima Univ, Grad Sch Sci & Engn, 1-21-35 Korimoto, Kagoshima, Kagoshima 8900065, Japan 6.MIT, Haystack Observ, 99 Millstone Rd, Westford, MA 01886 USA 7.Yonsei Univ, Dept Astron, 134 Shinchondong, Seoul 120749, South Korea 8.Univ Sci & Technol, Dept Astron & Space Sci, 217 Gajeong Ro, Daejeon, South Korea 9.Yamaguchi Univ, Grad Sch Sci & Technol Innovat, Yoshida 1677-1, Yamaguchi, Yamaguchi 7538512, Japan 10.Korea Astron & Space Sci Inst, Daejeon 34055, South Korea |
| 推荐引用方式 GB/T 7714 | Hada, Kazuhiro,Park, Jong Ho,Kino, Motoki,et al. Pilot KaVA monitoring on the M 87 jet: Confirming the inner jet structure and superluminal motions at sub-pc scales[J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,2017,69(4). |
| APA | Hada, Kazuhiro.,Park, Jong Ho.,Kino, Motoki.,Niinuma, Kotaro.,Sohn, Bong Won.,...&Shibata, Katsunori M..(2017).Pilot KaVA monitoring on the M 87 jet: Confirming the inner jet structure and superluminal motions at sub-pc scales.PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN,69(4). |
| MLA | Hada, Kazuhiro,et al."Pilot KaVA monitoring on the M 87 jet: Confirming the inner jet structure and superluminal motions at sub-pc scales".PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 69.4(2017). |
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来源：上海天文台
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