Yoshiaki Hagiwara

Researcher Information

Research funding number

• 60399300

ORCID ID

•  https://orcid.org/0000-0002-9043-6048

J-Global ID

• 200901030373016793

Profile

• 2018- Toyo University, Faculty of Letters, Professor
  
  2015-2017 Toyo University, Faculty of Letters, Associate Professor
  
  2006-2015 National Astronomical Observatory of Japan, Assistant Professor
  
  2004-2006 National Astronomical Observatory of Japan, Research fellow
  
  2002-2004 ASTRON/Westerbork Observatory, Postdoctoral fellow
  
  1999-2002 Max-Planck-Institute for radio astronomy, Postdoctoral fellow

Research Interests

• Radio Astronomy, active galaxies, Active Galactic Nuclei, radio interferometry, VLBI   

Research Areas

• Natural sciences / Astronomy / Radio Astronomy
• Natural sciences / Astronomy

Academic & Professional Experience

• 2018/04 - Today  Toyo UniversityFaculty of Letters, Dept. of International Culture and Communication StudiesProfessor
• 2015/04 - 2018/03  Toyo UniversityFaculty of LettersAssociate Professor
• 2007/04 - 2015/03  National Astronomical Observatory of JapanMizusawa VLBI Observatory (Mitaka Office)Assistant Professor
• 2006/11 - 2007/03  National Astronomical Observatory of JapanSpace VLBI Project OfficeAssistant Professor
• 2004/10 - 2006/10  National Astronomical Observatory of JapanSpace VLBI Project OfficePostdoctoral fellow
• 2002/05 - 2004/09  ASTRON, Westerbork ObservatoryPostdoctoral fellow
• 1999/04 - 2002/04  Max-Planck Institute for radio astronomyVLBI groupPostdoctoral fellow

Education

• 1995/04 - 1999/03  Graduate University for Advanced Studies  数物科学研究科  Astronomical Science
• 1993/04 - 1995/03  Nagoya University  理学研究科  宇宙理学専攻
• 1989/04 - 1993/03  Kyushu University  Faculty of Sciences  Department of Physics

Association Memberships

• International Astronomical Union   Japan VLBI Consortium   European Astronomical Society   THE ASTRONOMICAL SOCIETY OF JAPAN   

Published Papers

• Precessing jet nozzle connecting to a spinning black hole in M87

  Yuzhu Cui; Kazuhiro Hada; Tomohisa Kawashima; Motoki Kino; Weikang Lin; Yosuke Mizuno; Hyunwook Ro; Mareki Honma; Kunwoo Yi; Jintao Yu; Jongho Park; Wu Jiang; Zhiqiang Shen; Evgeniya Kravchenko; Juan Carlos Algaba; Xiaopeng Cheng; Ilje Cho; Gabriele Giovannini; Marcello Giroletti; Taehyun Jung; Ru Sen Lu; Kotaro Niinuma; Junghwan Oh; Ken Ohsuga; Satoko Sawada-Satoh; Bong Won Sohn; Hiroyuki R. Takahashi; Mieko Takamura; Fumie Tazaki; Sascha Trippe; Kiyoaki Wajima; Kazunori Akiyama; Tao An; Keiichi Asada; Salvatore Buttaccio; Do Young Byun; Lang Cui; Yoshiaki Hagiwara; Tomoya Hirota; Jeffrey Hodgson; Noriyuki Kawaguchi; Jae Young Kim; Sang Sung Lee; Jee Won Lee; Jeong Ae Lee; Giuseppe Maccaferri; Andrea Melis; Alexey Melnikov; Carlo Migoni; Se Jin Oh; Koichiro Sugiyama; Xuezheng Wang; Yingkang Zhang; Zhong Chen; Ju Yeon Hwang; Dong Kyu Jung; Hyo Ryoung Kim; Jeong Sook Kim; Hideyuki Kobayashi; Bin Li; Guanghui Li; Xiaofei Li; Zhiyong Liu; Qinghui Liu; Xiang Liu; Chung Sik Oh; Tomoaki Oyama; Duk Gyoo Roh; Jinqing Wang; Na Wang; Shiqiang Wang; Bo Xia; Hao Yan; Jae Hwan Yeom; Yoshinori Yonekura; Jianping Yuan; Hua Zhang; Rongbing Zhao; Weiye Zhong

  Nature Springer Science and Business Media LLC 621 (7980) 711 - 715 0028-0836 2023/09 [Refereed]
  
• Ultra-wide band polarimetry using VLBI Exploration of Radio Astrometry (VERA)

  Yoshikai Hagiwara; Kazuhiro Hada; Mieko Takamura; Tomoaki Oyama; Syunsaku Suzuki

  Proceedings of Science 428 2023/08 [Refereed]
  
• Probing the Heart of Active Narrow-line Seyfert 1 Galaxies with VERA Wideband Polarimetry

  Mieko Takamura; Kazuhiro Hada; Mareki Honma; Tomoaki Oyama; Aya Yamauchi; Syunsaku Suzuki; Yoshiaki Hagiwara; Monica Orienti; Filippo D’Ammando; Jongho Park; Minchul Kam; Akihiro Doi

  The Astrophysical Journal 2023/07 [Refereed]
  
• Spectral analysis of a parsec-scale jet in M 87: Observational constraint on the magnetic field strengths in the jet

  Hyunwook Ro; Motoki Kino; Bong Won Sohn; Kazuhiro Hada; Jongho Park; Masanori Nakamura; Yuzhu Cui; Kunwoo Yi; Aeree Chung; Jeffrey Hodgson; Tomohisa Kawashima; Tao An; Sascha Trippe; Juan-Carlos Algaba; Jae-Young Kim; Satoko Sawada-Satoh; Kiyoaki Wajima; Zhiqiang Shen; Xiaopeng Cheng; Ilje Cho; Wu Jiang; Taehyun Jung; Jee-Won Lee; Kotaro Niinuma; Junghwan Oh; Fumie Tazaki; Guang-Yao Zhao; Kazunori Akiyama; Mareki Honma; Jeong Ae Lee; Rusen Lu; Yingkang Zhang; Keiichi Asada; Lang Cui; Yoshiaki Hagiwara; Tomoya Hirota; Noriyuki Kawaguchi; Shoko Koyama; Sang-Sung Lee; Se-Jin Oh; Koichiro Sugiyama; Mieko Takamura; Xuezheng Wang; Ju-Yeon Hwang; Dong-Kyu Jung; Hyo-Ryoung Kim; Jeong-Sook Kim; Hideyuki Kobayashi; Chung-Sik Oh; Tomoaki Oyama; Duk-Gyoo Roh; Jae-Hwan Yeom

  Astronomy & Astrophysics EDP Sciences 673 A159 - A159 0004-6361 2023/05 [Refereed]
  
• The Past and Future of East Asia to Italy: Nearly Global VLBI

  Gabriele Giovannini; Yuzhu Cui; Kazuhiro Hada; Kunwoo Yi; Hyunwook Ro; Bong Won Sohn; Mieko Takamura; Salvatore Buttaccio; Filippo D’Ammando; Marcello Giroletti; Yoshiaki Hagiwara; Motoki Kino; Evgeniya Kravchenko; Giuseppe Maccaferri; Alexey Melnikov; Kotaro Niinuma; Monica Orienti; Kiyoaki Wajima; Kazunori Akiyama; Akihiro Doi; Do-Young Byun; Tomoya Hirota; Mareki Honma; Taehyun Jung; Hideyuki Kobayashi; Shoko Koyama; Andrea Melis; Carlo Migoni; Yasuhiro Murata; Hiroshi Nagai; Satoko Sawada-Satoh; Matteo Stagni

  Galaxies MDPI AG 11 (2) 49 - 49 2023/03 [Refereed]
  
• Demonstration of Ultrawideband Polarimetry Using VLBI Exploration of Radio Astrometry (VERA)

  Yoshiaki Hagiwara; Kazuhiro Hada; Mieko Takamura; Tomoaki Oyama; Aya Yamauchi; Syunsaku Suzuki

  Galaxies MDPI AG 10 (6) 114 - 114 2022/12 [Refereed][Invited]
  
• Overview of the Observing System and Initial Scientific Accomplishments of the East Asian VLBI Network (EAVN)

  Kazunori Akiyama; Juan-Carlos Algaba; Tao An; Keiichi Asada; Kitiyanee Asanok; Do-Young Byun; Thanapol Chanapote; Wen Chen; Zhong Chen; Xiaopeng Cheng; James O. Chibueze; Ilje Cho; Se-Hyung Cho; Hyun-Soo Chung; Lang Cui; Yuzhu Cui; Akihiro Doi; Jian Dong; Kenta Fujisawa; Wei Gou; Wen Guo; Kazuhiro Hada; Yoshiaki Hagiwara; Tomoya Hirota; Jeffrey A. Hodgson; Mareki Honma; Hiroshi Imai; Phrudth Jaroenjittichai; Wu Jiang; Yongbin Jiang; Yongchen Jiang; Takaaki Jike; Dong-Kyu Jung; Taehyun Jung; Noriyuki Kawaguchi; Dong-Jin Kim; Hyo-Ryoung Kim; Jaeheon Kim; Jeong-Sook Kim; Kee-Tae Kim; Soon-Wook Kim; Motoki Kino; Hideyuki Kobayashi; Shoko Koyama; Busaba H. Kramer; Jee-Won Lee; Jeong Ae Lee; Sang-Sung Lee; Sang Won Lee; Bin Li; Guanghui Li; Xiaofei Li; Zhixuan Li; Qinghui Liu; Xiang Liu; Ru-Sen Lu; Kazuhito Motogi; Masanori Nakamura; Kotaro Niinuma; Chungsik Oh; Hongjong Oh; Junghwan Oh; Se-Jin Oh; Tomoaki Oyama; Jongho Park; Saran Poshyachinda; Hyunwook Ro; Duk-Gyoo Roh; Wiphu Rujopakarn; Nobuyuki Sakai; Satoko Sawada-Satoh; Zhi-Qiang Shen; Katsunori M. Shibata; Bong Won Sohn; Boonrucksar Soonthornthum; Koichiro Sugiyama; Yunxia Sun; Mieko Takamura; Yoshihiro Tanabe; Fumie Tazaki; Sascha Trippe; Kiyoaki Wajima; Jinqing Wang; Na Wang; Shiqiang Wang; Xuezheng Wang; Bo Xia; Shuangjing Xu; Hao Yan; Wenjun Yang; Jae-Hwan Yeom; Kunwoo Yi; Sang-Oh Yi; Yoshinori Yonekura; Hasu Yoon; Linfeng Yu; Jianping Yuan; Youngjoo Yun; Bo Zhang; Hua Zhang; Yingkang Zhang; Guang-Yao Zhao; Rongbing Zhao; Weiye Zhong

  Galaxies MDPI AG 10 (6) 113 - 113 2022/12
• The Intrinsic Structure of Sagittarius A* at 1.3 cm and 7 mm

  Ilje Cho; Guang-Yao Zhao; Tomohisa Kawashima; Motoki Kino; Kazunori Akiyama; Michael D. Johnson; Sara Issaoun; Kotaro Moriyama; Xiaopeng Cheng; Juan-Carlos Algaba; Taehyun Jung; Bong Won Sohn; Thomas P. Krichbaum; Maciek Wielgus; Kazuhiro Hada; Ru-Sen Lu; Yuzhu Cui; Satoko Sawada-Satoh; Zhiqiang Shen; Jongho Park; Wu Jiang; Hyunwook Ro; Kunwoo Yi; Kiyoaki Wajima; Jee Won Lee; Jeffrey Hodgson; Fumie Tazaki; Mareki Honma; Kotaro Niinuma; Sascha Trippe; Tao An; Yingkang Zhang; Jeong Ae Lee; Se-Jin Oh; Do-Young Byun; Sang-Sung Lee; Jae-Young Kim; Junghwan Oh; Shoko Koyama; Keiichi Asada; Xuezheng Wang; Lang Cui; Yoshiaki Hagiwara; Masanori Nakamura; Mieko Takamura; Tomoya Hirota; Koichiro Sugiyama; Noriyuki Kawaguchi; Hideyuki Kobayashi; Tomoaki Oyama; Yoshinori Yonekura; Jongsoo Kim; Ju-Yeon Hwang; Dong-Kyu Jung; Hyo-Ryoung Kim; Jeong-Sook Kim; Chung-Sik Oh; Duk-Gyoo Roh; Jae-Hwan Yeom; Bo Xia; Weiye Zhong; Bin Li; Rongbing Zhao; Jinqing Wang; Qinghui Liu; Zhong Chen

  The Astrophysical Journal American Astronomical Society 926 (2) 108 - 108 0004-637X 2022/02 [Refereed]
  
• Second-epoch ALMA Observations of 321 GHz Water Maser Emission in NGC 4945 and the Circinus Galaxy

  Yoshiaki Hagiwara; Shinji Horiuchi; Masatoshi Imanishi; Philip G. Edwards

  Astrophysical Journal 923 (2) 0004-637X 2021/12 [Refereed]
  
• 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

  Research in Astronomy and Astrophysics 21 (8) 1674-4527 2021/08
• Radio properties of 10 nearby ultraluminous infrared galaxies with signatures of luminous buried active galactic nuclei

  Takayuki J. Hayashi; Yoshiaki Hagiwara; Masatoshi Imanishi

  Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 504 (2) 2675 - 2686 0035-8711 2021/06 [Refereed]
  
• ALMA detection of millimetre 183 GHz H2O maser emission in the Superantennae galaxy at z ∼0.06

  Masatoshi Imanishi; Yoshiaki Hagiwara; Shinji Horiuchi; Takuma Izumi; Kouichiro Nakanishi

  Monthly Notices of the Royal Astronomical Society: Letters Oxford University Press (OUP) 502 (1) L79 - L84 1745-3925 2021/03 [Refereed]
  
• ALMA 0 02 resolution observations reveal HCN-abundance-enhanced counter-rotating and outflowing dense molecular gas at the NGC 1068 nucleus

  Masatoshi Imanishi; Dieu D. Nguyen; Keiichi Wada; Yoshiaki Hagiwara; Satoru Iguchi; Takuma Izumi; Nozomu Kawakatu; Kouichiro Nakanishi; Kyoko Onishi

  Astrophysical Journal 902 (2) 0004-637X 2020/10
• ALMA 0 02 resolution observations reveal HCN-abundance-enhanced counter-rotating and outflowing dense molecular gas at the NGC 1068 nucleus

  Masatoshi Imanishi; Dieu D. Nguyen; Keiichi Wada; Yoshiaki Hagiwara; Satoru Iguchi; Takuma Izumi; Nozomu Kawakatu; Kouichiro Nakanishi; Kyoko Onishi

  Astrophysical Journal 902 (2) 0004-637X 2020/10
• The First VERA Astrometry Catalog

  Tomoya Hirota; Takumi Nagayama; Mareki Honma; Yuuki Adachi; Ross A Burns; James O Chibueze; Yoon Kyung Choi; Kazuya Hachisuka; Kazuhiro Hada; Yoshiaki Hagiwara; Shota Hamada; Toshihiro Handa; Mao Hashimoto; Ken Hirano; Yushi Hirata; Takanori Ichikawa; Hiroshi Imai; Daichi Inenaga; Toshio Ishikawa; Takaaki Jike; Osamu Kameya; Daichi Kaseda; Jeong Sook Kim; Jungha Kim; Mi Kyoung Kim; Hideyuki Kobayashi; Yusuke Kono; Tomoharu Kurayama; Masako Matsuno; Atsushi Morita; Kazuhito Motogi; Takeru Murase; Akiharu Nakagawa; Hiroyuki Nakanishi; Kotaro Niinuma; Junya Nishi; Chung Sik Oh; Toshihiro Omodaka; Miyako Oyadomari; Tomoaki Oyama; Daisuke Sakai; Nobuyuki Sakai; Satoko Sawada-Satoh; Katsunori M Shibata; Makoto Shizugami; Jumpei Sudo; Koichiro Sugiyama; Kazuyoshi Sunada; Syunsaku Suzuki; Ken Takahashi; Yoshiaki Tamura; Fumie Tazaki; Yuji Ueno; Yuri Uno; Riku Urago; Koji Wada; Yuan Wei Wu; Kazuyoshi Yamashita; Yuto Yamashita; Aya Yamauchi; Akito Yuda

  Publications of the Astronomical Society of Japan Oxford University Press (OUP) 72 (4) 0004-6264 2020/08
• Kinematics of the M87 jet in the collimation zone: gradual acceleration and velocity stratification

  Park, Jongho; Hada, Kazuhiro; Kino, Motoki; Nakamura, Masanori; Hodgson, Jeffrey; Ro, Hyunwook; Cui, Yuzhu; Asada, Keiichi; Algaba, Juan-Carlos; Sawada-Satoh, Satoko; Lee, Sang-Sung; Cho, Ilje; Shen, Zhiqiang; Jiang, Wu; Trippe, Sascha; Niinuma, Kotaro; Sohn, Bong Won; Jung, Taehyun; Zhao, Guang-Yao; Wajima; Kiyoaki Tazaki, Fumie; Honma, Mareki; An, Tao; Akiyama, Kazunori; Byun, Do-Young; Kim, Jongsoo; Zhang, Yingkang; Cheng, Xiaopeng; Kobayashi, Hideyuki; Shibata; Katsunori M; Lee, Jee Won; Roh, Duk-Gyoo; Oh, Se-Jin; Yeom, Jae-Hwan; Jung, Dong-Kyu; Oh, Chungsik; Kim, Hyo-Ryoung; Hwang, Ju-Yeon; Hagiwara, Yoshiaki

  The Astrophysical Journal in press 2019/11 [Refereed]
  
• Jet kinematics of the quasar 4C+21.35 from observations with the KaVA very long baseline interferometry array

  Lee, Taeseok; Trippe, Sascha; Kino, Motoki; Sohn, Bong Won; Park, Jongho; Oh, Junghwan; Hada, Kazuhiro; Niinuma, Kotaro; Ro, Hyunwook; Jung, Taehyun; Zhao, Guang-Yao; Lee, Sang-Sung; Algaba, Juan-Carlos; Akiyama, Kazunori; Wajima, Kiyoaki; Sawada-Satoh, Satoko; Tazaki, Fumie; Cho, Ilje; Hodgson, Jeffrey; Lee, Jeong Ae; Hagiwara, Yoshiaki; Honma, Mareki; Koyama, Shoko; An, Tao; Cui, Yuzhu; Yoo, Hyemin; Kawaguchi, Noriyuki; Roh, Duk-Gyoo; Oh, Se-Jin; Yeom, Jae-Hwan; Jung, Dong-Kyu; Oh, Chungsik; Kim, Hyo-Ryoung; Hwang, Ju-Yeon; Byun, Do-Young; Cho, Se-Hyung; Kim, Hyun-Goo; Kobayashi, Hideyuki; Shibata; Katsunori M; Shen, Zhiqiang; Jiang, Wu; Lee, Jee Won

  Monthly Notices of the Royal Astronomical Society OXFORD UNIV PRESS 486 (2) 2412 - 2421 0035-8711 2019/06 [Refereed]
  
• Spatially-resolved Dense Molecular Gas Excitation in the Nearby LIRG VV 114

  Toshiki Saito; Daisuke Iono; Daniel Espada; Kouichiro Nakanishi; Junko Ueda; Hajime Sugai; Min S. Yun; Shuro Takano; Masatoshi Imanishi; Tomonari Michiyama; Satoshi Ohashi; Minju Lee; Yoshiaki Hagiwara; Kentaro Motohara; Takuji Yamashita; Misaki Ando; Ryohei Kawabe

  ASTROPHYSICAL JOURNAL 863 (2) 0004-637X 2018/07 [Refereed]
  
• Searches for H2O masers toward narrow-line Seyfert 1 galaxies

  Yoshiaki Hagiwara; Akihiro Doi; Kazuya Hachisuka; Shinji Horiuchi

  Publications of the Astronomical Society of Japan 70 (3) 0004-6264 2018/06 [Refereed]
  
• Pilot KaVA monitoring on the M87 jet: confirming the inner jet structure and superluminal motions at sub-pc scales

  Kazuhiro Hada; Jong Ho Park; Motoki Kino; Kotaro Niinuma; Bong Won Sohn; Hyun Wook Ro; Taehyun Jung; Juan-Carlos Algaba; Guang-Yao Zhao; Sang-Sung Lee; Kazunori Akiyama; Sascha Trippe; Kiyoaki Wajima; Satoko Sawada-Satoh; Fumie Tazaki; Ilje Cho; Jeffrey Hodgson; Jeong Ae Lee; Yoshiaki Hagiwara; Mareki Honma; Shoko Koyama; Junghwan Oh; Taeseak Lee; Hyemin Yoo; Noriyuki Kawaguchi; Duk-Gyoo Roh; Se-Jin Oh; Jae-Hwan Yeom; Dong-Kyu Jung; Chungsik Oh; Hyo-Ryoung Kim; Ju-Yeon Hwang; Do-Young Byun; Se-Hyung Cho; Hyun-Goo Kim; Hideyuki Kobayashi; Katsunori M. Shibata

  Publications of the Astronomical Society of Japan, 2017 OXFORD UNIV PRESS 69 (4) 71  0004-6264 2017/08 [Refereed]
  
• MERGER-INDUCED SHOCKS IN THE NEARBY LIRG VV 114 THROUGH METHANOL OBSERVATIONS WITH ALMA

  Toshiki Saito; Daisuke Iono; Daniel Espada; Kouichiro Nakanishi; Junko Ueda; Hajime Sugai; Shuro Takano; Min S. Yun; Masatoshi Imanishi; Satoshi Ohashi; Minju Lee; Yoshiaki Hagiwara; Kentaro Motohara; Ryohei Kawabe

  ASTROPHYSICAL JOURNAL IOP PUBLISHING LTD 834 (1) 0004-637X 2017/01 [Refereed]
  
• A SEARCH FOR SUBMILLIMETER H2O MASERS IN ACTIVE GALAXIES:. THE DETECTION OF 321 GHz H2O MASER EMISSION IN NGC 4945

  Yoshiaki Hagiwara; Shinji Horiuchi; Akihiro Doi; Makoto Miyoshi; Philip G. Edwards

  ASTROPHYSICAL JOURNAL IOP PUBLISHING LTD 827 (1) 0004-637X 2016/08 [Refereed]
  
• SiO MASERS AROUND WX PSC MAPPED WITH THE KVN AND VERA ARRAY (KaVA)

  Youngjoo Yun; Se-Hyung Cho; Hiroshi Imai; Jaeheon Kim; Yoshiharu Asaki; James O. Chibueze; Yoon Kyung Choi; Richard Dodson; Dong-Jin Kim; Kozue Kusuno; Naoko Matsumoto; Cheulhong Min; Miyako Oyadomari; Maria J. Rioja; Dong-Hwan Yoon; Do-Young Byun; Hyunsoo Chung; Moon-Hee Chung; Yoshiaki Hagiwara; Myoung-Hee Han; Seog-Tae Han; Tomoya Hirota; Mareki Honma; Jung-Wook Hwang; Do-Heung Je; Takaaki Jike; Dong-Kyu Jung; Taehyun 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; Jongsoo Kim; Kee-Tae Kim; Mikyoung Kim; Hideyuki Kobayashi; Yusuke Kono; Tomoharu Kurayama; Changhoon Lee; Jeewon Lee; Jeong Ae Lee; Jung-Won Lee; Sang Hyun Lee; Sang-Sung Lee; A-Ran Lyo; Young Chol Minh; Chungsik Oh; Se-Jin Oh; Tomoaki Oyama; Duk-Gyoo Roh; Satoko Sawada-Satoh; Katsunori M. Shibata; Bong Won Sohn; Min-Gyu Song; Yoshiaki Tamura; Seog-Oh Wi; Jae-Hwan Yeom

  ASTROPHYSICAL JOURNAL IOP PUBLISHING LTD 822 (1) 0004-637X 2016/05 [Refereed]
  
• HIGH-SENSITIVITY 86 GHz (3.5mm) VLBI OBSERVATIONS OF M87: DEEP IMAGING OF THE JET BASE AT A RESOLUTION OF 10 SCHWARZSCHILD RADII

  Kazuhiro Hada; Motoki Kino; Akihiro Doi; Hiroshi Nagai; Mareki Honma; Kazunori Akiyama; Fumie Tazaki; Rocco Lico; Marcello Giroletti; Gabriele Giovannini; Monica Orienti; Yoshiaki Hagiwara

  ASTROPHYSICAL JOURNAL IOP PUBLISHING LTD 817 (2) 0004-637X 2016/02 [Refereed]
  
• HIGH-RESOLUTION IMAGING OF WATER MASER EMISSION IN THE ACTIVE GALAXIES NGC 6240 AND M51

  Yoshiaki Hagiwara; Philip G. Edwards

  ASTROPHYSICAL JOURNAL IOP PUBLISHING LTD 815 (2) 124  0004-637X 2015/12 [Refereed]
  
• A FANAROFF-RILEY TYPE I CANDIDATE IN NARROW-LINE SEYFERT 1 GALAXY Mrk 1239

  Akihiro Doi; Kiyoaki Wajima; Yoshiaki Hagiwara; Makoto Inoue

  ASTROPHYSICAL JOURNAL LETTERS IOP PUBLISHING LTD 798 (2) 2041-8205 2015/01 [Refereed]
  
• 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 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

  PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN OXFORD UNIV PRESS 66 (6) 0004-6264 2014/12 [Refereed]
  
• The innermost collimation structure of the M87 jet down to ∼10 schwarzschild radii

  Kazuhiro Hada; Motoki Kino; Akihiro Doi; Hiroshi Nagai; Mareki Honma; Yoshiaki Hagiwara; Marcello Giroletti; Gabriele Giovannini; Noriyuki Kawaguchi

  Astrophysical Journal Institute of Physics Publishing 775 (1) 1538-4357 2013/09 [Refereed]
  
• Active Galactic Nucleus and Extended Starbursts in a Midstage Merger VV 114

  Iono, Daisuke; Saito, Toshiki; Yun, Min S.; Kawabe, Ryohei; Espada, Daniel; Hagiwara, Yoshiaki; Imanishi, Masatoshi; Izumi, Takuma; Kohno, Kotaro; Motohara, Kentaro; Nakanishi, Kouichiro; Sugai, Hajime; Tateuchi, Ken; Tamura, Yoichi; Ueda, Junko; Yoshii, Yuzuru

  Publications of the Astronomical Society of Japan 65 (3) 0004-6264 2013/06 [Refereed]
  
• SUBMILLIMETER H2O MASER IN CIRCINUS GALAXY-A NEW PROBE FOR THE CIRCUMNUCLEAR REGION OF ACTIVE GALACTIC NUCLEI

  Yoshiaki Hagiwara; Makoto Miyoshi; Akihiro Doi; Shinji Horiuchi

  ASTROPHYSICAL JOURNAL LETTERS IOP PUBLISHING LTD 768 (2) 2041-8205 2013/05 [Refereed]
  
• ATCA survey of H2O masers in the large magellanic cloud

  H. Imai; Y. Katayama; S. P. Ellingsen; Y. Hagiwara

  Monthly Notices of the Royal Astronomical Society: Letters 432 (1) L16 - L20 1745-3925 2013 [Refereed]
  
• VLBI OBSERVATIONS OF THE JET IN M 87 DURING THE VERY HIGH ENERGY gamma-RAY FLARE IN 2010 APRIL

  Kazuhiro Hada; Motoki Kino; Hiroshi Nagai; Akihiro Doi; Yoshiaki Hagiwara; Mareki Honma; Marcello Giroletti; Gabriele Giovannini; Noriyuki Kawaguchi

  ASTROPHYSICAL JOURNAL IOP PUBLISHING LTD 760 (1) 0004-637X 2012/11 [Refereed]
  
• An origin of the radio jet in M87 at the location of the central black hole

  Kazuhiro Hada; Akihiro Doi; Motoki Kino; Hiroshi Nagai; Yoshiaki Hagiwara; Noriyuki Kawaguchi

  NATURE NATURE PUBLISHING GROUP 477 (7363) 185 - 187 0028-0836 2011/09 [Refereed]
  
• VERY LONG BASELINE INTERFEROMETRY OBSERVATIONS OF NGC 6240: RESOLVING THE DOUBLE NUCLEI AND RADIO SUPERNOVAE

  Yoshiaki Hagiwara; Willem A. Baan; Hans-Rainer Kloeckner

  ASTRONOMICAL JOURNAL IOP PUBLISHING LTD 142 (1) 0004-6256 2011/07 [Refereed]
  
• TWO EPOCHS OF VERY LARGE ARRAY OBSERVATIONS OF WATER MASER EMISSION IN THE ACTIVE GALAXY NGC 6240

  Yoshiaki Hagiwara

  ASTRONOMICAL JOURNAL IOP PUBLISHING LTD 140 (6) 1905 - 1910 0004-6256 2010/12 [Refereed]
  
• The distance to a star-forming region in the outer arm of the galaxy

  K. Hachisuka; A. Brunthaler; K. M. Menten; M. J. Reid; Y. Hagiwara; N. Mochizuki

  Astrophysical Journal Institute of Physics Publishing 696 (2) 1981 - 1986 1538-4357 2009/05 [Refereed]
  
• H I and OH absorption toward NGC 6240

  Willem A. Baan; Yoshiaki Hagiwara; Peter Hofner

  Astrophysical Journal Institute of Physics Publishing 661 (1 I) 173 - 184 1538-4357 2007/05 [Refereed]
  
• Low-luminosity extragalactic water masers toward M82, M51, and NGC 4051

  Yoshiaki Hagiwara

  Astronomical Journal 133 (3) 1176 - 1186 0004-6256 2007/03 [Refereed]
  
• HI and OH absorption toward NGC 6240

  Yoshiaki Hagiwara; Willem A. Baan; Peter Hofner

  NEW ASTRONOMY REVIEWS ELSEVIER SCI LTD 51 (1-2) 58 - 62 1387-6473 2007/02 [Refereed]
  
• A search for extragalactic H2O maser emission towards IRAS galaxies - II. Discovery of an H2O maser in the type 1 Seyfert galaxy NGC 4051

  Yoshiaki Hagiwara; Philip J. Diamond; Makoto Miyoshi; Emmanouel Rovilos; Willem Baan

  Monthly Notices of the Royal Astronomical Society 344 (4) L53 - L57 0035-8711 2003/10 [Refereed]
  
• Location of H2O maser in the double-nuclei system of NGC 6240

  Y Hagiwara; PJ Diamond; M Miyoshi

  ASTRONOMY & ASTROPHYSICS E D P SCIENCES 400 (2) 457 - 463 0004-6361 2003/03 [Refereed]
  
• A search for extragalactic H2O maser emission towards IRAS galaxies - Detection of a maser from an infrared-luminous merger, NGC 6240

  Y Hagiwara; PJ Diamond; M Miyoshi

  ASTRONOMY & ASTROPHYSICS E D P SCIENCES 383 (1) 65 - 70 0004-6361 2002/02 [Refereed]
  
• VLBI study of water maser emission in the Seyfert 2 galaxy NGC 5793. I. Imaging blueshifted emission and the parsec-scale jet

  Yoshiaki Hagiwara; Philip J. Diamond; Naomasa Nakai; Ryohei Kawabe

  Astrophysical Journal Institute of Physics Publishing 560 (1) 119 - 126 1538-4357 2001/10 [Refereed]
  
• Water maser emission from the active nucleus in M51

  Yoshiaki Hagiwara; Christian Henkel; Karl M. Menten; Naomasa Nakai

  Astrophysical Journal Institute of Physics Publishing 560 (1) L37 - L40 1538-4357 2001/10 [Refereed]
  
• Discovery of a very luminous megamaser during a radio flare in the Seyfert 2 galaxy Mrk 348

  Heino Falcke; Christian Henkel; Alison B. Peck; Yoshiaki Hagiwara; M. Almudena Prieto; Jack F. Gallimore

  2000/04 [Refereed]
  
• Detection of a water-vapor megamaser in the active galaxy NGC 5793

  Yoshiaki Hagiwara; Kotaro Kohno; Ryohei Kawabe; Naomasa Nakai

  Publications of the Astronomical Society of Japan Astronomical Society of Japan 49 (2) 171 - 177 0004-6264 1997 [Refereed]
  

MISC

• Search for H₂O Maser Emission towards active galaxies: III-Revisited to Circinus Galaxy

  HAGIWARA Yoshiaki  東洋大学紀要 自然科学篇(Web)  (67)  2023
• Search for H₂O Maser Emission towards active galaxies: II-New detections of 183 GHz H₂O Emission

  HAGIWARA Yoshiaki  東洋大学紀要 自然科学篇(Web)  (66)  2022
• ALMAによる超高光度赤外線銀河の水分子,及び,高密度分子ガスの観測

  今西昌俊; 中西康一郎; 泉拓磨; 馬場俊介; 萩原喜昭; 堀内真司  日本天文学会年会講演予稿集  2022-  2022
• Search for H₂O maser emission toward active galaxies-New detections of 183 GHz H₂O emission

  HAGIWARA Yoshiaki  東洋大学紀要 自然科学篇(Web)  (65)  2021
• Search for H₂O maser emission towards infrared luminous galaxies

  HAGIWARA Yoshiaki  東洋大学紀要 自然科学篇(Web)  (64)  2020
• East Asian VLBI Network-The Evolution and Future of EAVN

  HAGIWARA Yoshiaki  東洋大学紀要 自然科学篇(Web)  (63)  2019
• VERA43GHz帯用両偏波受信システムの開発と活動銀河核ジェットの生成・収束機構の研究

  萩原喜昭; 河野祐介; 鈴木駿策; 秦和弘; 小山友明; 宇賀裕哉; 松枝知佳; 藤澤健太; 新沼浩太郎; 嶺重慎; 米倉覚則; 笹田真人  日本天文学会年会講演予稿集  2018-  191  2018/08
• Space VLBI Astronomy: Current Status and Future Prospects

  HAGIWARA Yoshiaki  東洋大学紀要 自然科学篇(Web)  (62)  2018
• 多周波電波観測による超高光度赤外線銀河のエネルギー源診断

  林隆之; 林隆之; 今西昌俊; 萩原喜昭  日本天文学会年会講演予稿集  2017-  179  2017/08
• VERA‐upgrade計画の進捗 I

  小山友明; 河野祐介; 鈴木駿策; 松枝知佳; 宇賀裕哉; KIM Jeong‐Sook; 永山匠; 寺家孝明; 萩原喜昭  日本天文学会年会講演予稿集  2017-  206  2017/08
• White Paper on East Asian Vision for mm/submm VLBI: Toward Black Hole Astrophysics down to Angular Resolution of 1~R$_{S}$

  Asada, K; Kino, M; Honma, M; Hirota, T; Lu, R.-S; Inoue, M; Sohn, B.-W; Shen, Z.-Q; Ho, P. T. P; Akiyama, K; Algaba, J-C; An, T; Bower, G; Byun, D-Y; Dodson, R; Doi, A; Edwards, P. G; Fujisawa, K; Gu, M-F; Hada, K; Hagiwara, Y; Jaroenjittichai, P; Jung, T; Kawashima, T; Koyama, S; Lee, S-S; Matsushita, S; Nagai, H; Nakamura, M; Niinuma, K; Phillips, C; Park, J-H; Pu, H-Y; Ro, H-W; Stevens, J; Trippe, S; Wajima, K; Zhao, G-Y  eprint arXiv:1705.04776  2017/05
• Submillimeter Continuum Emission of Active Galactic Nuclei

  萩原 喜昭  東洋大学紀要. 自然科学篇 = Journal of Toyo University. 東洋大学自然科学研究室 編  (61)  79  -87  2017/03
• Submillimeter Continuum Emission of Active Galactic Nuclei

  HAGIWARA Yoshiaki  東洋大学紀要 自然科学篇  (61)  2017
• Millimeter VLBI observations of Sgr A* with KaVA and KVN

  Zhao, G.-Y; Kino, M; Cho, I.-J; Akiyama, K; Sohn, B. W; Jung, T; Algaba, J. C; Hada, K; Hagiwara, Y; Hodgson, J; Honma, M; Kawaguchi, N; Koyama, S; Lee, J. A; Lee, T; Niinuma, K; Oh, J; Park, J.-H; Ro, H; Sawada-Satoh, S; Tazaki, F; Trippe, S; Wajima, K; Yoo, H  The Multi-Messenger Astrophysics of the Galactic Centre, Proceedings of the International Astronomical Union, IAU Symposium  332-  (S322)  56  -63  2017/01  [Refereed]
  
• Water Vapour Maser Emission in the Type 2 Seyfert Galaxy NGC 1068

  HAGIWARA Yoshiaki  東洋大学紀要 自然科学篇  (60)  2016
• The East-Asian VLBI Network

  Kiyoaki Wajima; Yoshiaki Hagiwara; Tao An; Willem A. Baan; Kenta Fujisawa; Longfei Hao; Wu Jiang; Taehyun Jung; Noriyuki Kawaguchi; Jongsoo Kim; Hideyuki Kobayashi; Se-Jin Oh; Duk-Gyoo Roh; Min Wang; Yuanwei Wu; Bo Xia; Ming Zhang  FRONTIERS IN RADIO ASTRONOMY 2015  502-  81  -86  2016  [Refereed]
  
• Molecular Gas Excitation and Chemistry in VV 114 and NGC 1614 with ALMA

  Toshiki Saito; Daisuke Iono; Junko Ueda; Min S. Yun; Kouichiro Nakanishi; Hajime Sugai; Masatoshi Imanishi; Yoshiaki Hagiwara; Hiroyuki Kaneko; Kentaro Motohara; Daniel Espada; Takuji Yamashita; Minju Lee; Tomonari Michiyama; Ryohei Kawabe  FROM INTERSTELLAR CLOUDS TO STAR-FORMING GALAXIES: UNIVERSAL PROCESSES?  (315)  2016  [Refereed]
  
• 活動銀河におけるサブミリ波帯H₂Oメーザー探査 II

  萩原喜昭; 堀内真司; 土居明広; 三好真  日本天文学会年会講演予稿集  2015-  192  2015/08
• VLBA+GBT@86GHzによるM87ジェット生成領域の高分解能・高解像度

  秦和弘; 紀基樹; 永井洋; 本間希樹; 秋山和徳; 田崎文得; 萩原喜昭; 土居明広; GIOVANNINI G; GIROLETTI M  日本天文学会年会講演予稿集  2015-  199  2015/02
• Diffuse and Dense Gas in Nearby Luminous Merging Galaxies

  Toshiki Saito; Daisuke Iono; Junko Ueda; Min S. Yun; Kouichiro Nakanishi; Masatoshi Imanishi; Yoshiaki Hagiwara; Hiroyuki Kaneko; Sinya Komugi; Daniel Espada; Kentaro Motohara; Hajime Sugai; Takuji Yamashita; Ken Tateuchi; Minju Lee; Tomonari Michiyama; Ryohei Kawabe  REVOLUTION IN ASTRONOMY WITH ALMA: THE THIRD YEAR  499-  133  -136  2015  [Refereed]
  
• Extragalactic Sub-millimeter H2O Maser-Detection of a 321 GHz Water Maser in Circinus Galaxy

  Yoshiaki Hagiwara; Shinji Horiuchi; Akihiro Doi; Makoto Miyoshi  REVOLUTION IN ASTRONOMY WITH ALMA: THE THIRD YEAR  499-  131  -132  2015  [Refereed]
  
• 東アジアVLBI観測網構築に向けた試験観測の状況

  萩原喜昭; 小林秀行; 小山友明; 藤沢健太; 新沼浩太郎; 米倉覚則  日本天文学会年会講演予稿集  2014-  66  2014/08
• Investigating AGN/Starburst activities through ALMA multi-line observations in the mid-stage IR-bright merger VV 114

  Toshiki Saito; Daisuke Iono; Min S. Yun; Junko Ueda; Daniel Espada; Yoshiaki Hagiwara; Masatoshi Imanishi; Kentaro Motohara; Kouichiro Nakanishi; Hajime Sugai; Ken Tateuchi; Minju Lee; Ryohei Kawabe  Proceedings of the International Astronomical Union  10-  196  -199  2014  [Refereed]
  
• A Search for Extragalactic Submillimeter Water Maser-A New Probe for the Circumnuclear region of AGN?

  萩原喜昭; 三好真; 土居明広; 堀内真司  天文月報  106-  (10)  660  -665  2013/09
• 活動銀河におけるサブミリ波帯H₂Oメーザー探査

  萩原喜昭; 三好真; 土居明広; 堀内真司  日本天文学会年会講演予稿集  2013-  205  2013/02
• Very Long Baseline Array Imaging of Parsec-scale Radio Emissions in Nearby Radio-quiet Narrow-line Seyfert 1 Galaxies

  Akihiro Doi; Keiichi Asada; Kenta Fujisawa; Hiroshi Nagai; Yoshiaki Hagiwara; Kiyoaki Wajima; Makoto Inoue  Astrophysical Journal  765-  (1)  69  -69  2013/01
• ATCA survey of H2O masers in the Large Magellanic Cloud

  IMAI Hiroshi; KATAYAMA Yuta; ELLINGSEN S. P.; HAGIWARA Yoshiaki  Monthly Notices of the Royal Astronomical Society  432-  (1)  16  -20  2013
• ALMA Observations of the IR-Bright Merger VV114

  T. Saito; D. Iono; M. Yun; J. Ueda; D. Espada; Y. Hagiwara; M. Imanishi; K. Motohara; K. Nakanishi; H. Sugai; K. Tateuchi; R. Kawabe  NEW TRENDS IN RADIO ASTRONOMY IN THE ALMA ERA: THE 30TH ANNIVERSARY OF NOBEYAMA RADIO OBSERVATORY  476-  287  -290  2013  [Refereed]
  
• Search for Extragalactic H2O Maser Toward Active Galaxies

  Yoshiaki Hagiwara; Akihiro Doi; Kazuya Hachisuka  NEW TRENDS IN RADIO ASTRONOMY IN THE ALMA ERA: THE 30TH ANNIVERSARY OF NOBEYAMA RADIO OBSERVATORY  476-  295  -296  2013  [Refereed]
  
• 多周波VLBIによる電波銀河M87の中心エンジン近傍10‐100シュバルツシルト半径領域におけるジェット形状探査

  秦和弘; 紀基樹; 永井洋; 土居明広; 萩原喜昭; 本間希樹; 川口則幸  日本天文学会年会講演予稿集  2012-  206  2012/08
• VLAおよびEVNによる,活動銀河NGC6240中心領域の高空間分解能イメージング観測

  萩原喜昭  日本天文学会年会講演予稿集  2012-  230  2012/02
• キャラバン・サブ,ブラックホール解像装置

  三好真; 加藤成晃; 高遠徳尚; 岡田則夫; 三ツ井健司; 大淵喜之; 萩原喜昭; 宮地竹史; 川口則幸; 近藤哲朗; 関戸衛; 小山泰弘; 氏原秀樹; 入交芳久; イシツカ ホセ; ビダル エリック; 朝木義晴; 坪井昌人; 竹内央; 春日隆; 新沼浩太郎; 江里口良治; 吉田慎一郎; 谷口敬介; 冨松彰; 南部保貞; 高橋真聡; 斉田浩見; 小出眞路; 高橋労太; 岡朋治; 面高俊宏; 西尾正則; 今井裕; 亀野誠二; 高羽浩; 須藤広志; 若松謙一; 大師堂経明  日本天文学会年会講演予稿集  2012-  254  2012/02
• 電波銀河M87における超高エネルギーガンマ線フレア領域のVLBI観測

  秦和弘; 紀基樹; 永井洋; 土居明広; 萩原喜昭  日本天文学会年会講演予稿集  2011-  208  2011/08
• VLBIによる活動銀河NGC6240中心核領域の電波イメージング観測

  萩原喜昭; BAAN Willem A; KLOECKNER Hans‐Rainer; KLOECKNER Hans‐Rainer  日本天文学会年会講演予稿集  2011-  177  2011/02
• サブミリ波VLBIによる,強重力場での相対論検証計画

  三好真; 新沼浩太郎; 高遠徳尚; 岡田則夫; 三ツ井健司; 大淵喜之; 萩原喜昭; 川口則幸; 関戸衛; 小山泰弘; 氏原秀樹; 入交芳久; イシツカ ホセ; ビダル エリック; 朝木義晴; 加藤成晃; 坪井昌人; 竹内央; 春日隆; 冨松彰; 高橋真聡; 江里口良治; 吉田慎一郎; 谷口啓介; 小出眞路; 高橋労太; 岡朋治; 西尾正則; 須藤広志  日本天文学会年会講演予稿集  2011-  57  2011/02
• 次期ミリ波スペースVLBI計画:ASTRO‐G衛星開発の進捗

  坪井昌人; 斉藤宏文; 村田泰宏; 満田和久; 紀伊恒男; 吉原圭介; 土居明広; 望月奈々子; 亀谷和久; 吉川真; 竹内央; 朝木義晴; 小松敬治; 樋口健; 橋本樹明; 後藤健; 佐藤英一; 石村康正; 坂井真一郎; 岸本直子; 太刀川純孝; 小林秀行; 梅本智文; 萩原喜昭; 河野祐介; 永井洋; 紀基樹; 氏原秀樹; 小川英夫; 木村公洋; 春日隆; 亀野誠二; 藤沢健太; 浅田圭一; 井上允  日本天文学会年会講演予稿集  2010-  245  2010/02
• ASTRO‐G MMIC‐LNAチップの地上観測用としての性能評価

  亀谷和久; 坪井昌人; 萩原喜昭  日本天文学会年会講演予稿集  2010-  209  2010/02
• 次期ミリ波スペースVLBI計画:ASTRO‐G衛星開発の進捗

  坪井昌人; 斉藤宏文; 村田泰宏; 川原康介; 吉原圭介; 亀谷和久; 紀伊恒男; 土居明広; 望月奈々子; 吉川真; 竹内央; 朝木義晴; 小松敬治; 樋口健; 橋本樹明; 坂井真一郎; 岸本直子; 太刀川純孝; 小林秀行; 川口則行; 萩原喜昭; 河野祐介; 氏原秀樹; 永井洋; 梅本智文; 紀基樹; 平林久; 小川英夫; 木村公洋; 阿部安宏; 春日隆; 亀野誠二; 西尾正則; 但木兼一; 佐藤麻美子; 藤沢健太; 輪島清昭; 楠野こず枝; 浅田圭一; 井上允  日本天文学会年会講演予稿集  2009-  254  2009/08
• VSOP‐2Key Science Programの課題検討

  亀野誠二; 今井裕; 坪井昌人; 土居明広; 村田泰宏; 萩原喜昭; 紀基樹; 梅本智文; 永井洋; 浅田圭一  日本天文学会年会講演予稿集  2009-  256  2009/08
• VSOP‐2地上VLBI総合整備計画―2012年度後半打ち上げに向けて―

  萩原喜昭; 川口則幸; 河野祐介  日本天文学会年会講演予稿集  2009-  248  2009/02
• Square Kilometer Arrayと国内での活動

  中西裕之; 萩原喜昭; 大田泉; 徂徠和夫  日本天文学会年会講演予稿集  2009-  214  2009/02
• VSOP‐2 Key Science Programの方針

  亀野誠二; 坪井昌人; 村田泰宏; 平林久; 萩原喜昭; 井上允; 藤沢健太  日本天文学会年会講演予稿集  2009-  249  2009/02
• VSOP‐2 Key Science Programの検討状況報告

  萩原喜昭; 亀野誠二  日本天文学会年会講演予稿集  2008-  263  2008/02
• ASTRO‐G/VSOP‐2計画の各種検討の現状

  村田泰宏; 斉藤宏文; 坪井昌人; 太刀川純孝; 土居明広; 望月奈々子; 紀基樹; 吉川真; 竹内央; 朝木義晴; 小松敬治; 樋口健; 橋本樹明; 坂井真一郎; 岸本直子; 浅田圭一; 川原康介; 平林久; 井上允; 小林秀行; 川口則幸; 萩原喜昭; 河野祐介; 氏原秀樹; 永井洋; 梅本智文; 亀野誠二; 面高俊宏; 小川英夫; 木村公洋; 阿部安宏; 春日隆; 藤沢健太; 輪島清昭  日本天文学会年会講演予稿集  2008-  264  2008/02
• ミリ波スペースVLBI衛星VSOP2計画:ASTRO‐Gプロジェクトの開始

  坪井昌人; 斉藤宏文; 太刀川純孝; 村田泰宏; 土居明広; 望月奈々子; 紀基樹; 吉川真; 朝木義晴; 竹内央; 樋口健; 橋本樹明; 坂井真一郎; 岸本直子; 浅田圭一; 川原康介; 井上允; 小林秀行; 萩原喜昭; 河野祐介; 氏原秀樹; 永井洋; 梅本智文; 平林久; 小川英夫; 木村公洋; 阿部安宏; 春日隆; 亀野誠二; 西尾正則; 佐藤麻美子; 藤沢健太; 輪島清昭  日本天文学会年会講演予稿集  2007-  281  2007/08
• Extragalactic Masers

  萩原喜昭  天文月報  100-  (3)  116  -123  2007/02
• Extragalactic Masers

  HAGIWARA Yoshiaki  The Astronomical herald  100-  (3)  116  -123  2007/02
• VSOP‐2計画のスタートにむけて

  平林久; 斉藤宏文; 村田泰宏; 樋口健; 朝木義晴; 吉川真; 望月奈々子; 井上允; 梅本智文; 河野裕介; 萩原喜昭; 浅田圭一; 氏原秀樹; 坪井昌人; 小林秀行; 亀野誠二; 春日隆; 小川英夫; 藤沢健太  日本天文学会年会講演予稿集  2006-  240  2006/08
• Japanese VLBI Network(JVN)によるradio‐loud狭輝線セイファート1型銀河の撮像観測

  土居明広; 藤澤健太; 原田慶一朗; 萩原喜昭; 井上允; 浅田圭一; 永井洋; 輪島清昭  日本天文学会年会講演予稿集  2006-  179  2006/08
• Water maser motions in W3(OH) and a determination of its distance

  K. Hachisuka; A. Brunthaler; K. M. Menten; M. J. Reid; H. Imai; Y. Hagiwara; M. Miyoshi; S. Horiuchi; T. Sasao  ASTROPHYSICAL JOURNAL  645-  (1)  337  -344  2006/07
• VSOP-2の軌道決定についての検討

  吉川真; 中村信一; 工藤伸夫; 加藤隆二; 市川勉; 竹内央; 平林久; 村田泰宏; 朝木義晴; 望月奈々子; 大坪俊通; 久保岡俊宏; 新谷昌人; 河野裕介; 萩原喜昭; 山本洋介  日本天文学会年会講演予稿集  2006-  2006
• W3(OH)における水蒸気メーザーの運動と距離決定

  蜂須賀一也; アンドレアス・ブランターラー; カール・メンテン、マーク・リード; 今井 裕; 萩原喜昭; 三好真; 堀内真二; 笹尾哲夫  天体物理学学会誌  645-  337  -344  2006
• 新Rainbow干渉計システム立ち上げ試験観測―45m搭載用受信機フロントエンドの開発

  萩原喜昭; 河野孝太郎; 浮田信治; 川辺良平; 奥村幸子; 砂田和良  日本天文学会年会講演予稿集  1997-  158  1997
• Development of frontend in the RAINBOW plan.

  萩原喜昭; 砂田和良; 山口千栄子; 川辺良平  日本天文学会年会講演予稿集  1996-  194  1996
• Motion of molecular gas in central core of infrared ray galaxy NGC6240.

  中川貴雄; 奥村幸子; 川辺良平; 紀伊恒男; 藤本龍一; 小賀坂康志; 石井景子; 萩原喜昭  日本天文学会年会講演予稿集  1996-  1996
• 活動銀河核 VLBIによる重力レンズ天体PKS1830‐211の観測的研究

  萩原喜昭; 藤沢健太; 村田泰宏; 平林久; 笹尾哲夫; 亀谷収; 朝木義晴; 岩田隆浩; 関戸衛  日本天文学会年会講演予稿集  1995-  128  1995
• Monitor observation of gravitational lens celestial body PKS1830-211 by Usuda - Kashima - Mizusawa (UKM) 3 base line VLBI. ( the Ministry of Education S ).

  萩原喜昭  1994年度VLBIシンポジウム  204  -206  1994

Research Grants & Projects

• Probing magnetic fields of supermassive black-hole jets with next-generation international VLBI networks

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research

  Date (from‐to) : 2019/04 -2022/03 

  Author : Hada Kazuhiro

   

  Elucidation of the generation mechanism of powerful jets ejected from supermassive black holes is one of the most important questions in astronomy. In this research, we focused on the polarization emitted from the gas around the black hole and investigated the magnetic field structure to address the above mystery. To this end, we implemented dual-polarization receiving system for the Japanese radio telescope network VERA, and together with other radio telescopes in East Asia, we observed polarized emission from nearby supermassive black holes and jets using the East Asian VLBI Network. We obtained a clue for the presence of strong magnetic fields for some targets. The results suggest that magnetic fields play a key role in jet generation mechanisms from supermassive black holes.
• Approaching the creation mechanism of black hole jet using mm-VLBI polarimetry

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research

  Date (from‐to) : 2015 -2018 

  Author : Hagiwara Yoshiaki; OYAMA TOMOAKI; HADA KAZUHIRO; HONMA MAREKI; YONEKURA YOSHINORI; MINESHIGE SHIN; NIINUMA KOTARO; SUZUKI SYUNSAKU; SASADA MAHITO

   

  In order to reveal the creation, acceleration, and collimation mechanism of jets ejected from the vicinity of super massive black hole at the center of active galactic nuclei, it is important to execute direct imaging of magnetic field structure around the base of the jets at millimeter wavelengths, where the jets are optically thinner. To achieve this, it is necessary to monitor the jet base using very long baseline radio interferometer (VLBI) with the highest spatial resolution. In this program, the receivers of the two radio telescopes of the NAOJ VERA were developed to enable simultaneous dual polarization reception at 43 GHz (7 mm). Furthermore, by combining the two VERA telescopes and three telescopes in Korea, we have organized a VLBI network capable of polarization observation based on international collaboration. This is a definite step forward in VLBI monitoring of jets from super massive black hole.
• Precise measurements of black holes for studies of active galactic nuclei

  Japan Society for the Promotion of Science：Grants-in-Aid for Scientific Research

  Date (from‐to) : 2012 -2016 

  Author : DOI AKIHIRO; HAGIWARA Yoshiaki

   

  We tried to solve the "three fundamental problems" of black holes on active galactic nuclei (AGNs) through the "multi-frequency phase-referencing VLBI" method that implements position determination with accuracy comparable to the Schwarzschild radius (Rs) in addition to the direct imaging around black holes. As a result, (1) Is the primary energy source of Sgr A * and low luminosity AGN accretion disks? Jet? (2) Where is gamma-ray emitting areas in blazers and radio galaxies around black holes? (3) Spatial structure of mass accretion flow at the site near a black hole as the site of energy release? We obtained a lot of findings from the observational approach about the three problems.

Teaching Experience

Seminar I/Research Studies
Toyo University
Research on International Cultures II
Toyo University
Introduction to Natural Science
Toyo University
Astronomy and Practice
Toyo University
Astronomy
Toyo University

Other link

researchmap

https://researchmap.jp/read0125071